CN205011545U - Desulfurization waste water resourceful treatment device - Google Patents

Abstract

The utility model is a resource treatment device for desulfurization wastewater, which is aimed at the characteristics of desulfurization wastewater, that is, high hydrochloric acid inorganic wastewater, and adopts membrane treatment and evaporation crystallization treatment technology for efficient combination design. The structure includes a pretreatment system, a membrane concentration treatment system, Evaporation and crystallization treatment system. That is, first use lime, soda ash, weak acid bed to soften, and cross-flow tubular microfiltration membrane filtration to remove calcium and magnesium ions and heavy metal pollutants; Finally, the concentrated solution of the membrane concentration treatment system is evaporated and crystallized to produce sodium sulfate and sodium chloride for recovery, and the condensed water is reused, so as to achieve the purpose of resourceful treatment of desulfurization wastewater. The specific advantages are: ①The lime, soda ash, and weak acid beds are thoroughly softened; ②Reverse osmosis and electrodialysis are concentrated and efficient, and the water produced by reverse osmosis is reused; ③Evaporation and crystallization recover sodium sulfate and sodium chloride respectively; ④Resource treatment of desulfurization wastewater .

Description

Desulfurization wastewater resource treatment device

technical field

The utility model relates to a desulfurization waste water resource treatment device, which belongs to the technical field of industrial waste water treatment.

Background technique

Power plant flue gas is desulfurized by limestone-gypsum wet method. During the desulfurization process, high-concentration desulfurization wastewater is produced through circulation and concentration. The desulfurization wastewater has high concentration of suspended solids, Ca ²⁺ , Mg ²⁺ , Cl ^- , SO ₄ ^2- It has high ion concentration and contains some heavy metals, fluoride, _SiO2 , etc. It is one of the most difficult wastewater to treat at present.

The traditional desulfurization wastewater treatment adopts the "three-box (neutralization, sedimentation, flocculation) - clarification tank" process, by adding lime, organic sulfur, flocculants and coagulants to remove heavy metals and fluorides, making heavy metal pollutants Discharge up to the standard, the disadvantage is that the salt content in the water seriously exceeds the standard, which will affect the surrounding water body. Few desulfurization wastewater treatment resources or zero discharge, at present, Guangdong Heyuan Power Plant has adopted the "lime plus soda ash two-stage softening and removal of heavy metals - direct multi-effect evaporation" process, to achieve zero discharge, but the softening effect is not good , the energy consumption of direct evaporation is too high, and it is unaffordable for users economically; another Zhejiang Changxing Power Plant adopts the process of "softening and removing heavy metals-reverse osmosis concentration-forward osmosis re-concentration-evaporation crystallization" to achieve the effect of resource treatment, but it is not Penetration investment is high, and system technology is difficult to promote. With the improvement of environmental protection regulations, the requirements for total salt in wastewater discharge are gradually increasing, and new technology and equipment are needed to recycle desulfurization wastewater to achieve the goal of zero discharge.

Contents of the invention

The utility model proposes a resource treatment device for desulfurization wastewater, and its purpose is to solve the problems existing in the treatment of desulfurization iron wastewater at present. . pH of desulfurization wastewater before treatment: 4~6, SS (suspended solid): 5000~12000mg/L, Ca ²⁺ (calcium ion): 1000~2000mg/L, Mg ²⁺ (magnesium ion): 3000~7000mg/L , Cl ^- (chloride ion): 7000～17000mg/L, SO ₄ ^2- (sulfate ion): 4000～8000mg/L, SiO ₂ (silicon dioxide): 5～50mg/L, TDS (total dissolved solids) : 16000～36000mg/L, the treated effluent meets the water quality standard of circulating water, and is reused in the circulating water system, and the evaporated and crystallized Na ₂ SO ₄ (sodium sulfate) and NaCl (sodium chloride) are recovered to reach the desulfurization wastewater resource purpose of processing.

The technical solution of the utility model: desulfurization wastewater resource treatment device, which is characterized in that it includes a pretreatment system (1), a membrane concentration treatment system (2), and an evaporation crystallization system (3); wherein the pretreatment system (1) is The water outlet is connected to the desulfurization wastewater pipe, the return water inlet of the pretreatment system (1) is connected to the electrodialysis water production pipe of the membrane concentration treatment system (2), and the outlet pipe of the pretreatment system (1) is connected to the water inlet of the membrane concentration treatment system (2) , the pretreatment system (1) has an outlet for the mud cake produced by the pretreatment system, the concentrated water pipe of the membrane concentration treatment system (2) is connected to the liquid inlet of the evaporation crystallization system (3), and the membrane concentration treatment system ( 2) The reverse osmosis water production pipe connected to the membrane concentration treatment system (2), the evaporative crystallization system (3) connected to the condensed water pipe of the evaporative crystallization system (3), and the evaporative crystallization system (3) has one to send out the condensed water produced by the evaporative crystallization system (3) Recover the salt outlet of salt.

Advantages of this utility model: This device is aimed at the characteristics of desulfurization wastewater, that is, high hydrochloric acid inorganic wastewater, and adopts advanced membrane treatment and evaporation crystallization treatment technology for efficient combination design, including pretreatment system, membrane concentration treatment system, evaporation crystallization processing system. That is, first use lime, soda ash, weak acid bed (WAC) to soften, cross-flow tubular microfiltration membrane (DF) to filter, remove calcium and magnesium ions and heavy metal pollutants; then use reverse osmosis (RO) and electrodialysis ( EDR) for concentration reduction, reverse osmosis product water reuse; finally, the concentrated solution of the membrane concentration treatment system is evaporated and crystallized, and sodium sulfate (Na2SO4) and sodium chloride (NaCl) are produced respectively for recovery, and the condensed water is reused, thereby To achieve the purpose of resource treatment of desulfurization wastewater. The specific advantages are: ①The lime, soda ash, and weak acid beds are thoroughly softened; ②Reverse osmosis and electrodialysis are concentrated and efficient, and the water produced by reverse osmosis is reused; ③Evaporation and crystallization recover sodium sulfate and sodium chloride respectively; ④Resource treatment of desulfurization wastewater .

Description of drawings

Accompanying drawing 1 is the overall structure schematic diagram of desulfurization wastewater resource treatment device.

Accompanying drawing 2 is the schematic structural diagram of the pretreatment system of the desulfurization wastewater resource treatment device.

Accompanying drawing 3 is the schematic diagram of the structure of the concentration and evaporation crystallization system of the desulfurization wastewater resource treatment device.

Accompanying drawing 4 is the water volume balance diagram of the embodiment of the desulfurization wastewater recycling treatment device.

In the drawings, 1 represents the pretreatment system (PT), 2 represents the membrane concentration treatment system (CT), 3 represents the evaporation crystallization system (VT); 1-1 represents the desulfurization wastewater regulating pool (BF), and 1-2 represents 1# Reaction pool (R1), 1-3 means clarification pool (S1), 1-4 means intermediate pool (T1), 1-5 means 2# reaction pool (R2), 1-6 means concentration pool (S2), 1- 7 means tubular filter device (DF), 1-8 means weak acid bed (WAC), 1-9 means clear water tank (T2), 1-10 means aeration and stirring fan (B1), 1-11 means lime/organic Sulfur/flocculant/coagulant dosing device (D1), 1-12 means stirring fan (B2), 1-13 means soda ash/organic sulfur/flocculant dosing device (D2), 1-14 means hydrochloric acid dosing Device (D3), 1-15 means sludge dewatering device (SP), 1-16 means pickling dosing device (D ₄ ), 1-17 means hydrochloric acid/caustic soda dosing device for resin regeneration (D ₅ ); 2 -1 means reverse osmosis device (RO), 2-2 means reverse osmosis concentrated water tank (T ₃ ), 2-3 means electrodialysis device (EDR), 2-4 means electrodialysis concentrated water tank (T ₄ ), 2-5 Indicates the reverse osmosis cleaning device (D ₆ ), 2-6 represents the reverse osmosis product water tank (T ₅ ), 2-7 represents the electrodialysis cleaning device (D ₇ ), 3-1 represents the evaporation crystallization device (MVR), 3-2 Indicates the steam decompression device (SM), 3-3 indicates the evaporation and crystallization condensate water tank (T ₅ ); DSWW indicates the desulfurization waste water pipe, PW indicates the reverse osmosis production water pipe of the membrane concentration treatment system, CW indicates the condensate water pipe of the evaporation and crystallization system, SC Indicates the outgoing mud cake produced by the pretreatment system, SA indicates the salt produced by the evaporation crystallization system, PTW indicates the outlet pipe of the pretreatment system, CTW indicates the concentrated water pipe of the membrane concentration treatment system, and EDPW indicates the electrodialysis water production pipe of the membrane concentration treatment system.

detailed description

Referring to accompanying drawing 1, the desulfurization wastewater resource treatment device has a structure including a pretreatment system 1, a membrane concentration treatment system 2, and an evaporation crystallization system 3;

The water inlet of the pretreatment system 1 is connected to the desulfurization wastewater pipe DSWW, the return water inlet of the pretreatment system 1 is connected to the electrodialysis water production pipe EDPW of the membrane concentration treatment system 2, and the outlet pipe PTW of the pretreatment system 1 is connected to the membrane concentration treatment system 2. Water inlet, pretreatment system 1 has a mud port for exporting mud cake SC generated by the pretreatment system, concentrated water pipe CTW of membrane concentration treatment system 2 is connected to the liquid inlet of evaporation crystallization system 3, and membrane concentration treatment system 2 is connected to the membrane The reverse osmosis water production pipe PW of the concentration treatment system 2, the evaporative crystallization system 3 is connected to the condensed water pipe CW of the evaporative crystallization system 3, and the evaporative crystallization system 3 has a salt outlet for sending the recovered salt SA generated by the evaporative crystallization system 3.

Contrasting accompanying drawing 2, pretreatment system 1, its structure comprises desulfurization waste water regulating pond 1-1, 1# reaction pond 1-2, clarification pond 1-3, middle pool 1-4, 2# reaction pond 1-5, concentrated Pool 1-6, tubular membrane filter device 1-7, weak acid bed 1-8, clear water tank 1-9, aeration and stirring fan 1-10, lime/organic sulfur/flocculant/coagulation aid dosing device 1- 11. Stirring fan 1-12, soda ash/organic sulfur/flocculant dosing device 1-13, hydrochloric acid dosing device 1-14, sludge dehydration device 1-15, pickling dosing device 1-16, resin regeneration Hydrochloric acid/caustic soda dosing device 1-17; wherein the desulfurization wastewater pipe DSWW is connected to the water inlet of the desulfurization wastewater regulating tank 1-1, and the air outlet of the aeration stirring fan 1-10 is connected to the air inlet of the desulfurization wastewater regulating tank 1-1, and the desulfurization wastewater The water outlet of wastewater regulating tank 1-1 is connected to the water inlet of 1# reaction tank 1-2, and the drug outlet of lime/organic sulfur/flocculant/coagulant aid dosing device 1-11 is connected to 1# reaction tank 1-2 The drug inlet of the 1# reaction tank 1-2 is connected to the water inlet of the clarifier 1-3, and the sludge discharge port of the clarifier 1-3 is connected to the sludge inlet of the sludge dehydration device 1-15, and the clarifier 1 The water outlet of -3 is connected to the water inlet of the middle pool 1-4, the air outlet of the stirring fan 1-12 is connected to the air inlet of the middle pool 1-4, and the water outlet of the middle pool 1-4 is connected to the 2# reaction pool 1-5 The water inlet, the drug outlet of soda ash/organic sulfur/flocculant dosing device 1-13 are connected to the drug inlet of 2# reaction pool 1-5, the water outlet of 2# reaction pool 1-5 is connected to the concentration pool 1-6 The water inlet, the sludge outlet of the thickening tank 1-6 is also connected to the mud inlet of the sludge dewatering device 1-15, and the water outlet of the thickening tank 1-6 is connected to the water inlet of the tubular membrane filter device 1-7, and the tubular filter The backwater port of the membrane device 1-7 is connected to the return water inlet of the concentration pool 1-6, the drug outlet of the pickling dosing device 1-16 is connected to the drug inlet of the tubular membrane device 1-7, and the tubular filter device The water outlet of 1-7 is connected to the water inlet of weak acid bed 1-8, the drug outlet of hydrochloric acid dosing device 1-14 is also connected to the water inlet of weak acid bed 1-8, and the hydrochloric acid/caustic soda dosing device for resin regeneration 1-17 The drug outlet of the weak acid bed is connected to the drug inlet of the weak acid bed 1-8, the outlet of the weak acid bed 1-8 is connected to the 1# return water inlet of the desulfurization wastewater regulating tank 1-1, and the water outlet of the weak acid bed 1-8 is connected to the clear water tank 1 The water inlet of -9, the electrodialysis water production pipe EDPW of the membrane concentration treatment system is connected to the return water inlet of the clean water tank 1-9, the water outlet of the clean water tank 1-9 is connected to the outlet pipe PTW of the pretreatment system, and the sludge dewatering device 1-15 The outlet of the filtrate is connected to the 2# return water inlet of the desulfurization wastewater regulating tank 1-1, and the sludge outlet of the sludge dewatering device 1-15 is connected to the outlet of the mud cake SC generated by the pretreatment system.

With reference to accompanying drawing 3, membrane concentration treatment system 2, its structure comprises reverse osmosis device 2-1, reverse osmosis concentrated water tank 2-2, electrodialysis device 2-3, electrodialysis concentrated water tank 2-4, reverse osmosis cleaning device 2- 5. Reverse osmosis water production tank 2-6, electrodialysis cleaning device 2-7; wherein the outlet pipe PTW of the pretreatment system is connected to the water inlet of the reverse osmosis device 2-1, and the liquid outlet of the reverse osmosis cleaning device 2-5 is connected to the reverse osmosis The liquid inlet of the device 2-1, the water production port of the reverse osmosis device 2-1 are connected to the water inlet of the reverse osmosis water production tank 2-6, and the water outlet of the reverse osmosis production water tank 2-6 is connected to the reverse osmosis production water pipe of the membrane concentration treatment system PW, the concentrated water port of the reverse osmosis device 2-1 is connected to the water inlet of the reverse osmosis concentrated water tank 2-2, the water outlet of the reverse osmosis concentrated water tank 2-2 is connected to the water inlet of the electrodialysis device 2-3, and the electrodialysis cleaning device 2- The liquid outlet of 7 is connected to the liquid inlet of electrodialysis device 2-3, the water production port of electrodialysis device 2-3 is connected to the electrodialysis water production pipe EDPW of the membrane concentration treatment system, and the concentrated water port of electrodialysis device 2-3 is connected to electrodialysis The water inlet of the concentrated water tank 2-4 and the water outlet of the electrodialysis concentrated water tank 2-4 are connected to the concentrated water pipe CTW of the membrane concentration treatment system.

Evaporation and crystallization system 3, its structure includes evaporation and crystallization device 3-1, steam decompression device 3-2, evaporation and crystallization condensate water tank 3-3; wherein the liquid inlet of evaporation and crystallization device 3-1 is connected to the concentrated water pipe CWT of the membrane concentration treatment system , the steam outlet of the steam decompression device 3-2 is connected to the steam inlet of the evaporative crystallization device 3-1, the salt outlet of the evaporative crystallization device 3-1 is connected to the salt SA produced by the evaporative crystallization system, and the condensate of the evaporative crystallization device 3-1 The outlet is connected to the water inlet of the evaporation and crystallization condensation water tank 3-3, and the water outlet of the condensation water tank 3-3 is connected to the condensation water pipe CW of the evaporation crystallization system.

A method for resourceful treatment of desulfurization wastewater, comprising the following steps:

1) In the pretreatment system of desulfurization wastewater, lime, soda ash, organic sulfur, flocculant, and coagulant are added to remove hardness and heavy metal pollutants, and to separate out the mud cake;

2) Through the membrane concentration treatment system, reverse osmosis and electrodialysis are used for concentration reduction, and reverse osmosis water is reused;

3) Evaporation and crystallization system, respectively evaporating and crystallizing sodium sulfate and sodium chloride for recycling, and reusing the condensate from evaporation and crystallization to achieve the purpose of resourceful treatment of desulfurization wastewater.

Step 1) The desulfurization wastewater is in the pretreatment system, specifically, the desulfurization wastewater enters the intermediate pool through the desulfurization wastewater adjustment tank, 1# reaction tank, and clarification tank in sequence, and in the desulfurization wastewater adjustment tank, the aeration by the aeration stirring fan Gas stirring to adjust the water quality and quantity, add lime, organic sulfur, flocculant, and coagulant to the 1# reaction tank, remove hardness and heavy metal pollutants through sedimentation in the clarification tank, and discharge the sludge to the sludge dehydration device, the middle tank It is also connected with a stirring fan to prevent precipitation; the effluent from the middle pool enters the clear water pool through the 2# reaction pool, the concentration pool, the tubular membrane device, and the weak acid bed in sequence, and soda ash, organic sulfur, and flocculant are added to the 2# reaction pool. Separation and concentration are carried out in the concentration tank through a tubular membrane filter device to further remove hardness and heavy metal pollutants. The sedimented sludge in the concentration tank is also discharged to the sludge dewatering device. Clean and initially soften the effluent to adjust the pH to 7-8.5 through the hydrochloric acid dosing device. The weak acid bed removes residual hardness. The weak acid bed is connected with a hydrochloric acid/caustic soda dosing device for resin regeneration to regenerate the weak acid bed, and the regenerated water returns to the desulfurization wastewater adjustment tank. Retreatment; the desiccated cake filtered out of the sludge dewatering device is transported outside, and the filtrate filtered out of the sludge dewatering device is returned to the desulfurization wastewater adjustment tank for retreatment; the effluent from the clear water tank is sent to the membrane concentration treatment system, and the membrane concentration treatment system The electrodialysis water is returned to the clean water tank for retreatment. pH of desulfurization wastewater: 4~6, SS (suspended solids): 5000~12000mg/L, Ca2+ (calcium ion): 1000~2000mg/L, Mg2+ (magnesium ion): 3000~7000mg/L, Cl-(chloride ion ): 7000～17000mg/L, SO42- (sulfate ion): 4000～8000mg/L, SiO2 (silicon dioxide): 5～50mg/L, TDS (total dissolved solids): 16000～36000mg/L.

Step 2) through the membrane concentration treatment system, specifically, the effluent of the pretreatment system enters the reverse osmosis device for desalination treatment, and the water produced by the reverse osmosis device reaches the water standard of circulating water (TDS≤1000mg/L), and after reverse osmosis The produced water tank is reused, and the reverse osmosis device is connected to a reverse osmosis cleaning device for regular chemical cleaning; the concentrated water of the reverse osmosis device passes through the reverse osmosis concentrated water tank and enters the electrodialysis device for further concentration and reduction (TDS concentration to 12-18%). The electrodialysis unit is connected with an electrodialysis cleaning unit for regular cleaning of the electrodialysis unit. The produced water from the electrodialysis unit is returned to the pretreatment system, and the concentrated water from the electrodialysis unit is sent to the evaporation crystallization system through the electrodialysis unit’s concentrated water tank.

The step 3) evaporation and crystallization system, specifically, the concentrated water through the membrane concentration treatment system enters the evaporation crystallization device, and the evaporation crystallization device adopts mechanical vapor recompression technology to produce industrial quality (purity ≥ 98%) sodium sulfate and Sodium chloride, the evaporative crystallization device is connected with a steam decompression device to start the evaporative crystallization system with external steam and supplement a small amount of steam. The condensate produced by the evaporative crystallization device is reused through the evaporative crystallization condensate tank.

Example:

A 35m ³ /h desulfurization wastewater resource treatment project for a power plant flue gas limestone-gypsum wet desulfurization.

1. Design water quality and quantity

(1) Design the water quality and quantity of desulfurization wastewater: project pH SS(mg/L) Ca ²⁺ (mg/L) Mg ²⁺ (mg/L) Na ⁺ (mg/L) Desulfurization wastewater 4～6 9340 1320 4560 170 project Cl ^- (mg/L) SO ₄ ^2- (mg/L) F (mg/L) SiO ₂ (mg/L) TDS(mg/L) Desulfurization wastewater 11640 5750 3 45 23800

The volume of desulfurization wastewater is 35m ³ /h;

(2) Water quality and quantity of reverse osmosis product:

The water quality of reverse osmosis is better than that of circulating water replenishment, TDS≤500mg/L, and the volume of reverse osmosis water is 28.5m ³ /h;

(3) Water quality and quantity of evaporation and crystallization condensate:

The water quality of evaporative crystallization condensate meets the requirements of reuse water, TDS≤100mg/L, and the water volume of evaporative crystallization condensate is 5.5m ³ /h;

(4) Quality and quantity of recovered industrial salt:

The purity of recovered industrial salt reaches 98%, including 0.3T/h sodium sulfate and 0.65T/h sodium chloride.

2. water balance

For the water volume balance and water quality (TDS) of each part of the desulfurization wastewater recycling treatment project, refer to the water balance figure 4 of the embodiment of the desulfurization wastewater recycling treatment device.

3. The main parameters of each system

(1) Pretreatment system:

(1.1) Desulfurization wastewater regulating pool: 20mX7.5mX6m (effective volume 840m ³ ), steel-concrete FRP anti-corrosion, 1 seat. Supporting desulfurization wastewater lift pump: Q=40m ³ /h, H=15m, N=5.5kW, material: fluoroplastic, 2 sets (1 for use and 1 for standby);

(1.2) 1# reaction tank: 9mX3mX3.4m (divided into 3 compartments), material: carbon steel FRP anti-corrosion, 1 set. Supporting mixer: N=7.5kW, 3 sets;

(1.3) Clarification tank: Φ8000X7000mm, material: carbon steel FRP anti-corrosion, 1 set. Supporting mud scraper: N=1.5kW, 1 set; mud pump: Q=15m ³ /h, H=20, N=4kW, 2 sets (1 for use and 1 for standby);

(1.4) Intermediate pool: V=40m ³ , material: carbon steel FRP anti-corrosion, 1 set. Supporting intermediate water pump: Q=40m ³ /h, H=15m, N=5.5kW, material: fluorine plastic, 2 sets (1 for use and 1 for standby);

(1.5) 2# reaction tank: 6mX3mX3.4m (divided into 2 compartments), material: carbon steel FRP anti-corrosion, 1 set. Matching mixer: N=7.5kW, 2 sets;

(1.6) Concentration tank: 3mX3mX3.4m, material: carbon steel FRP anti-corrosion, 1 set. Supporting agitator: N=7.5kW, 1 set; circulation pump: Q=110m ³ /h, H=45m, N=30kW, material: fluorine plastic, 4 sets; mud pump: Q=15m ³ /h, H =20, N=4kW, 2 sets (1 for use and 1 for backup);

(1.7) Tubular membrane filtration device: Q=40m ³ , 1 set, 4 columns/set, including 36 tubular membranes (9 pieces/column, membrane area: 4.25m ² /piece);

(1.8) Weak acid bed: Φ3000mmX5000mm, material: carbon steel rubber lining, 2 sets, built with special salt-resistant Ao composite resin H=1.25m (LewatitMDSTP260), running in series, the weak acid bed at the front desk is saturated and regenerated and placed in the rear;

(1.9) Clear water pool: V=40m ³ , material: carbon steel FRP anticorrosion, 1 set. Supporting reverse osmosis booster pump: Q=44m ³ /h, H=30m, N=7.5kW, material: fluoroplastic, 2 sets (1 for use and 1 for backup);

(1.10) Aeration and stirring fan: Q=35m ³ /min, ΔP=63.7kPa, N=55kW, 3 sets (2 for use and 1 for standby);

(1.11) Lime/organic sulfur/flocculant/coagulant aid dosing device: lime milk preparation box (with stirring): Φ2700X3000mm, material: carbon steel FRP anticorrosion, 1 piece, with circulation pump: Q=10m ³ /h, H=20m, N=2.2kW, material: fluorine plastic, 2 sets (1 for use and 1 for backup). Lime milk metering box (with stirring): Φ2700X3000mm, material: carbon steel FRP anti-corrosion, 1, with lime milk metering pump: Q=1800L/h, H=30m, N=0.75kW, material: pump head PVC, 2 sets (1 for use and 1 for backup). Organic sulfur metering box (with stirring): Φ2000X3000mm, material: carbon steel FRP anti-corrosion, 1, equipped with organic sulfur metering pump (with frequency conversion): Q=0～25L/h, H=30m, N=0.55kW, material: PVC pump head, 2 sets (1 for use and 1 for standby). Coagulant metering box (with stirring): Φ2000X3000mm, material: carbon steel FRP anti-corrosion, 1 piece, equipped with coagulant metering pump (with frequency conversion): Q=0～130L/h, H=30m, N=0.55kW, Material: PVC pump head, 2 sets (1 for use and 1 for standby). Coagulant aid metering box (with stirring): Φ2000X3000mm, material: carbon steel FRP anti-corrosion, 2 pieces, equipped with coagulant aid metering pump (with frequency conversion): Q=0～415L/h, H=30m, N=0.55kW, Material: PVC pump head, 2 sets (1 for use and 1 for standby);

(1.12) Stirring fan: Q=3m ³ /min, ΔP=49kPa, N=4kW, 2 sets (1 for use and 1 for standby);

(1.13) Soda ash/organic sulfur/flocculant dosing device: soda ash automatic dosing system: three-tank type, preparation capacity 200L/h, preparation concentration 5%, 1 set, equipped with soda ash metering pump (with frequency conversion): Q=85L /h, H=70m, N=0.37kW, material: PVC pump head, 2 sets (1 for use and 1 for standby). Organic sulfur metering box (with stirring): V=1m ³ , material: PE, 1 piece, equipped with organic sulfur metering pump (with frequency conversion): Q=0～25L/h, H=30m, N=0.55kW, material : PVC pump head, 2 sets (1 for use and 1 for standby). Coagulant metering box (with stirring): V=1m ³ , material: PE, 1 piece, equipped with coagulant metering pump (with frequency conversion): Q=0～30L/h, H=30m, N=0.55kW, Material: PVC pump head, 2 sets (1 for use and 1 for standby);

(1.14) Hydrochloric acid dosing device: Hydrochloric acid storage tank: Φ2000X3000mm, material: carbon steel lined with rubber, 1 set, matching acid unloading pump: Q=10m ³ /h, H=5m, N=2.2kW, material: fluoroplastic, 1 set; hydrochloric acid metering pump: Q=0～4.3L/h, H=30m, N=0.55kW, material: pump head PVC, 2 sets (1 for use and 1 for standby); acid mist absorber: Φ500X1000mm, material: PVC , 1;

(1.15) Sludge dewatering device: plate and frame filter press: A=300m ² , 2 sets, supporting sludge storage tank (with stirring): V=100m ³ , material: carbon steel anti-corrosion, 1 piece, sludge pump: Q=30m3/h, H=80, N=15kW, 3 sets (2 for 1 standby); flushing pump: Q=8m3/h, H=500m, N=15kW, 1 set; and filtrate tank (with stirring) , filtrate return pump, etc.;

(1.16) Pickling and dosing device: hydrochloric acid metering box: V=0.5m ³ , material: carbon steel lined with rubber, 1 set, matching hydrochloric acid metering pump: Q=1.9L/h, H=172m, N=22W, material : PVC pump head, 2 sets (1 for use and 1 for standby);

(1.17) Hydrochloric acid/caustic soda dosing device for resin regeneration: acid metering box V=2m ³ , material: carbon steel rubber-lined, 1 set; alkali metering box V=4m ³ , material: carbon steel rubber-lined, 1 set; matching Acid and alkali injectors, material: FRP, 2 sets; acid-base regeneration pump: Q=10m ³ /h, H=20m, N=2.2kW, material: fluorine plastic, 2 sets; alkali storage tank: V=10m ³ , Material: carbon steel rubber lining, 1 set.

(2) Membrane concentration treatment system:

(2.1) Reverse osmosis device: Q=15m ³ /h, Re=70%, 2 sets, including 60 seawater membranes (30 pieces per set, single membrane area 34.4m ² ), 10 reverse osmosis membrane shells (each Set of 5 pieces, 8"X6 core, 1200psi). Supporting security filter: Q=22m ³ /h, filtration accuracy 5μm, 2 sets; reverse osmosis high pressure pump (with frequency conversion): Q=15.4m ³ /h, H= 520m, N=30kW, material: duplex steel 2205, 2 sets; reverse osmosis interstage booster pump: Q=13.2m ³ /h, H=250m, N=15kW, material: duplex steel 2205, 2 sets; Energy recovery device: PX-45PB, Q=8.4m ³ /h, 2 sets;

(2.2) Concentrated reverse osmosis water tank: V=20m ³ , made of PE, 1 set. Supporting electrodialysis inlet pump: Q=40m ³ /h, H=30m, N=5.5kW, material: fluoroplastic, 2 sets (1 for use and 1 for standby);

(2.3) Electrodialysis device: treatment influent Q=12m ³ /h, product water Q=5.5m ³ /h, 1 set, including electrodialysis main body: first stage and first stage 400X1600, 12 sets. Supporting 2*15A/250V rectifiers, 6 sets; electrodialysis feed water and concentrated water filter: Q=40m ³ /h, filtration accuracy 5μm, 2 sets; electrodialysis concentrated water circulation pump: Q=40m ³ /h, H= 30m, N=5.5kW, material: fluoroplastic, 2 sets (1 for use and 1 for standby); electrodialysis polar water circulation pump: Q=20m ³ /h, H=30m, N=4kW, material: fluoroplastic, 2 sets ( 1 for use and 1 for standby); electrodialysis produced water and concentrated water circulating water tank: V=20m ³ , material PE, 2 sets;

(2.4) Concentrated water tank for electrodialysis: V=20m ³ , material: PE, 1 set; matching evaporation and crystallization system inlet pump: Q=10m ³ /h, H=30m, N=2.2kW, material: fluoroplastic, 2 sets (1 for use and 1 for backup);

(2.5) Reverse osmosis cleaning device: cleaning tank V=2m ³ , material: PE, 1 set. Supporting electric heater: N=7.5kW, material: SS316L, 1 set; cleaning pump: Q=24m ³ /h, H=40m, N=5.5kW, material: fluoroplastic, 1 set; cleaning filter: Q= 24m ³ /h, filtration precision 5μm, material: PP, 1 set;

(2.6) Reverse osmosis product water tank: V=20m ³ , material: PE, 1 set; supporting reverse osmosis product water recycling pump: Q=30m ³ /h, H=50m, N=15kW, material: SS304, 2 sets (1 for use and 1 for standby); reverse osmosis flushing pump: Q=24m ³ /h, H=30m, N=4kW, material: SS304, 1 set;

(2.7) Electrodialysis cleaning device: cleaning box V=2m ³ , material: PE, 1 set. Supporting cleaning pump: Q=25m ³ /h, H=30m, N=4kW, material: fluoroplastic, 1 set; cleaning filter: Q=40m ³ /h, filtration accuracy 5μm, material: PP, 1 set.

(3) Evaporation crystallization system:

(3.1) Evaporation and crystallization device: falling film evaporator: A=140m ² , forced circulation evaporator: A=390m ² , material: TA1/TA2/SS304, 1 each. Compressor unit (with frequency conversion): Q=5860kg/h, N=160kW, 2 sets. Supporting distilled water preheater, non-condensable gas preheater, fresh steam preheater, mother liquor preheater, final effect condenser, falling film separator, crystallization separator, mother liquor tank, centrifuge, etc.;

(3.2) Steam pressure reducing device: pressure reducing valve and throttling device, including safety protection device, supporting system;

(3.3) Evaporation and crystallization condensate tank: V=10m ³ , material: SS304, 1 set; matching condensate return pump: Q=10m ³ /h, H=50m, N=5kW, material: SS304, 2 sets (1 Prepare with 1).

(4) Supporting system:

(4.1) Compressed air storage tank for process: V=2m ³ , working pressure 0.8MPa, material: Q235R, 1 set. Compressed air storage tank for instruments: V=1m ³ , working pressure 0.8MPa, material: Q235R, 1 set;

(4.2) Electric control and instrument system: instrument, electric, control, cable, bridge, etc., 1 set;

(4.3) System installation: pipes, valves, brackets, etc., 1 set.

Claims (4)

1. Desulfurization wastewater resource treatment device, which is characterized by including a pretreatment system (1), a membrane concentration treatment system (2), and an evaporation crystallization system (3); wherein the water inlet of the pretreatment system (1) is connected to the desulfurization wastewater pipe, The return water inlet of the pretreatment system (1) is connected to the electrodialysis water production pipe of the membrane concentration treatment system (2), the outlet pipe of the pretreatment system (1) is connected to the water inlet of the membrane concentration treatment system (2), and the pretreatment system (1 ) has an outlet for the mud cake exported from the pretreatment system, the concentrated water pipe of the membrane concentration treatment system (2) is connected to the liquid inlet of the evaporation crystallization system (3), and the membrane concentration treatment system (2) is connected to the membrane concentration treatment The reverse osmosis water production pipe of the system (2), the evaporative crystallization system (3) is connected to the condensed water pipe of the evaporative crystallization system (3), and the evaporative crystallization system (3) has a salt outlet that sends out the recovered salt produced by the evaporative crystallization system (3) . 2. The desulfurization wastewater resource treatment device according to claim 1, characterized in that the pretreatment system (1) is structured such that the desulfurization wastewater pipe is connected to the water inlet of the desulfurization wastewater regulating tank, and the outlet of the aeration stirring fan is The tuyere is connected to the air inlet of the desulfurization wastewater regulating tank, the outlet of the desulfurization wastewater regulating tank is connected to the water inlet of the 1# reaction tank, and the drug outlet of the lime/organic sulfur/flocculant/coagulant dosing device is connected to the 1# reaction tank The drug inlet, the water outlet of the 1# reaction tank is connected to the water inlet of the clarification tank, the sludge discharge port of the clarification tank is connected to the mud inlet of the sludge dewatering device, the water outlet of the clarification tank is connected to the water inlet of the intermediate pool, and the outlet of the stirring fan The tuyere is connected to the air inlet of the middle pool, the water outlet of the middle pool is connected to the water inlet of the 2# reaction pool, the drug outlet of the soda ash/organic sulfur/flocculant dosing device is connected to the drug inlet of the 2# reaction pool, and the 2# reaction pool The water outlet of the concentration tank is connected to the water inlet of the thickening tank, the sludge discharge port of the thickening tank is also connected to the mud inlet of the sludge dewatering device, the water outlet of the thickening tank is connected to the water inlet of the tubular membrane device, and the return port of the tubular membrane device Connect the return water inlet of the concentration tank, the drug outlet of the pickling dosing device is connected to the drug inlet of the tubular membrane device, the outlet of the tubular filter device is connected to the water inlet of the weak acid bed, and the drug outlet of the hydrochloric acid dosing device The port is also connected to the water inlet of the weak acid bed, the drug outlet of the hydrochloric acid/caustic soda dosing device for resin regeneration is connected to the drug inlet of the weak acid bed, the outlet of the weak acid bed is connected to the 1# return water inlet of the desulfurization wastewater regulating tank, and the outlet of the weak acid bed The water outlet is connected to the water inlet of the clean water tank, the electrodialysis water production pipe EDPW of the membrane concentration treatment system is connected to the return water inlet of the clean water tank, the water outlet of the clean water tank is connected to the outlet pipe of the pretreatment system, and the filtrate outlet of the sludge dewatering device is connected to the desulfurization wastewater adjustment The 2# return water inlet of the pool, and the mud outlet of the sludge dehydration device are connected to the outlet of the mud cake produced by the pretreatment system. 3. The desulfurization wastewater resource treatment device according to claim 1, characterized in that the membrane concentration treatment system (2) is structured such that the water inlet of the reverse osmosis device is connected to the outlet pipe of the pretreatment system, and the reverse osmosis cleaning device The liquid outlet of the reverse osmosis device is connected to the liquid inlet of the reverse osmosis device. The concentrated water port is connected to the water inlet of the reverse osmosis concentrated water tank, the water outlet of the reverse osmosis concentrated water tank is connected to the water inlet of the electrodialysis device, the liquid outlet of the electrodialysis cleaning device is connected to the liquid inlet of the electrodialysis device, and the water production port of the electrodialysis device is connected to The electrodialysis water production pipe of the membrane concentration treatment system, the concentrated water port of the electrodialysis device is connected to the water inlet of the electrodialysis concentrated water tank, and the water outlet of the electrodialysis concentrated water tank is connected to the concentrated water pipe of the membrane concentration treatment system. 4. The desulfurization wastewater resource treatment device according to claim 1, characterized in that the evaporation crystallization system (3) has a structure that the liquid inlet of the evaporation crystallization device is connected to the concentrated water pipe of the film concentration treatment system, and the evaporation crystallization device The steam inlet of the steam decompression device is connected to the steam outlet of the steam decompression device, the salt outlet of the evaporative crystallization device is connected to the salt produced by the evaporative crystallization system, the condensate outlet of the evaporative crystallization device is connected to the water inlet of the evaporative crystallization condensate tank, and the water outlet of the condensate tank is connected to the evaporation Condensate pipe for crystallization system.