CN214088122U - Zero discharge system of desulfurization waste water of steam power plant - Google Patents
Zero discharge system of desulfurization waste water of steam power plant Download PDFInfo
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- CN214088122U CN214088122U CN202023216519.3U CN202023216519U CN214088122U CN 214088122 U CN214088122 U CN 214088122U CN 202023216519 U CN202023216519 U CN 202023216519U CN 214088122 U CN214088122 U CN 214088122U
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Abstract
The utility model discloses a zero discharge system of desulfurization waste water of steam power plant. Comprises a pretreatment device, a softening device, an ozone oxidation tower, a filtering concentration device, a gaseous membrane deamination and denitrification device, an oxidation tank, an aeration tank and an active carbon filter which are sequentially communicated by pipelines; the chemical adding device comprises a slaked lime chemical adding device, a sodium hydroxide chemical adding device, a sulfuric acid chemical adding device, a flocculating agent chemical adding device, a coagulant aid chemical adding device, a sodium carbonate chemical adding device, a sodium hypochlorite chemical adding device and a sodium sulfite chemical adding device; the device also comprises a film transfer evaporation device, namely a rotary film evaporator, and the gaseous film denitrification device is provided with an ammonium sulfate outlet communicated with the film transfer evaporation device.
Description
Technical Field
The utility model belongs to the technical field of the waste water treatment of steam power plant, concretely relates to desulfurization waste water zero release system of steam power plant.
Background
The flue gas desulfurization of a thermal power plant is the only mature and large-scale commercialized desulfurization mode in the world at present, the byproduct of the flue gas desulfurization is gypsum, the gypsum is generally treated by a belt type vacuum suction filter and the like and then sold, and the gypsum is an important technical means for controlling sulfur dioxide pollution. When the power plant carries out flue gas desulfurization, still can carry out flue gas denitration, and during the denitration, often use ammonia as reductant, consequently, still can contain more dissolved ammonia in final desulfurization waste water.
The typical desulfurization wastewater of a coal-fired power plant generally contains a large amount of calcium magnesium ions, sulfate ions, chloride ions and fluorides, and also contains COD (chemical oxygen demand) and the like which are difficult to treat, the pH value is generally between 5 and 6, the water quality is weakly acidic, the wastewater has certain corrosivity on various metals, the calcium magnesium ions can cause scale and dirt blockage of treatment equipment, the high-content chloride ions can generate serious corrosion on the equipment and pipelines, the difficulty in treating the wastewater is high, and the cost is high.
At present, the common treatment method is to directly discharge the desulfurization wastewater along with the wet slag of the boiler to a fly ash storage yard for evaporation or to directly or indirectly evaporate by adopting a flue evaporation process, but the two processes have different limitations. Along with the environmental requirement, the existing thermal power plant is continuously upgraded and reformed, dry ash and dry slag are collected and comprehensively utilized, most of fly ash storage yards are closed, the flue evaporation process requires that heat in the flue is surplus, and in addition, the flue gas extraction not only influences the boiler efficiency, but also increases the unit coal consumption.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem provided in the background art, the utility model provides a zero discharge system of desulfurization waste water of steam power plant.
The utility model provides a zero discharge system of thermal power plant's desulfurization waste water, includes by pretreatment device, softening installation, ozone oxidation tower, filtration enrichment facility, gaseous state membrane deamination nitrogen device, oxidation groove, aeration tank, active carbon filter that the pipeline communicates in order.
Still include charge device, charge device passes through the pipeline and is connected with softening installation, and charge device includes slaked lime charge device, sodium hydroxide charge device, sulphuric acid charge device, flocculating agent charge device, coagulant aid charge device, sodium carbonate charge device, sodium hypochlorite charge device, sodium sulfite charge device.
The device also comprises a film transfer evaporation device, namely a rotary film evaporator, and the gaseous film denitrification device is provided with an ammonium sulfate outlet communicated with the film transfer evaporation device.
Furthermore, the pretreatment device comprises a pre-settling tank and an aeration regulating tank which are sequentially communicated through pipelines, the softening device comprises a primary clarifier, a secondary clarifier, a multi-media filter and a cation exchanger which are sequentially communicated, and the filtering and concentrating device comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially communicated.
Wherein, the first-stage clarifier is communicated with a slaked lime dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a sodium hypochlorite dosing device, and the second-stage clarifier is communicated with a sodium hydroxide dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a sodium carbonate dosing device.
Also comprises an aeration fan for blowing air into the preliminary sedimentation tank, the aeration adjusting tank and the aeration tank; the device also comprises a sludge filter-pressing device, and settling outlets leading to the sludge filter-pressing device are arranged at the bottoms of the primary clarifying tank and the secondary clarifying tank; the sludge filter pressing device is a membrane filter press.
Further, the membrane filter press is an ultrahigh pressure membrane filter press XAMYZGFS-800-2000 with three stages connected in series.
Furthermore, perforated aeration pipes are arranged at the bottoms of the pre-settling tank, the aeration regulating tank and the aeration tank and are communicated with an aeration fan for blowing air.
Further, the preliminary sedimentation tank is of a four-stage series structure, and two adjacent stages are communicated through overflow.
Furthermore, a sludge discharge pipe is arranged at the bottom of the pre-settling tank, and a sludge discharge pipe flushing pipe for flushing the sludge discharge pipe is also arranged, and the sludge discharge pipe is connected with the diaphragm pump.
Further, still be equipped with the sludge impoundment, the depositing outlet of clarification tank connects to the sludge impoundment earlier, from the export in sludge impoundment then even to mud filter pressing device.
The device is also provided with an intermediate water tank, the outlet of the ozone oxidation tower is connected to the intermediate water tank, and the outlet of the intermediate water tank is connected to the ultrafiltration device.
The device is also provided with an ultrafiltration water producing tank, wherein the outlet of the ultrafiltration device is connected to the ultrafiltration water producing tank firstly, and the ultrafiltration water producing tank is connected to the nanofiltration device.
And a nanofiltration water production tank is also arranged, an outlet of the nanofiltration device is connected to the nanofiltration water production tank firstly, and the nanofiltration water production tank is connected to the reverse osmosis device secondly.
The device is also provided with a concentrated brine tank, wherein an outlet of the reverse osmosis device, namely a concentrated brine outlet, is connected to the concentrated brine tank firstly, and the concentrated brine tank is connected to the gaseous membrane denitrification device; the reverse osmosis device is also provided with a reuse water tank, and the reverse osmosis device is also provided with a reuse water outlet which is connected to the reuse water tank.
And the outlet of the activated carbon filter is connected to the strong brine outlet tank.
Further, a first lifting pump is connected between the aeration regulating tank and the primary clarifier; a second lift pump is connected between the secondary clarifier and the multi-media filter; a third lift pump is connected between the middle water tank and the ultrafiltration device; a fourth lifting pump is arranged between the ultrafiltration water production tank and the nanofiltration device; a fifth lifting pump is arranged between the nanofiltration water production tank and the reverse osmosis device; a sixth lift pump is arranged between the concentrated brine tank and the gaseous membrane denitrification device; a seventh lifting pump is arranged between the reuse water tank and the rotary film evaporation device; an eighth lift pump is arranged between the aeration tank and the activated carbon filter.
Furthermore, the pre-settling tank and the aeration regulating tank, the primary clarifier and the secondary clarifier, the multi-medium filter and the cation exchanger, the cation exchanger and the ozone oxidation tower and the oxidation tank and the aeration tank are communicated in an overflow way.
Compared with the prior art, the utility model discloses following beneficial effect has: 1. the influence of the previous process on the subsequent process is fully considered, so that the removal process of various impurities is repeated for many times; 2. the method can perform targeted treatment on ammonia nitrogen, avoid impurity nitrogen elements in treated strong brine and recycled water, and prevent the phenomena of nitrogen pollution of water bodies and the like in equipment such as a storage tank, a water pool and the like; 3. design the second grade clarifier, add the two-stage clarifier with softening medicament respectively in, can judge the quantity of the medicament that needs to add comparatively accurately according to required pH, reduce the estimation degree of difficulty of reagent input volume to make the influence between the medicament reduce, can exert respective effect.
Drawings
FIG. 1: a partial schematic diagram of a desulfurization wastewater zero-discharge system of a thermal power plant.
FIG. 2: a partial schematic diagram of a desulfurization wastewater zero-discharge system of a thermal power plant.
FIG. 3: a partial schematic diagram of a desulfurization wastewater zero-discharge system of a thermal power plant.
FIG. 4: a schematic diagram of a chemical adding device of a thermal power plant desulfurization wastewater zero-discharge system.
Detailed Description
The invention will be further explained with reference to specific embodiments. The following embodiments are only explanations of the present invention, not limitations of the present invention, the technical solutions obtained by simple replacement and superposition performed on the basis of the present invention should fall into the protection scope of the present invention.
Example 1
As shown in fig. 1-4, a process schematic diagram of a zero discharge system for desulfurization wastewater of a thermal power plant is provided. The utility model provides a zero discharge system of thermal power plant's desulfurization waste water, includes by pretreatment device, softening installation, ozone oxidation tower, filtration enrichment facility, gaseous state membrane deamination nitrogen device, oxidation groove, aeration tank, active carbon filter that the pipeline communicates in order.
Still include charge device, charge device passes through the pipeline and is connected with softening installation, and charge device includes slaked lime charge device, sodium hydroxide charge device, sulphuric acid charge device, flocculating agent charge device, coagulant aid charge device, sodium carbonate charge device, sodium hypochlorite charge device, sodium sulfite charge device.
The device also comprises a film transfer evaporation device, namely a rotary film evaporator, and the gaseous film denitrification device is provided with an ammonium sulfate outlet communicated with the film transfer evaporation device.
Furthermore, the pretreatment device comprises a pre-settling tank and an aeration regulating tank which are sequentially communicated through pipelines, the softening device comprises a primary clarifier, a secondary clarifier, a multi-media filter and a cation exchanger which are sequentially communicated, and the filtering and concentrating device comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially communicated.
Wherein, the first-stage clarifier is communicated with a slaked lime dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a sodium hypochlorite dosing device, and the second-stage clarifier is communicated with a sodium hydroxide dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a sodium carbonate dosing device.
Also comprises an aeration fan for blowing air into the preliminary sedimentation tank, the aeration adjusting tank and the aeration tank; the device also comprises a sludge filter-pressing device, and settling outlets leading to the sludge filter-pressing device are arranged at the bottoms of the primary clarifying tank and the secondary clarifying tank; the sludge filter pressing device is a membrane filter press.
Further, the membrane filter press is an ultrahigh pressure membrane filter press XAMYZGFS-800-2000 with three stages connected in series.
Furthermore, perforated aeration pipes are arranged at the bottoms of the pre-settling tank, the aeration regulating tank and the aeration tank and are communicated with an aeration fan for blowing air.
Further, the preliminary sedimentation tank is of a four-stage series structure, and two adjacent stages are communicated through overflow.
Furthermore, a sludge discharge pipe is arranged at the bottom of the pre-settling tank, and a sludge discharge pipe flushing pipe for flushing the sludge discharge pipe is also arranged, and the sludge discharge pipe is connected with the diaphragm pump.
Further, still be equipped with the sludge impoundment, the depositing outlet of clarification tank connects to the sludge impoundment earlier, from the export in sludge impoundment then even to mud filter pressing device.
The device is also provided with an intermediate water tank, the outlet of the ozone oxidation tower is connected to the intermediate water tank, and the outlet of the intermediate water tank is connected to the ultrafiltration device.
The device is also provided with an ultrafiltration water producing tank, wherein the outlet of the ultrafiltration device is connected to the ultrafiltration water producing tank firstly, and the ultrafiltration water producing tank is connected to the nanofiltration device.
And a nanofiltration water production tank is also arranged, an outlet of the nanofiltration device is connected to the nanofiltration water production tank firstly, and the nanofiltration water production tank is connected to the reverse osmosis device secondly.
The device is also provided with a concentrated brine tank, wherein an outlet of the reverse osmosis device, namely a concentrated brine outlet, is connected to the concentrated brine tank firstly, and the concentrated brine tank is connected to the gaseous membrane denitrification device; the reverse osmosis device is also provided with a reuse water tank, and the reverse osmosis device is also provided with a reuse water outlet which is connected to the reuse water tank.
And the outlet of the activated carbon filter is connected to the strong brine outlet tank.
Further, a first lifting pump is connected between the aeration regulating tank and the primary clarifier; a second lift pump is connected between the secondary clarifier and the multi-media filter; a third lift pump is connected between the middle water tank and the ultrafiltration device; a fourth lifting pump is arranged between the ultrafiltration water production tank and the nanofiltration device; a fifth lifting pump is arranged between the nanofiltration water production tank and the reverse osmosis device; a sixth lift pump is arranged between the concentrated brine tank and the gaseous membrane denitrification device; a seventh lifting pump is arranged between the reuse water tank and the rotary film evaporation device; an eighth lift pump is arranged between the aeration tank and the activated carbon filter.
Furthermore, the pre-settling tank and the aeration regulating tank, the primary clarifier and the secondary clarifier, the multi-medium filter and the cation exchanger, the cation exchanger and the ozone oxidation tower and the oxidation tank and the aeration tank are communicated in an overflow way.
A thermal power plant desulfurization wastewater zero-discharge method comprises the following steps:
a. removing suspended particles in the desulfurization wastewater, and controlling the quality of the desulfurization wastewater: feeding the desulfurization wastewater into a pre-settling tank, settling suspended particles in the pre-settling tank, and then overflowing supernatant in the pre-settling tank to an aeration regulating tank; meanwhile, aeration is carried out in the pre-settling tank and the aeration adjusting tank at regular time, so that anaerobic reaction of sludge at the bottom of the tank is prevented, and the quality of the desulfurization wastewater is maintained.
b. Preliminarily softening the desulfurization wastewater, and simultaneously removing fluoride, partial sulfate ions, partial COD and partial ammonia nitrogen: the desulfurization wastewater in the aeration regulating reservoir is pumped into a primary clarifier, simultaneously flocculant, coagulant aid, sodium hypochlorite and excessive hydrated lime are added into the primary clarifier, wherein the flocculant can be Polymeric Ferric Sulfate (PFS), the coagulant aid can be Polyacrylamide (PAM), the precipitate of hydroxide of magnesium hydroxide, calcium fluoride, calcium sulfate and trace heavy metals is generated in the primary clarifier, the flocculant and the coagulant aid are added to facilitate the formation of alum blossom, meanwhile, the oxidability of the sodium hypochlorite is utilized to remove magnesium ions, fluoride, partial COD, partial ammonia nitrogen and partial sulfate ions in the desulfurization wastewater, then clear liquid in the primary clarifier overflows to a secondary clarifier, sodium hydroxide, the flocculant, the coagulant aid and sodium carbonate are added into the secondary clarifier to ensure that the pH value in the secondary clarifier is more than 11.76 to generate magnesium hydroxide and calcium carbonate precipitate, removing magnesium ions and saturated calcium ions in the desulfurization wastewater to primarily soften the desulfurization wastewater, and leading the bottoms of the primary clarifier and the secondary clarifier to a sludge filter-pressing device to filter-press sludge and then send the sludge out of the system.
c. And (3) secondary removal of suspended particles in the desulfurization wastewater: although the settled sediment is formed in the step b, a small part of the sediment is in a suspension state due to factors such as fluid disturbance and the like to become suspended particles, and the desulfurization wastewater in the secondary clarifier is pumped into a multi-medium filter to remove suspended matters in the wastewater. The multi-medium filter is a process of utilizing one or more filter media to remove suspended impurities and clarify water by passing water with high turbidity through a filter material with a certain thickness under a certain pressure, and the commonly used filter materials comprise quartz sand, anthracite, manganese sand and the like.
d. Secondary softening of the desulfurization wastewater: and overflowing clear liquid obtained by filtering through the multi-media filter to the cation exchanger, and replacing calcium and magnesium ions with sodium ions, thereby secondarily softening the desulfurization wastewater.
e. Removing COD in the desulfurization wastewater by oxidation: and the desulfurization wastewater secondarily softened by the cation exchanger overflows to an ozone oxidation tower, is subjected to ozone oxidation to remove COD, and enters an intermediate water tank.
f. Concentrating the desulfurization wastewater, and removing sulfate ions in the desulfurization wastewater: firstly, desulfurization waste water is pumped into an ultrafiltration device from a middle water tank, the ultrafiltration device intercepts fine particles and macromolecular substances in the desulfurization waste water, the filtered liquid enters an ultrafiltration water production tank, and then is pumped into a nanofiltration device to remove sulfate ions, the nanofiltration device is mainly used for separating salt, divalent ions such as sulfate radicals are intercepted, monovalent ions such as sodium ions and chloride ions pass through, the intercepted liquid containing the sulfate ions is sent back to an aeration regulating tank to be treated again, the filtrate enters a nanofiltration water production tank, and then is pumped into a reverse osmosis device to separate fresh water and enter a reuse water tank as reuse water, and the filtered concentrated strong brine enters a strong brine tank.
g. Ammonia nitrogen removal: the strong brine is pumped into a gaseous membrane denitrification device, sulfuric acid is used as absorption liquid, ammonia nitrogen in the strong brine is taken away, an ammonium sulfate solution is generated, and the ammonium sulfate is sent to a membrane transferring evaporation device for evaporation and crystallization.
h. Removing ammonia nitrogen, COD and free chlorine: the strong brine coming out of the gaseous film denitrification device enters an oxidation tank, sodium hypochlorite is added into the oxidation tank, the ammonia nitrogen in the water is ensured to be less than or equal to 1mg/L, the ammonia nitrogen, chloride ions and COD are further removed, but nitrogen trichloride and free chlorine (chlorine dissolved in the water) are probably generated, generally speaking, after the treatment of the gaseous film denitrification device, the ammonia nitrogen content is very low, the required amount of the sodium hypochlorite is very small, if the ammonia nitrogen is less than or equal to 1mg/L, the sodium hypochlorite is not needed to be added, then the strong brine is pumped into an aeration tank, sodium sulfite is added into the aeration tank to remove the hypochlorous acid and the free chlorine, thereby the oxidation-reduction potential value of the strong brine is adjusted, in addition, the aeration fan is used for ventilating the bottom of the aeration tank, the nitrogen trichloride which is a possible byproduct is further removed, the strong brine in the aeration tank is pumped into an activated carbon filter through a lifting pump, and removing residual COD and free chlorine in the strong brine as a final link, and flowing into a strong brine outlet tank to obtain pure strong brine which can be sent to a chlor-alkali plant as a production raw material.
Claims (9)
1. The utility model provides a zero discharge system of steam power plant desulfurization waste water which characterized in that: comprises a pretreatment device, a softening device, an ozone oxidation tower, a filtering concentration device, a gaseous membrane deamination and denitrification device, an oxidation tank, an aeration tank and an active carbon filter which are sequentially communicated by pipelines;
the chemical adding device comprises a slaked lime chemical adding device, a sodium hydroxide chemical adding device, a sulfuric acid chemical adding device, a flocculating agent chemical adding device, a coagulant aid chemical adding device, a sodium carbonate chemical adding device, a sodium hypochlorite chemical adding device and a sodium sulfite chemical adding device;
the device also comprises a film transfer evaporation device, namely a rotary film evaporator, and the gaseous film denitrification device is provided with an ammonium sulfate outlet communicated with the film transfer evaporation device.
2. The zero discharge system of desulfurization waste water of thermal power plant of claim 1, characterized in that: the pretreatment device comprises a pre-settling tank and an aeration regulating tank which are sequentially communicated through pipelines, the softening device comprises a primary clarifier, a secondary clarifier, a multi-medium filter and a cation exchanger which are sequentially communicated, and the filtering and concentrating device comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially communicated;
wherein, the first clarifier is communicated with a slaked lime dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a sodium hypochlorite dosing device, and the second clarifier is communicated with a sodium hydroxide dosing device, a flocculating agent dosing device, a coagulant aid dosing device and a sodium carbonate dosing device;
also comprises an aeration fan for blowing air into the preliminary sedimentation tank, the aeration adjusting tank and the aeration tank; the device also comprises a sludge filter-pressing device, and settling outlets leading to the sludge filter-pressing device are arranged at the bottoms of the primary clarifying tank and the secondary clarifying tank; the sludge filter pressing device is a membrane filter press.
3. The zero discharge system of desulfurization waste water of thermal power plant of claim 2, characterized in that: the membrane filter press is an ultrahigh pressure membrane filter press XAMYZGFS-800-2000 in three-stage series connection.
4. The zero discharge system of desulfurization waste water of thermal power plant of claim 2, characterized in that: the bottom of the pre-settling tank, the aeration adjusting tank and the aeration tank is provided with a perforated aeration pipe which is communicated with an aeration fan used for air blowing.
5. The zero discharge system of desulfurization waste water of thermal power plant of claim 2, characterized in that: the pre-settling tank is of a four-stage series structure, and two adjacent stages are communicated through overflow.
6. The zero discharge system of desulfurization waste water of thermal power plant of claim 2, characterized in that: the pre-settling tank bottom is provided with a sludge discharge pipe and a sludge discharge pipe flushing pipe for flushing the sludge discharge pipe, and the sludge discharge pipe is connected with the diaphragm pump.
7. The zero discharge system of desulfurization waste water of thermal power plant of claim 2, characterized in that: the device is also provided with a sludge tank, a sedimentation outlet of the clarification tank is connected to the sludge tank firstly, and then is connected to the sludge filter-pressing device from an outlet of the sludge tank;
the outlet of the ozone oxidation tower is connected to the middle water tank, and the outlet of the middle water tank is connected to the ultrafiltration device;
the device is also provided with an ultrafiltration water-producing tank, the outlet of the ultrafiltration device is connected to the ultrafiltration water-producing tank firstly, and the ultrafiltration water-producing tank is connected to the nanofiltration device;
a nanofiltration water production tank is also arranged, the outlet of the nanofiltration device is connected to the nanofiltration water production tank firstly, and then the nanofiltration water production tank is connected to the reverse osmosis device;
the device is also provided with a concentrated brine tank, wherein an outlet of the reverse osmosis device, namely a concentrated brine outlet, is connected to the concentrated brine tank firstly, and the concentrated brine tank is connected to the gaseous membrane denitrification device; the reverse osmosis device is also provided with a reuse water tank, and the reuse water outlet is connected to the reuse water tank;
and the outlet of the activated carbon filter is connected to the strong brine outlet tank.
8. The zero discharge system of desulfurization waste water of thermal power plant of claim 7, characterized in that: a first lifting pump is connected between the aeration adjusting tank and the primary clarifier; a second lift pump is connected between the secondary clarifier and the multi-media filter; a third lift pump is connected between the middle water tank and the ultrafiltration device; a fourth lifting pump is arranged between the ultrafiltration water production tank and the nanofiltration device; a fifth lifting pump is arranged between the nanofiltration water production tank and the reverse osmosis device; a sixth lift pump is arranged between the concentrated brine tank and the gaseous membrane denitrification device; a seventh lifting pump is arranged between the reuse water tank and the rotary film evaporation device; an eighth lift pump is arranged between the aeration tank and the activated carbon filter.
9. The zero discharge system of desulfurization waste water of thermal power plant of claim 2, characterized in that: the pre-settling tank and the aeration adjusting tank, the primary clarifier and the secondary clarifier, the multi-medium filter and the cation exchanger, the cation exchanger and the ozone oxidation tower and the oxidation tank and the aeration tank are communicated in an overflow way.
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