CN110776132A - Zero-discharge process and device for regenerated wastewater of boiler make-up water treatment system of coal-fired power plant - Google Patents
Zero-discharge process and device for regenerated wastewater of boiler make-up water treatment system of coal-fired power plant Download PDFInfo
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- CN110776132A CN110776132A CN201910980371.3A CN201910980371A CN110776132A CN 110776132 A CN110776132 A CN 110776132A CN 201910980371 A CN201910980371 A CN 201910980371A CN 110776132 A CN110776132 A CN 110776132A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 58
- 230000008929 regeneration Effects 0.000 claims abstract description 39
- 238000011069 regeneration method Methods 0.000 claims abstract description 39
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 27
- 230000023556 desulfurization Effects 0.000 claims abstract description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 150000002500 ions Chemical class 0.000 claims abstract description 13
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 5
- 239000010440 gypsum Substances 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims description 45
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 150000001768 cations Chemical class 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract 1
- 239000002585 base Substances 0.000 description 15
- 239000002893 slag Substances 0.000 description 6
- 238000004065 wastewater treatment Methods 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007131 hydrochloric acid regeneration reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a process and a device for zero discharge of regenerated wastewater of a boiler feedwater treatment system of a coal-fired power plant, which change hydrochloric acid regenerated by an ion exchanger of a boiler feedwater workshop into sulfuric acid, and are matched with corresponding sulfuric acid storage tanks, sulfuric acid metering tanks, ejectors, acidimeters, regeneration pumps, neutralization pools, neutralization water pumps and other equipment, 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 conveyed to a desulfurization system for recycling by the pumps, and the sulfate radical in the wastewater is converted into gypsum by utilizing the characteristics of the desulfurization system, thereby achieving the purpose of zero discharge of the regenerated wastewater.
Description
Technical Field
The invention relates to a process and a device for zero discharge of regenerated wastewater of a boiler feedwater treatment system of a coal-fired power plant.
Background
At present, hydrochloric acid and sodium hydroxide are adopted for regenerating ion exchangers in boiler make-up water workshops of most coal-fired power plants, and acid-base wastewater generated after regeneration can only be reused in coal yard spraying and wet slag systems due to high chloride ion content, and the reuse is incomplete. With the increase of coal yard closure and the gradual decrease of wet slag systems, the acid-base wastewater is difficult to be absorbed in a plant, and many power plants mix the acid-base wastewater with the desulfurization wastewater for further treatment, so that the treatment cost is very high, and the investment of each ton of water treatment is about 300 ten thousand yuan.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a process and a device for zero discharge of regenerated wastewater of a boiler feedwater treatment system of a coal-fired power plant.
The technical scheme adopted by the invention for solving the problems is as follows: a coal-fired power plant boiler make-up water treatment system regeneration waste water zero discharge process, its characteristic is, reform transform the ion exchanger regenerating unit of the boiler make-up water treatment system, change original hydrochloric acid, sodium hydroxide regeneration into sulfuric acid, sodium hydroxide regeneration; the method comprises the following steps of (1) intensively collecting acid-base wastewater mainly containing sulfate ions, adjusting pH, conveying the acid-base wastewater to a desulfurization system for reuse, and converting sulfuric acid in the acid-base wastewater into gypsum by using the desulfurization system to achieve the aim of zero discharge of the acid-base wastewater; the process flow is as follows:
and 5, controlling the start of the neutralization water pump according to the liquid level of the neutralization tank, starting the neutralization water pump when the liquid level reaches the upper limit, and conveying the regenerated wastewater in the neutralization tank to a desulfurization system.
Furthermore, the process is suitable for a unit which regenerates an ion exchanger of a boiler feedwater treatment system by adopting hydrochloric acid and sodium hydroxide.
A zero discharge device of regenerated wastewater of a boiler feedwater treatment system of a coal-fired power plant is characterized by comprising a sulfuric acid storage tank, a sulfuric acid metering tank, an acid ejector, a cation exchanger and a neutralization pond, wherein an acid outlet of the sulfuric acid storage tank is connected with an acid inlet of the sulfuric acid metering tank, an automatic valve II is arranged on a pipeline between the sulfuric acid storage tank and the sulfuric acid metering tank, an acid outlet of the sulfuric acid metering tank is connected with an acid inlet of the acid ejector, an automatic valve I is arranged on a pipeline between the sulfuric acid metering tank and the acid ejector, a regeneration water pump is arranged on a water inlet pipeline of the acid ejector, a water outlet of the acid ejector is connected with a water inlet of the cation exchanger, a pH meter I is arranged on a pipeline between the acid ejector and the cation exchanger, a water outlet of the cation exchanger is connected with a water inlet of the neutralization pond, and the neutralization pond is connected with a chemical-adding acid, and a pH meter II and a liquid level meter are arranged in the neutralization tank, a water outlet of the neutralization tank is communicated with the desulfurization system, and a neutralization water pump is arranged on a water outlet pipeline of the neutralization tank.
Compared with the prior art, the invention has the following advantages and effects: the invention reasonably utilizes the characteristic that the ion exchanger can be regenerated by sulfuric acid, changes the original hydrochloric acid regeneration into sulfuric acid regeneration, and changes the generated regeneration wastewater from the original wastewater with high chloride ion content into the wastewater with high sulfate 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 multiplexing through neutralization water pump, utilize the characteristics of desulfurization system self, 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.
FIG. 1: 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 sulfuric acid metering tank 6, an acid ejector 7, a regeneration water pump 8, a cation exchanger 9, a neutralization tank 10, a neutralization water pump 11, a liquid level meter 12 and an acid-base dosing device 13.
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, in the zero discharge process of the regeneration wastewater of the boiler feedwater treatment system of the coal-fired power plant in the embodiment, an ion exchanger regeneration device of the boiler feedwater treatment system is modified, and the original hydrochloric acid and sodium hydroxide regeneration is changed into sulfuric acid and sodium hydroxide regeneration; the method comprises the following steps of (1) intensively collecting acid-base wastewater mainly containing sulfate ions, adjusting pH, conveying the acid-base wastewater to a desulfurization system for reuse, and converting sulfuric acid in the acid-base wastewater into gypsum by using the desulfurization system to achieve the aim of zero discharge of the acid-base wastewater; the process flow is as follows:
and 5, controlling the start of the neutralization water pump 11 according to the liquid level of the neutralization tank 10, starting the neutralization water pump 11 when the liquid level reaches the upper limit, and conveying the regenerated wastewater in the neutralization tank 10 to a desulfurization system.
The process is suitable for a unit which regenerates an ion exchanger of a boiler make-up water treatment system by adopting hydrochloric acid and sodium hydroxide.
In the embodiment, the zero discharge device of the regenerated wastewater of the boiler feedwater treatment system of the coal-fired power plant comprises a sulfuric acid storage tank 1, a sulfuric acid metering tank 6, an acid ejector 7, a cation exchanger 9 and a neutralization tank 10, wherein an acid outlet of the sulfuric acid storage tank 1 is connected with an acid inlet of the sulfuric acid metering tank 6, an automatic valve II 3 is arranged on a pipeline between the sulfuric acid storage tank 1 and the sulfuric acid metering tank 6, an acid outlet of the sulfuric acid metering tank 6 is connected with an acid inlet of the acid ejector 7, an automatic valve I2 is arranged on a pipeline between the sulfuric acid metering tank 6 and the acid ejector 7, a regeneration water pump 8 is arranged on a water inlet pipeline of the acid ejector 7, a water outlet of the acid ejector 7 is connected with a water inlet of the cation exchanger 9, a pH meter I4 is arranged on a pipeline between the acid ejector 7 and the cation exchanger 9, a water outlet of the cation exchanger 9 is connected with a water, the neutralization tank 10 is connected with an acid-base dosing device 13, a pH meter II 5 and a liquid level meter 12 are arranged in the neutralization tank 10, a water outlet of the neutralization tank 10 is communicated with a desulfurization system, and a neutralization water pump 11 is arranged on a water outlet pipeline of the neutralization tank 10.
Example 2.
In a certain coal-fired unit in Hubei, the flow of a boiler feedwater treatment system is a filter → a cation exchanger → an anion exchanger → a mixed ion exchanger, hydrochloric acid and sodium hydroxide are used for regeneration all the time, the regeneration wastewater is about 3t/h, wherein 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 technology of the invention is reformed, the boiler make-up water cation exchanger and the mixed ion exchanger are both replaced by sulfuric acid for regeneration, the neutralization tank is used for the sake of good use, and a pipeline from the neutralization tank to a 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 normally operates, and zero discharge of boiler make-up water regeneration wastewater is realized. 13800m for reducing discharge capacity of acid-base regeneration wastewater all year round
3。
Example 3.
The coal-fired unit in Shandong has boiler feed water treating system comprising double medium filter → cation exchanger → anion exchanger → mixed ion exchanger, and is regenerated with hydrochloric acid and sodium hydroxide to regenerate waste water of about 1.6t/h, chlorine ion content of about 7000mg/L and annual running hour number of 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 technology of the invention is improved, the boiler make-up water cation exchanger and the mixed ion exchanger are both replaced by sulfuric acid for regeneration, a neutralization tank is newly built, the regeneration wastewater is separately collected, and the constructed neutralization tank only collects the backwashing water of the filter. And newly laying a pipeline from the newly-built neutralization tank to the desulfurization system. 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 normally operates, and zero discharge of boiler make-up water regeneration wastewater is realized. The discharge capacity of acid and alkali regeneration wastewater is reduced by about 8230m 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 (3)
1. A coal-fired power plant boiler make-up water treatment system regeneration waste water zero discharge process, its characteristic is, reform transform the ion exchanger regenerating unit of the boiler make-up water treatment system, change original hydrochloric acid, sodium hydroxide regeneration into sulfuric acid, sodium hydroxide regeneration; the method comprises the following steps of (1) intensively collecting acid-base wastewater mainly containing sulfate ions, adjusting pH, conveying the acid-base wastewater to a desulfurization system for reuse, and converting sulfuric acid in the acid-base wastewater into gypsum by using the desulfurization system to achieve the aim of zero discharge of the acid-base wastewater; the process flow is as follows:
step 1, opening an automatic valve II (3), automatically replenishing concentrated sulfuric acid in a sulfuric acid storage tank (1) into a sulfuric acid metering tank (6), and closing the automatic valve II (3) when the concentrated sulfuric acid reaches the upper limit of a liquid level;
step 2, starting a regeneration water pump (8), starting the automatic valve I (2), sucking out concentrated sulfuric acid in the sulfuric acid metering tank (6) by an acid ejector (7), and conveying the concentrated sulfuric acid with a certain concentration to a cation exchanger (9) through the acid ejector (7) for replacement regeneration;
step 3, discharging the regenerated wastewater in the cation exchanger (9) into a neutralization tank (10);
step 4, adding acid and base into the neutralization tank (10) by an acid and base dosing device (13) until the pH value of the regeneration wastewater in the neutralization tank (10) reaches neutral;
and 5, controlling the start of the neutralization water pump (11) according to the liquid level of the neutralization tank (10), and starting the neutralization water pump (11) when the liquid level reaches the upper limit so as to convey the regenerated wastewater in the neutralization tank (10) to a desulfurization system.
2. The coal-fired power plant boiler makeup water treatment system regeneration wastewater zero discharge process according to claim 1, characterized in that the process is applied to a unit for regenerating an ion exchanger of a boiler makeup water treatment system by using hydrochloric acid and sodium hydroxide.
3. The device in the zero discharge process of the regenerated wastewater of the boiler feedwater treatment system of the coal-fired power plant as claimed in claim 1 or 2, which is characterized by comprising a sulfuric acid storage tank (1), a sulfuric acid metering tank (6), an acid ejector (7), a cation exchanger (9) and a neutralization pond (10), wherein an acid outlet of the sulfuric acid storage tank (1) is connected with an acid inlet of the sulfuric acid metering tank (6), an automatic valve II (3) is arranged on a pipeline between the sulfuric acid storage tank (1) and the sulfuric acid metering tank (6), an acid outlet of the sulfuric acid metering tank (6) is connected with an acid inlet of the acid ejector (7), an automatic valve I (2) is arranged on a pipeline between the sulfuric acid metering tank (6) and the acid ejector (7), a regenerated water pump (8) is arranged on a water inlet pipeline of the acid ejector (7), a water outlet of the acid ejector (7) is connected with a water inlet of the cation exchanger (9), and install pH meter (4) on the pipeline between acid ejector (7) and cation exchanger (9), the delivery port and the water inlet of neutralization pond (10) of cation exchanger (9) are connected, neutralization pond (10) are connected with acid-base charge device (13), and are provided with pH meter two (5) and level gauge (12) in neutralization pond (10), the delivery port and the desulfurization system intercommunication of neutralization pond (10), and install neutralization water pump (11) on the play water pipeline of neutralization pond (10).
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| CN201910980371.3A CN110776132A (en) | 2019-10-15 | 2019-10-15 | Zero-discharge process and device for regenerated wastewater of boiler make-up water treatment system of coal-fired power plant |
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| CN201910980371.3A CN110776132A (en) | 2019-10-15 | 2019-10-15 | Zero-discharge process and device for regenerated wastewater of boiler make-up water treatment system of coal-fired power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 CN201910980371.3A patent/CN110776132A/en active Pending
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| CN1184712A (en) * | 1997-05-27 | 1998-06-17 | 四川康达建材工业(集团)公司 | Method for treating resin using sulfuric acid as regenerating agent |
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| JP2008006409A (en) * | 2006-06-30 | 2008-01-17 | Agc Engineering Co Ltd | Method for regenerating exhaust gas absorbed solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Application publication date: 20200211 |