CN110776131A - Zero-discharge system and process for regenerated wastewater of condensate fine treatment system of coal-fired power plant - Google Patents
Zero-discharge system and process for regenerated wastewater of condensate fine treatment system of coal-fired power plant Download PDFInfo
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- CN110776131A CN110776131A CN201910979816.6A CN201910979816A CN110776131A CN 110776131 A CN110776131 A CN 110776131A CN 201910979816 A CN201910979816 A CN 201910979816A CN 110776131 A CN110776131 A CN 110776131A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
- B01J49/50—Regeneration or reactivation of ion-exchangers; Apparatus therefor characterised by the regeneration reagents
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
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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
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- 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
- C02F2001/427—Treatment of water, waste water, or sewage by ion-exchange using mixed beds
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention discloses a zero-discharge system and a zero-discharge process for regenerated wastewater of a condensate polishing system of a coal-fired power plant, which are suitable for a unit for regenerating a high-speed mixed bed of the condensate polishing system by using hydrochloric acid and sodium hydroxide. The invention changes the hydrochloric acid regenerated by the high-speed mixing bed of the condensate fine treatment system into sulfuric acid, and is matched with corresponding equipment such as a sulfuric acid storage tank, a sulfuric acid metering pump, a medicine mixer, an acidimeter, a regeneration pump, a neutralization tank, a neutralization water pump, an acid-base medicine adding device and the like, so that the regenerated wastewater is changed into wastewater with high sulfate radical content, the acid-base wastewater is collected in a centralized manner and then is conveyed to a desulfurization system for recycling by the pump, and the sulfate radical in the wastewater can be converted into gypsum by utilizing the self characteristics of the desulfurization system, thereby achieving the aim of zero discharge of the regenerated wastewater.
Description
Technical Field
The invention relates to a zero discharge system and a zero discharge process for regenerated wastewater of a condensate polishing system of a coal-fired power plant.
Background
At present, most of condensate fine treatment systems of coal-fired power plants adopt a high-speed mixed bed process, after the high-speed mixed bed fails, resin is conveyed to a resin separation tower through a resin conveying pipe, anion and cation resin are separated through the separation tower, and the anion and cation resin are independently regenerated. The cation resin is regenerated by hydrochloric acid, the anion resin is regenerated by sodium hydroxide, and the regenerated wastewater is discharged into a neutralization tank for treatment. The cation resin is regenerated by hydrochloric acid, so that the regenerated wastewater can only be reused in a coal yard spraying and wet slag system due to high chloride ion content, and the reuse is incomplete. With the increase of the coal yard closure and the gradual decrease of a wet slag system, the acid-base wastewater is difficult to be absorbed in a plant, and the acid-base wastewater and the desulfurization wastewater are mixed and then further treated in many power plants, so that the treatment cost is very high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a system and a process for zero discharge of regenerated wastewater of a condensate polishing system of a coal-fired power plant.
The technical scheme adopted by the invention for solving the problems is as follows: a zero discharge system for regenerated wastewater of a condensate polishing system of a coal-fired power plant comprises a positive resin recovery tank, a negative resin recovery tank, a spherical high-speed mixed bed and a resin separation tower, wherein the spherical high-speed mixed bed is communicated with the resin separation tower through a resin conveying pipe, and the resin separation tower is respectively communicated with the positive resin recovery tank and the negative resin recovery tank; the device is characterized by further comprising a sulfuric acid storage tank, a sodium hydroxide storage tank, a second chemical mixer, a first chemical mixer and a neutralization pond, wherein the sulfuric acid storage tank is communicated with the first chemical mixer through an acid conveying pipeline, a sulfuric acid metering pump and an automatic valve I are mounted on the acid conveying pipeline, the first chemical mixer is connected with a first demineralized water conveying pipeline, a first regenerating water pump is mounted on the first demineralized water conveying pipeline, and the first chemical mixer is communicated with a cation resin recovery tank through an acid liquid conveying pipeline; the sodium hydroxide storage tank is communicated with a second chemical mixer through an alkali conveying pipeline, a sodium hydroxide metering pump and an automatic valve II are installed on the alkali conveying pipeline, the second chemical mixer is connected with a second demineralized water conveying pipeline, a second regeneration water pump is installed on the second demineralized water conveying pipeline, and the second chemical mixer is communicated with the anion resin recovery tank through an alkali liquor conveying pipeline; the positive resin recovery tank and the negative resin recovery tank are communicated with a neutralization tank, a pH meter II and a liquid level meter are installed in the neutralization tank, and the neutralization tank is communicated to a desulfurization system.
Further, a pH meter I is installed on the acid liquor conveying pipeline, and a pH meter III is installed on the alkali liquor conveying pipeline.
Further, the neutralization tank is connected with an acid-base dosing device, and a neutralization water pump is arranged between the neutralization tank and the desulfurization system.
Furthermore, the invention is suitable for a machine set which adopts hydrochloric acid and sodium hydroxide for regeneration of the high-speed mixed bed of the condensate polishing system.
Furthermore, the method can avoid the generation of acid-base wastewater with very high chloride ion content.
Furthermore, the invention collects the acid-base wastewater mainly containing sulfate ions, recycles the acid-base wastewater to the desulfurization system, and converts the sulfuric acid in the acid-base wastewater into gypsum by utilizing the characteristics of the desulfurization system, thereby achieving the purpose of zero discharge of the acid-base wastewater.
A zero discharge process of regenerated wastewater of a condensate polishing system of a coal-fired power plant is characterized in that the zero discharge system of the regenerated wastewater of the condensate polishing system of the coal-fired power plant is used; the process is as follows:
1) opening the automatic valve I, starting a sulfuric acid metering pump and a first regeneration water pump, mixing the effluent of the first regeneration water pump and sulfuric acid in the first chemical mixer, and then conveying the mixture to a cation resin recovery tank to regenerate cation resin;
2) opening the automatic valve II, starting the sodium hydroxide metering pump and the regenerated water pump II, mixing the water discharged by the regenerated water pump II and the sodium hydroxide in the medicine mixer II, and conveying the mixed water to the anion resin recovery tank to regenerate the anion resin;
3) discharging the regenerated wastewater of the positive resin recovery tank and the regenerated wastewater of the negative resin recovery tank into a neutralization pond;
4) adding acid and/or alkali into the neutralization tank by an acid and alkali dosing device until the pH value reaches neutrality;
5) and the neutralization water pump is controlled according to the liquid level, and is started when the liquid level reaches the upper limit, so that the regenerated wastewater in the neutralization tank is conveyed to the desulfurization system.
Compared with the prior art, the invention has the following advantages and effects: the invention reasonably utilizes the characteristic that the high-speed mixed bed can be regenerated by sulfuric acid, changes the original hydrochloric acid regeneration into sulfuric acid regeneration, and designs related process equipment in a matching way, so that the generated regenerated wastewater is changed into wastewater with high sulfate ion content from the original wastewater with high chloride ion content. Collect regeneration waste water through the neutralization pond to carry out pH regulation to waste water through acid-base charge device, when treating pH to be neutral, carry regeneration waste water to desulfurization system through the neutralization water pump and multiplex, utilize the characteristics of desulfurization system self, can turn into the gypsum with the sulfate radical in the waste water, reach the purpose of regeneration waste water zero release.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: the device comprises a sulfuric acid storage tank 1, an automatic valve I2, an automatic valve II 3, a pH meter I4, a pH meter II 5, a pH meter III 6, a sulfuric acid metering pump 7, a regenerated water pump I8, a cation resin recovery tank 9, a neutralization pond 10, a neutralization water pump 11, a liquid level meter 12, a sodium hydroxide storage tank 13, a sodium hydroxide metering pump 14, a regenerated water pump II 15, a medicine mixer II 16, a medicine mixer I17, a anion resin recovery tank 18, a spherical high-speed mixing bed 19 and a resin separation tower 20.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
Referring to fig. 1, the zero discharge system for regenerated wastewater of the condensate polishing system of the coal-fired power plant in the embodiment comprises a positive resin recovery tank 9, a negative resin recovery tank 18, a spherical high-speed mixing bed 19, a resin separation tower 20, a sulfuric acid storage tank 1, a sodium hydroxide storage tank 13, a second chemical mixer 16, a first chemical mixer 17 and a neutralization pond 10, wherein the spherical high-speed mixing bed 19 is communicated with the resin separation tower 20 through a resin delivery pipe, the resin separation tower 20 is respectively communicated with the positive resin recovery tank 9 and the negative resin recovery tank 18, the sulfuric acid storage tank 1 is communicated with the first chemical mixer 17 through an acid delivery pipe, a sulfuric acid metering pump 7 and an automatic valve I2 are arranged on the acid conveying pipeline, a first chemical mixer 17 is connected with a first demineralized water conveying pipeline, a first regeneration water pump 8 is arranged on the first demineralized water conveying pipeline, and a first medicine mixer 17 is communicated with a cation resin recovery tank 9 through an acid liquid conveying pipeline; the sodium hydroxide storage tank 13 is communicated with a second chemical mixer 16 through an alkali conveying pipeline, a sodium hydroxide metering pump 14 and an automatic valve II 3 are installed on the alkali conveying pipeline, the second chemical mixer 16 is connected with a second demineralized water conveying pipeline, a second regeneration water pump 15 is installed on the second demineralized water conveying pipeline, and the second chemical mixer 16 is communicated with a second anion resin recovery tank 18 through an alkali liquor conveying pipeline; the positive resin recovery tank 9 and the negative resin recovery tank 18 are communicated with the neutralization tank 10, a pH meter II 5 and a liquid level meter 12 are installed in the neutralization tank 10, and the neutralization tank 10 is communicated to a desulfurization system.
In this embodiment, the acid liquor conveying pipeline is provided with a pH meter one 4, and the alkali liquor conveying pipeline is provided with a pH meter three 6.
In this embodiment, the neutralization tank 10 is connected with an acid-base dosing device, and a neutralization water pump 11 is arranged between the neutralization tank 10 and the desulfurization system.
The process for zero discharge of the regeneration wastewater of the condensate polishing system of the coal-fired power plant in the embodiment comprises the following steps:
1) opening the automatic valve I2, starting the sulfuric acid metering pump 7 and the regeneration water pump I8, mixing the water discharged by the regeneration water pump I8 and sulfuric acid in the chemical mixer I17, and then conveying the mixture to the cation resin recovery tank 9 to regenerate the cation resin;
2) opening the second automatic valve 3, starting the sodium hydroxide metering pump 14 and the second regenerated water pump 15, mixing the water discharged from the second regenerated water pump 15 and the sodium hydroxide in the second chemical mixer 16, and then conveying the mixed water and the sodium hydroxide to the anion resin recovery tank 18 to regenerate the anion resin;
3) the regenerated wastewater of the positive resin recovery tank 9 and the regenerated wastewater of the negative resin recovery tank 18 are discharged into a neutralization pond 10;
4) adding acid and/or alkali into the neutralization tank 10 by an acid and alkali dosing device until the pH value reaches neutral;
5) the neutralization water pump 11 is controlled according to the liquid level, and when the liquid level reaches the upper limit, the neutralization water pump 11 is started to convey the regeneration wastewater in the neutralization tank 10 to the desulfurization system.
Example 2.
In a certain coal-fired unit in Hubei, the fine treatment process of condensed water is a pre-filter → a high-speed mixed bed → a low-pressure heater, the system is regenerated by adopting hydrochloric acid and sodium hydroxide all the time, the regenerated wastewater is about 4t/h, the content of chloride ions is about 8000mg/L, and the annual operating hours of the power plant are 4600. Because the plant has been subjected to closed reconstruction of a coal yard, dry slag is adopted in a slag system, all fly ash is sold, and the regenerated wastewater is reused and consumed everywhere and can only be mixed with the desulfurization wastewater and then enters a tail end wastewater treatment system for treatment. Because the quality of the regeneration wastewater and the desulfurization wastewater is poor, the investment of the tail end wastewater treatment system is high, and the running cost is high. The investment of the terminal wastewater treatment system per ton of water is about 300 ten-thousand yuan, and the operation cost for treating one ton of water is about 30 yuan.
After the technical transformation of the invention, the high-speed mixed bed of the condensate polishing system is replaced by sulfuric acid regeneration, the neutralization tank is transformed to be old, and a pipeline from the neutralization tank to the desulfurization system is newly laid. And the regenerated wastewater is discharged into an established neutralization pond for neutralization adjustment, and then is conveyed to a desulfurization system through a neutralization water pump. At present, a desulfurization system runs normally, and zero emission of regenerated wastewater of a condensate fine treatment system is realized. Reduce the discharge capacity of acid and alkali regeneration wastewater 18400m all the year round
3。
Example 3.
A process flow of a condensate polishing system of a certain coal-fired unit in Shandong is front-mounted filter → high-speed mixed bed → shaft seal heater, hydrochloric acid and sodium hydroxide are used for regeneration all the time, the regeneration wastewater is about 3t/h, the content of chloride ions is about 8000mg/L, and the annual operating hours of the power plant are 5200. Because the plant has been subjected to closed reconstruction of a coal yard, dry slag is adopted in a slag system, all fly ash is sold, and the regenerated wastewater is reused and consumed everywhere and can only be mixed with the desulfurization wastewater and then enters a tail end wastewater treatment system for treatment. Because the quality of the regeneration wastewater and the desulfurization wastewater is poor, the investment of the tail end wastewater treatment system is high, and the running cost is high. The investment of a terminal wastewater treatment system per ton of water is about 300 ten-thousand yuan, and the operation cost for treating one ton of water is about 26 yuan.
After the technical transformation of the invention, the high-speed mixed bed of the condensate polishing system is replaced by sulfuric acid regeneration, the neutralization tank is transformed to be old, the regeneration wastewater is separately collected, and a pipeline from the newly-built neutralization tank to the desulfurization system is newly laid. And (4) discharging the regenerated wastewater into a neutralization tank for neutralization adjustment, and conveying the regenerated wastewater to a desulfurization system through a neutralization water pump. At present, a desulfurization system runs normally, and zero emission of regenerated wastewater of a condensate fine treatment system is realized. The discharge amount of acid and alkali regeneration wastewater is reduced by about 15600m all the year round
3。
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and modifications made by those skilled in the art without departing from the spirit and scope of the present invention are also within the scope of the present invention.
Claims (4)
1. A zero discharge system of regenerated wastewater of a condensate polishing system of a coal-fired power plant comprises a positive resin recovery tank (9), a negative resin recovery tank (18), a spherical high-speed mixed bed (19) and a resin separation tower (20), wherein the spherical high-speed mixed bed (19) is communicated with the resin separation tower (20) through a resin conveying pipe, and the resin separation tower (20) is respectively communicated with the positive resin recovery tank (9) and the negative resin recovery tank (18); the device is characterized by further comprising a sulfuric acid storage tank (1), a sodium hydroxide storage tank (13), a second chemical mixer (16), a first chemical mixer (17) and a neutralization pond (10), wherein the sulfuric acid storage tank (1) is communicated with the first chemical mixer (17) through an acid conveying pipeline, a sulfuric acid metering pump (7) and an automatic valve (2) are mounted on the acid conveying pipeline, the first chemical mixer (17) is connected with a first demineralized water conveying pipeline, a first regeneration water pump (8) is mounted on the first demineralized water conveying pipeline, and the first chemical mixer (17) is communicated with a cation resin resuscitation tank (9) through an acid conveying pipeline; the sodium hydroxide storage tank (13) is communicated with a second chemical mixer (16) through an alkali conveying pipeline, a sodium hydroxide metering pump (14) and an automatic valve II (3) are installed on the alkali conveying pipeline, the second chemical mixer (16) is connected with a second demineralized water conveying pipeline, a second regeneration water pump (15) is installed on the second demineralized water conveying pipeline, and the second chemical mixer (16) is communicated with a second anion resin recovery tank (18) through an alkali liquor conveying pipeline; the positive resin recovery tank (9) and the negative resin recovery tank (18) are communicated with a neutralization tank (10), a pH meter II (5) and a liquid level meter (12) are installed in the neutralization tank (10), and the neutralization tank (10) is communicated to a desulfurization system.
2. The coal-fired power plant condensate polishing system regeneration wastewater zero discharge system of claim 1, wherein the acid liquor delivery pipe is provided with a pH meter I (4), and the alkali liquor delivery pipe is provided with a pH meter III (6).
3. The coal-fired power plant condensed water fine treatment system regeneration wastewater zero discharge system as claimed in claim 1, characterized in that the neutralization tank (10) is connected with an acid-base dosing device, and a neutralization water pump (11) is arranged between the neutralization tank (10) and the desulfurization system.
4. A zero discharge process of regenerated wastewater of a condensate polishing system of a coal-fired power plant is characterized in that the zero discharge system of the regenerated wastewater of the condensate polishing system of the coal-fired power plant according to any one of claims 1 to 3 is used; the process is as follows:
1) opening the automatic valve I (2), starting the sulfuric acid metering pump (7) and the regenerated water pump I (8), mixing the effluent of the regenerated water pump I (8) and sulfuric acid in the chemical mixer I (17), and then conveying the mixture to the cation resin recovery tank (9) to regenerate the cation resin;
2) opening the automatic valve II (3), starting the sodium hydroxide metering pump (14) and the regenerated water pump II (15), mixing the water discharged from the regenerated water pump II (15) and the sodium hydroxide in the medicine mixer II (16), and then conveying the mixed water and the sodium hydroxide to the anion resin recovery tank (18) to regenerate the anion resin;
3) the regenerated wastewater of the positive resin recovery tank (9) and the regenerated wastewater of the negative resin recovery tank (18) are discharged into the neutralization tank (10);
4) an acid and alkali dosing device adds acid and/or alkali into the neutralization tank (10) until the pH value reaches neutrality;
5) and the neutralization water pump (11) is controlled according to the liquid level, and when the liquid level reaches the upper limit, the neutralization water pump (11) is started to convey the regeneration wastewater in the neutralization tank (10) to the desulfurization system.
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| CN201910979816.6A CN110776131A (en) | 2019-10-15 | 2019-10-15 | Zero-discharge system and process for regenerated wastewater of condensate fine treatment system of coal-fired power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112919607A (en) * | 2021-01-26 | 2021-06-08 | 华能国际电力股份有限公司日照电厂 | Method for adjusting pH value of wastewater |
| CN113896358A (en) * | 2021-11-19 | 2022-01-07 | 华能武汉发电有限责任公司 | High-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration chlorine reduction |
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2019
- 2019-10-15 CN CN201910979816.6A patent/CN110776131A/en active Pending
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| JPH04371239A (en) * | 1991-06-20 | 1992-12-24 | Japan Organo Co Ltd | Method for regenerating cation-exchanger resin in condensate desalter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112919607A (en) * | 2021-01-26 | 2021-06-08 | 华能国际电力股份有限公司日照电厂 | Method for adjusting pH value of wastewater |
| CN113896358A (en) * | 2021-11-19 | 2022-01-07 | 华能武汉发电有限责任公司 | High-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration chlorine reduction |
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