CN211595257U - Zero discharge device of regeneration wastewater of boiler make-up water treatment system of coal-fired power plant - Google Patents
Zero discharge device of regeneration wastewater of boiler make-up water treatment system of coal-fired power plant Download PDFInfo
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- CN211595257U CN211595257U CN201921726955.XU CN201921726955U CN211595257U CN 211595257 U CN211595257 U CN 211595257U CN 201921726955 U CN201921726955 U CN 201921726955U CN 211595257 U CN211595257 U CN 211595257U
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Abstract
The utility model discloses a coal fired power plant boiler make-up water processing system regeneration waste water zero discharge apparatus, change the regenerated hydrochloric acid of boiler make-up water workshop ion exchanger into sulphuric acid, supporting corresponding sulphuric acid storage tank, the sulphuric acid batch meter, the sprayer, the acidimeter, the regenerative pump, in with the pond, equipment such as neutralization water pump, make regeneration waste water become the waste water that contains the sulfate radical height, concentrate the acid and alkali waste water and collect the back, convey to the recycling of desulfurization system with the 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.
Description
Technical Field
The utility model relates to a zero discharge device of regeneration wastewater of a boiler make-up water 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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a coal fired power plant boiler feedwater treatment system regeneration waste water zero discharge device.
The utility model provides a technical scheme that above-mentioned problem adopted is: 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 utility model, have following advantage and effect: the utility model discloses reform transform boiler feedwater processing system's ion exchanger regenerating unit, change original hydrochloric acid regeneration into sulphuric acid regeneration, supporting corresponding sulphuric acid storage tank, the sulphuric acid batch meter, the sprayer, the acidimeter, the regenerative pump, neutralization pond, equipment such as neutralization water pump, make regeneration waste water become the waste water that contains the sulfate root height, concentrate the acid and alkali waste water and collect the back, convey to the desulfurization system retrieval and utilization with the 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 by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Example 1.
Referring to fig. 1, in the embodiment, the zero discharge apparatus of the regenerated wastewater of the boiler feedwater treatment system in the coal-fired power plant includes 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, 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 two 3 is installed 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 one 2 is installed on a pipeline between the sulfuric acid metering tank 6 and the acid ejector 7, a regeneration water pump 8 is installed 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 one 4 is installed 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, 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.
The process comprises the following steps of transforming an ion exchanger regenerating device of a boiler make-up water treatment system, and changing the original regeneration of hydrochloric acid and sodium hydroxide into the regeneration of sulfuric acid and sodium hydroxide; 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.
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 utility model discloses the technological transformation back, boiler make-up water cation exchanger and mixed ion exchanger all change for sulphuric acid regeneration, and the neutralization pond is used up, has laid the pipeline of neutralization pond to desulfurization system newly. 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 round3。
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.
Through the utility model discloses technical transformation back, boiler make-up water cation exchanger and mixed ion exchanger all change for sulphuric acid regeneration, have newly built the neutralization pond, collect regeneration waste water alone, and the neutralization pond that has built only collects filter backwash water. And newly laying a pipeline from the newly-built neutralization tank to the desulfurization system. The regenerated wastewater is discharged into an established neutralization tank 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 round3。
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as being included in the following claims.
Claims (1)
1. 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 (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 the 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921726955.XU CN211595257U (en) | 2019-10-15 | 2019-10-15 | Zero discharge device of regeneration wastewater of boiler make-up water treatment system of coal-fired power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921726955.XU CN211595257U (en) | 2019-10-15 | 2019-10-15 | Zero discharge device of regeneration wastewater of boiler make-up water treatment system of coal-fired power plant |
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