CN212198888U - Desulfurization waste water concentration decrement device based on film evaporation technique - Google Patents
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- CN212198888U CN212198888U CN202020505437.1U CN202020505437U CN212198888U CN 212198888 U CN212198888 U CN 212198888U CN 202020505437 U CN202020505437 U CN 202020505437U CN 212198888 U CN212198888 U CN 212198888U
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Abstract
The utility model relates to a desulfurization waste water concentration and reduction device based on a film evaporation technology, which comprises a tubular microfiltration module, a nanofiltration module and a high molecular film evaporation module; the tubular microfiltration module include concentrated water tank of microfiltration, the former water tank of microfiltration, the microfiltration circulating pump, the microfiltration membrane group, the water tank is produced in the microfiltration and the sludge pump, the former water tank of triplex case export desulfurization waste water gets into the former water tank of microfiltration, the former water tank export of microfiltration is connected with the inlet of microfiltration circulating pump, the outlet of microfiltration circulating pump is connected with the inlet of microfiltration membrane group, the water end is produced with the microfiltration to the microfiltration membrane group and the water tank import is connected, the concentrated water of microfiltration is connected with the concentrated water tank of microfiltration. The utility model has the advantages that: the device is provided with the tubular microfiltration module, the nanofiltration module and the high molecular film evaporation module, and provides a set of desulfurization wastewater concentration and reduction technical scheme which does not produce sludge, does not add drugs and has low operation cost by combining various treatment processes such as microfiltration, nanofiltration, film evaporation and concentration and the like.
Description
Technical Field
The utility model discloses can be used to the concentrated decrement of desulfurization waste water of power plant belongs to the waste water treatment field of power plant, concretely relates to concentrated decrement device of desulfurization waste water based on film evaporation technique.
Background
Discharge from State Council in 2015 "action plan for Water pollution control" (i.e. "Ten Water"). Industrial wastewater discharge will enter a strong regulatory scope. In recent years, coal-fired power plants have been subjected to flue gas ultra-low emission reformation on a large scale, wherein desulfurization wastewater is generated in the process of flue gas desulfurization by a limestone wet method. The desulfurization waste water has complex components, large water quality change, great harm and difficult treatment, and becomes the key point of pollution control of coal-fired power plants. The water quality characteristics of the desulfurization wastewater mainly comprise: PH valueThe value is 4-6.5, and the acid is formed; the content of suspended matters is high, and is generally between 10000 and 15000 mg/L; contains trace mercury, lead, chromium and other heavy metal ions and arsenic, selenium, cyanide and other pollutants; contains a large amount of Ca2+、Mg2+Cation and Cl-、HS03 -、HC03 -Plasma, Total Dissolved Solids (TDS) -typically 25000-60000 mg/L, with chloride ion content typically 20000-30000 mg/L. Therefore, the desulfurization wastewater has the characteristics of high salt content, high hardness and high chloride ion, and has stronger corrosivity and scaling property.
At present, the common desulfurization wastewater treatment process of thermal power plants at home and abroad adopts a chemical precipitation method (mainly triple box treatment). Part of indexes are difficult to reach the standard, even after the standard treatment, the salt content of the effluent is still as high as 2% -4% due to the existence of a large amount of sulfate and chloride in the wastewater, the effluent is difficult to be recycled, and surface water and soil ecology damage can be caused after the effluent is discharged, so that secondary pollution is caused.
With the stricter and stricter restriction on the pollutant discharge of coal-fired power generating sets and the continuous shortage of fresh water resources by national environmental protection policies, the zero discharge of desulfurization wastewater is promoted. And in order to realize the zero discharge of the wastewater of the whole plant, evaporation treatment is required, and the mainstream technology is to separate the desulfurization wastewater into steam and solid waste through a bypass flue evaporation or evaporation crystallization device. If all the desulfurization waste water is evaporated, the problem of high operation cost is inevitably caused. Therefore, the desulfurization wastewater needs to be subjected to reduction treatment, so that the treatment cost of subsequent evaporation and solidification is reduced.
The main process for desulfurization wastewater decrement treatment adopts a membrane method and a thermal method, wherein the membrane method generally adopts a reverse osmosis method, and the thermal method adopts an evaporation process. Because the desulfurization wastewater has high salt content and is rich in scaling substances, concentration and decrement are carried out by adopting reverse osmosis, firstly, a double-alkali method is adopted for softening, the operation cost is increased, the recovery rate of the system is about 50 percent generally, the operation pressure is high, the service life of the membrane is tested, and the maintenance cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects in the prior art and providing a desulfurization waste water concentration and reduction device based on the film evaporation technology.
The desulfurization wastewater concentration and decrement device based on the thin film evaporation technology comprises a tubular microfiltration module, a nanofiltration module and a high molecular thin film evaporation module; the tubular microfiltration module comprises a microfiltration concentrated water tank, a microfiltration raw water tank, a microfiltration circulating pump, a microfiltration membrane group, a microfiltration product water tank and a sludge discharge pump, wherein the desulfurization wastewater at the outlet of the triple tank enters the microfiltration raw water tank, the outlet of the microfiltration raw water tank is connected with the inlet of the microfiltration circulating pump, the outlet of the microfiltration circulating pump is connected with the inlet of the microfiltration membrane group, the product water end of the microfiltration membrane group is connected with the inlet of the microfiltration product water tank, the microfiltration concentrated water is connected with the microfiltration concentrated water tank, and a drain pipe at the bottom of the microfiltration concentrated water tank is connected with the sludge discharge pump; the nanofiltration module comprises a nanofiltration booster pump, a nanofiltration security filter, a nanofiltration high-pressure pump, a nanofiltration membrane group, a nanofiltration concentrated water tank, a nanofiltration water tank and a nanofiltration concentrated water discharge pump, wherein an outlet of the microfiltration water tank is connected with an inlet of the nanofiltration booster pump, an outlet of the nanofiltration booster pump is connected with an inlet of the nanofiltration security filter, an outlet of the nanofiltration security filter is connected with an inlet of the nanofiltration high-pressure pump, an outlet of the nanofiltration high-pressure pump is connected with an inlet of the nanofiltration membrane group, the nanofiltration water enters the nanofiltration water tank, the nanofiltration concentrated water enters the nanofiltration concentrated water tank, and a water discharge pipe at the bottom of the nanofiltration water tank is connected with the nanofiltration concentrated water discharge pump; the outlet of the nanofiltration water production tank is connected to the high polymer film evaporation module.
Preferably, the method comprises the following steps: the concentrated microfiltration water tank and the raw microfiltration water tank are connected with each other on the same wall, and a gap is reserved between the concentrated microfiltration water tank and the raw microfiltration water tank.
Preferably, the method comprises the following steps: and the nanofiltration concentrated water discharge pump is connected to the desulfurization slurry tank.
Preferably, the method comprises the following steps: the high polymer film evaporation module comprises a lifting pump, a film evaporator, a booster fan, a condensate water tank, a condensate liquid discharge pump, a heat exchanger and a circulating pump; the outlet of the nanofiltration water production tank is connected with the inlet of a lifting pump, the outlet of the lifting pump is connected with the inlet of a heat exchanger, the outlet of the heat exchanger is connected with a spray tray on the upper part of the thin film evaporator, the middle part of the thin film evaporator is connected with a booster fan, the booster fan is connected with a steam pipeline main pipe on the upper part of the spray tray, a condensate water main pipe in the thin film evaporator is connected with a condensate water tank, the bottom of the thin film evaporator is connected with the inlet of a circulating pump.
The utility model has the advantages that:
1. the device is provided with the tubular microfiltration module, the nanofiltration module and the high molecular film evaporation module, and provides a set of desulfurization wastewater concentration and reduction technical scheme which does not produce sludge, does not add drugs and has low operation cost by combining various treatment processes such as microfiltration, nanofiltration, film evaporation and concentration and the like.
2. The technology adopts tubular microfiltration to remove suspended matters in water and clarify water; nanofiltration is adopted to separate divalent ions, so that the water production scaling tendency is reduced; the method adopts the polymer film evaporation to reduce and concentrate the desulfurization wastewater, and has the advantages of difficult scaling and corrosion, easy cleaning and the like.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization wastewater concentration and reduction device based on a thin film evaporation technology;
FIG. 2 is a flow chart of a desulfurization wastewater concentration and reduction process based on a thin film evaporation technology.
Description of reference numerals: the device comprises a microfiltration concentrated water tank 1, a microfiltration raw water tank 2, a microfiltration circulating pump 3, a microfiltration membrane group 4, a microfiltration product water tank 5, a sludge discharge pump 6, a nanofiltration booster pump 7, a nanofiltration cartridge filter 8, a nanofiltration high-pressure pump 9, a nanofiltration membrane group 10, a nanofiltration concentrated water tank 11, a nanofiltration product water tank 12, a nanofiltration concentrated water discharge pump 13, a lift pump 14, a thin film evaporator 15, a booster fan 16, a condensate water tank 17, a condensate discharge pump 18, a heat exchanger 19, a circulating pump 20 and a conductivity meter 21.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Aiming at the characteristics of large desulfurization wastewater treatment capacity, high pollutant content, complex components, strong corrosivity and the like of the coal-fired power plant, the economic and efficient concentration and reduction treatment process is provided for realizing the difficult problem of concentration and reduction of the desulfurization wastewater of the coal-fired power plant, reducing the zero-discharge treatment capacity of the desulfurization wastewater and reducing the operation cost. The treatment scheme of this patent concentration decrement does: the desulfurization waste water is reduced by 75 percent by combining the processes of microfiltration, nanofiltration and high molecular film evaporation concentration. The specific process comprises the following steps: enabling desulfurization wastewater at an outlet of a triple box of a power plant to enter a microfiltration module through a lift pump, and performing cross-flow filtration on the desulfurization wastewater by adopting tubular microfiltration to remove suspended solids and impurities; tubular microfiltration produced water enters a nanofiltration membrane, and dissolved salts or solutes are selectively permeated by the nanofiltration membrane to carry out salt separation treatment so as to intercept sulfate radicals and calcium and magnesium ions; nanofiltration produced water directly enters high-molecular film evaporation equipment, fresh water is produced after evaporation and can be used as make-up water of a desulfurization absorption tower or a circulating water cooling tower, and concentrated water enters a subsequent zero-emission evaporation system. The process scheme combines various processes such as microfiltration, nanofiltration, high-molecular film evaporation and the like, and provides a set of desulfurization wastewater concentration and reduction technical scheme which does not generate sludge, does not add medicine, has low operation cost and high automation control process degree.
The desulfurization wastewater concentration and reduction device based on the thin film evaporation technology performs solid-liquid separation by using microfiltration, performs divalent ion separation by nanofiltration and performs concentration and reduction on the desulfurization wastewater of the power plant by using a high-molecular thin film evaporation process. The device structure includes: the device comprises a tubular microfiltration module, a nanofiltration module and a high molecular film evaporation module.
And the desulfurization wastewater at the outlet of the triple box is conveyed to a microfiltration raw water tank by a lift pump and enters a tubular microfiltration module. The tubular microfiltration module comprises a microfiltration concentrated water tank 1, a microfiltration raw water tank 2, a microfiltration circulating pump 3, a microfiltration membrane group 4, a microfiltration product water tank 5, a sludge discharge pump 6 and other equipment. 2 exports of raw water tank of microfiltration and 3 imports of microfiltration circulating pump are connected, 3 exports of microfiltration circulating pump are connected with 4 imports of microfiltration membrane group, the water end is produced with the microfiltration to the microfiltration membrane group 4 and 5 imports of water tank are connected, the microfiltration dense water is connected with microfiltration concentrated water tank 1, 1 bottom drain pipes of microfiltration concentrated water tank are connected with sludge discharge pump 6, sludge discharge compresses into the mud cake after to the triple box sludge concentration pond amalgamation.
And performing solid-liquid separation through a tubular microfiltration membrane group to remove suspended matters in water.
The microfiltration concentrated water tank 1 and the microfiltration raw water tank 2 are connected with each other, and the middle gap can enable the clear liquid at the upper part of the microfiltration concentrated water tank 1 to overflow into the microfiltration raw water tank 2 and enter the microfiltration membrane group 4 for further concentration so as to reduce the concentrated water amount.
The outlet of the microfiltration product water tank 5 is boosted by the nanofiltration booster pump 7 and then enters the nanofiltration module. The nanofiltration module comprises a nanofiltration booster pump 7, a nanofiltration cartridge filter 8, a nanofiltration high-pressure pump 9, a nanofiltration membrane group 10, a nanofiltration concentrated water tank 11, a nanofiltration water production tank 12, a nanofiltration concentrated water discharge pump 13 and the like. The outlet of the microfiltration water production tank 5 is connected with the inlet of the nanofiltration booster pump 7, the outlet of the nanofiltration booster pump 7 is connected with the inlet of the nanofiltration cartridge filter 8, the outlet of the nanofiltration cartridge filter 8 is connected with the inlet of the nanofiltration high-pressure pump 9, the outlet of the nanofiltration high-pressure pump 9 enters the nanofiltration membrane group 10, the nanofiltration water production enters the nanofiltration water production tank 12, the nanofiltration concentrated water enters the nanofiltration concentrated water tank 11, the drain pipe at the bottom of the nanofiltration concentrated water tank 11 is connected with the nanofiltration concentrated water discharge pump 13, and the water is discharged to the desulfurization slurry tank.
The nanofiltration module is used for separating divalent ions of the desulfurization wastewater, the fresh water mainly contains monovalent ions, the concentrated water is rich in divalent ions, the removal rate of sulfate radicals and calcium and magnesium ions reaches over 95%, and the recovery rate reaches over 80%. The concentrated water returns to the slurry pool of the desulfurizing tower, and the fresh water enters a subsequent film evaporation concentration system.
Nanofiltration produced water enters the high molecular film evaporation module through the lifting pump 14 and the heat exchanger 19. The high polymer film evaporation module comprises equipment such as a lifting pump 14, a film evaporator 15, a booster fan 16, a condensate water tank 17, a condensate discharging pump 18, a heat exchanger 19, a circulating pump 20 and the like. An outlet of the lifting pump 14 is connected with an inlet of a heat exchanger 19, and is connected with a spray disc on the upper portion of the thin film evaporator 15 after passing through the heat exchanger 19, the middle portion of the thin film evaporator 15 is connected with a booster fan 16, the booster fan 16 boosts and heats steam and returns to the upper portion of the thin film evaporator 15 and is connected with a steam pipeline main pipe on the upper portion of the spray disc, a condensate water main pipe inside the thin film evaporator 15 is connected with a condensate water tank 17, the bottom of the thin film evaporator 15 is connected with an inlet of a circulating pump 20.
The film evaporator 15 is a core component of the module, the upper part of the evaporator is provided with a spray disc, the evaporator is divided into an upper part and a lower part, a plurality of film bags are arranged below the spray disc, a steam pipeline main pipe is arranged on the upper part of the spray disc, an upper pipeline of each film bag is connected with the steam pipeline main pipe, a lower pipeline of each film bag is connected with a condensate water main pipe, and the condensate water main pipe is communicated with a condensate water tank 17. The outlet of the bottom of the evaporator is connected with a circulating pump 20, one path of the outlet of the circulating pump 20 is connected with an upper spraying disc, the bottom stock solution is sprayed to the upper spraying disc, and the spraying disc has the function of uniformly spraying the sprayed stock solution to the outer surface of the bag; the other path is discharged to a subsequent wastewater zero-discharge curing system. After the thin film evaporator is concentrated and reduced, the water quantity can be reduced by 1/4, and the subsequent operation cost of zero discharge of wastewater can be greatly reduced.
The film bag is a polymer film bag made of PPS or PAR, and is formed by pressing two polymer films, the interior of the bag is hollow, the upper end and the lower end of the bag are respectively provided with a pipeline which is communicated, tightly connected and leak-proof. The film evaporator has the characteristics of high heat exchange coefficient, full heat exchange, smooth surface and difficult adhesion due to the adoption of the film bag, so that the film evaporator has the characteristics of difficult scaling, corrosion resistance and easy cleaning due to the corrosion resistance of the polymer film.
The outlet of the condensate water tank 17 is connected with the inlet of a condensate water discharge pump 18, the outlet of the condensate water discharge pump 18 is connected with a heat exchanger 19, the stock solution pumped by the lift pump 14 is preheated by utilizing the waste heat of the condensate water, and the condensate water is discharged to the desulfurization water tank for recycling.
And a conductivity meter 21 is arranged at an outlet of the circulating pump 20 and used for controlling the concentration rate (salt content of the concentrated solution) of the stock solution in the evaporator and discharging the stock solution to a subsequent wastewater zero-discharge evaporation system after the concentration rate reaches a certain conductivity of 80000-.
The booster fan 16 is connected with a pipeline led out from the middle of the evaporator, steam generated after stock solution is subjected to heat exchange of the bag is sucked into the booster fan, pressurization and temperature rise are carried out through the booster fan, the working temperature of the evaporator is maintained at 55-60 ℃, micro negative pressure and working pressure are maintained inside the evaporator: -0.85K Pa to-0.75K Pa, temperature difference between the outlet of the booster fan and the interior of the evaporator: 2 to 3 ℃.
The preheating steam is mainly used for preheating the device when the device is started, and after the steam is generated, the steam is mainly recycled by means of the steam.
Temperature sensors and pressure sensors are arranged on the upper portion, the middle portion and the lower portion of the evaporator and used for monitoring the temperature and the pressure inside the evaporator.
The bottom of the evaporator is provided with a water level gauge for monitoring the water level, and the normal heat exchange of the bag can be influenced by the overhigh water level.
The TDS of the waste water concentrated by the thin film evaporator can be controlled to be 20000mg/L-23000 mg/L.
The utility model provides a desulfurization waste water concentration decrement method based on thin film evaporation technology with simple process, good economy and high reliability, which comprises the following steps:
1) and the desulfurization wastewater of the power plant after passing through the triple box enters a desulfurization wastewater collecting tank to stabilize the water quantity and the water quality.
2) Enabling the effluent of the desulfurization wastewater collection tank to enter a microfiltration module through a lift pump, and removing suspended solids and impurities; and the tubular microfiltration is adopted to carry out cross flow filtration on the desulfurization wastewater at the outlet of the triple box of the power plant, the concentrated water and backwashing drainage are repeatedly circulated, and the concentrated sewage can directly enter a slurry pool of the desulfurization absorption tower. From the process flow, the tubular microfiltration device mainly replaces a sedimentation tank and a filter tank in the conventional coagulation clarification process, but has obvious advantages in the aspects of land occupation and effluent quality.
3) The tubular microfiltration product water enters a nanofiltration membrane, salt separation treatment is carried out on the selective permeability of soluble salt or solute by using the nanofiltration membrane, most of divalent ions are intercepted on one side of concentrated water by the nanofiltration membrane, the nanofiltration concentrated water returns to a desulfurization slurry pool, the removal rate of sulfate radicals and calcium and magnesium ions reaches more than 95%, and the recovery rate reaches more than 80%.
4) The nanofiltration produced water directly enters high molecular film evaporation equipment, fresh water is produced after evaporation and can be used as make-up water of a desulfurizing tower or a cooling tower, and concentrated water enters a subsequent zero-discharge system.
The nanofiltration effluent enters a film evaporation module, and the core of the film evaporation module is a film evaporator. And the desulfurization wastewater in the film evaporator is evaporated in a negative pressure environment after heat exchange to form steam, the steam is sucked by a booster fan and compressed to increase the latent heat of the steam, and the pressurized steam is injected into the inner side of the high polymer film and is continuously used for the evaporation of the desulfurization wastewater, so that a heat exchange cycle is established. The generated evaporator condensate water is taken out for recycling, so that the desulfurization wastewater entering the evaporator is continuously reduced and concentrated, and the concentrated wastewater finally generated after being concentrated to a certain degree enters a tail end bypass flue drying and curing system for curing.
Claims (4)
1. The utility model provides a concentrated decrement device of desulfurization waste water based on film evaporation technique which characterized in that: comprises a tubular microfiltration module, a nanofiltration module and a high molecular film evaporation module; the tubular microfiltration module comprises a microfiltration concentrated water tank (1), a microfiltration raw water tank (2), a microfiltration circulating pump (3), a microfiltration membrane group (4), a microfiltration product water tank (5) and a sludge discharge pump (6), desulfurization wastewater at the outlet of the triple box enters the microfiltration raw water tank (2), the outlet of the microfiltration raw water tank (2) is connected with the inlet of the microfiltration circulating pump (3), the outlet of the microfiltration circulating pump (3) is connected with the inlet of the microfiltration membrane group (4), the water production end of the microfiltration membrane group (4) is connected with the inlet of the microfiltration product water tank (5), microfiltration concentrated water is connected with the microfiltration concentrated water tank (1), and a drain pipe at the bottom of the microfiltration concentrated water tank (1) is connected with the sludge discharge pump (6); the nanofiltration water tank (5) is connected to the nanofiltration module, the nanofiltration module comprises a nanofiltration booster pump (7), a nanofiltration cartridge filter (8), a nanofiltration high-pressure pump (9), a nanofiltration membrane group (10), a nanofiltration concentrated water tank (11), a nanofiltration water tank (12) and a nanofiltration concentrated water discharge pump (13), the outlet of the microfiltration water tank (5) is connected with the inlet of the nanofiltration booster pump (7), the outlet of the nanofiltration booster pump (7) is connected with the inlet of the nanofiltration cartridge filter (8), the outlet of the nanofiltration cartridge filter (8) is connected with the inlet of the nanofiltration high-pressure pump (9), the outlet of the nanofiltration high-pressure pump (9) is connected with the inlet of the nanofiltration membrane group (10), the nanofiltration water enters the nanofiltration water tank (12), the nanofiltration concentrated water enters the nanofiltration water tank (11), and the bottom water discharge pipe of the nanofiltration concentrated water tank (11) is connected with the nanofiltration concentrated water discharge pump (; the outlet of the nanofiltration water production tank (12) is connected to the high molecular film evaporation module.
2. The desulfurization waste water concentration and reduction device based on the thin film evaporation technology as claimed in claim 1, wherein: the microfiltration concentrated water tank (1) is connected with the microfiltration original water tank (2) in the same wall, and a gap is reserved between the microfiltration concentrated water tank (1) and the microfiltration original water tank (2).
3. The desulfurization waste water concentration and reduction device based on the thin film evaporation technology as claimed in claim 1, wherein: and a nanofiltration concentrated water discharge pump (13) is connected to the desulfurization slurry pool.
4. The desulfurization waste water concentration and reduction device based on the thin film evaporation technology as claimed in claim 1, wherein: the high polymer film evaporation module comprises a lifting pump (14), a film evaporator (15), a booster fan (16), a condensate water tank (17), a condensate liquid discharge pump (18), a heat exchanger (19) and a circulating pump (20); an outlet of the nanofiltration water production tank (12) is connected with an inlet of a lifting pump (14), an outlet of the lifting pump (14) is connected with an inlet of a heat exchanger (19), an outlet of the heat exchanger (19) is connected with a spray tray on the upper part of the thin film evaporator (15), the middle part of the thin film evaporator (15) is connected with a booster fan (16), the booster fan (16) is connected with a steam pipeline main pipe on the upper part of the spray tray, a condensate water main pipe inside the thin film evaporator (15) is connected with a condensate water tank (17), the bottom of the thin film evaporator (15) is connected with an inlet of a circulating pump (20), and an outlet of the circulating pump (20).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439881A (en) * | 2020-04-09 | 2020-07-24 | 浙江浙能技术研究院有限公司 | Desulfurization wastewater concentration and reduction device and method based on thin film evaporation technology |
| CN115540575A (en) * | 2022-09-19 | 2022-12-30 | 安徽正刚新能源科技有限公司 | Salicylic acid flash drying system |
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2020
- 2020-04-09 CN CN202020505437.1U patent/CN212198888U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439881A (en) * | 2020-04-09 | 2020-07-24 | 浙江浙能技术研究院有限公司 | Desulfurization wastewater concentration and reduction device and method based on thin film evaporation technology |
| CN115540575A (en) * | 2022-09-19 | 2022-12-30 | 安徽正刚新能源科技有限公司 | Salicylic acid flash drying system |
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