CN207468391U - A kind of system for spent lye processing - Google Patents

A kind of system for spent lye processing Download PDF

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Publication number
CN207468391U
CN207468391U CN201721539979.5U CN201721539979U CN207468391U CN 207468391 U CN207468391 U CN 207468391U CN 201721539979 U CN201721539979 U CN 201721539979U CN 207468391 U CN207468391 U CN 207468391U
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unit
outlet
tube
input port
oxidation
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李国文
张悦
包长春
王天德
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CAMDEX (BEIJING) ENERGY ENVIRONMENT SCIENCE & TECHNOLOGY Co Ltd
Camdex Beijing Energy Environment Science & Tech Co Ltd
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CAMDEX (BEIJING) ENERGY ENVIRONMENT SCIENCE & TECHNOLOGY Co Ltd
Camdex Beijing Energy Environment Science & Tech Co Ltd
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Abstract

The utility model provides a kind of system for spent lye processing, including:Circulating cooling water unit and sequentially connected catalytic wet oxidation unit, neutralize pool unit, electrolytic oxidation unit, evaporative crystallization unit, low-temperature evaporation crystalline element, the circulating cooling water unit is respectively with the catalytic wet oxidation unit, and electrolytic oxidation unit, evaporative crystallization unit is connected with low-temperature evaporation crystalline element.This system is apparent to the removal effect of COD, and the COD that evaporative crystallization can be intake is controlled in the range less than 100mg/L, ensure that normal, the continuous operation of evaporative crystallization unit, while ensure that the purity of sodium sulfate salt.Waste water is almost completely converted into high quality reuse water and high-quality sodium sulfate salt by system, has certain economic benefit.System fully recycles the waste heat that oxidation reaction and neutralization reaction generate, as the supplemental heat of evaporative crystallization unit and low-temperature evaporation crystalline element, it can be achieved that heat self-balancing in whole system, greatly reduces operation consumption.

Description

A kind of system for spent lye processing
Technical field
The utility model is related to technical field of waste water processing, more particularly to a kind of system for spent lye processing.
Background technology
In petrochemical production process, hydrogen sulfide, alkali cleaning oil product and cracking gas, production are absorbed frequently with sodium hydroxide solution The raw spent lye containing a large amount of pollutants.The characteristics of waste water is that COD is up to tens thousand of to hundreds thousand of milligrams per liter, simultaneously containing height The poisonous and harmful substances such as sulfide, phenols, the petroleum-type of concentration, basicity is strong, and pH is more than 12.
The processing method of spent lye mainly has neutralisation, wet air oxidation, burning method etc..Neutralisation is using inorganic Acid neutralizes salkali waste, and the sour gas (CO2, H2S etc.) of generation is sent into torch burning, the spent lye fed downstream sewage after neutralization Treatment plant.The SO2 of method torch burning generation is directly discharged into air, can cause serious atmosphere pollution, and after neutralisation treatment Spent lye is discharged into sewage farm, and serious impact is caused to sewage farm.Burning method is to make sulfide under high temperature and normal pressure Oxidation generation sulfate, organic hydrocarbon compounds generation CO2 and H2O, sodium hydroxide are converted to sodium carbonate, sulfate and carbonate It remains dissolved in processed waste liquid.The method is easy to operate, can meet qualified discharge requirement.Shortcoming is that energy consumption is big, operating cost Height, cost of investment and simple wet oxidation device are similar.Wet air oxidation handles the high efficiency of pollutant due to it And completeness, become the typical technology that petrochemical industry spent lye is handled.This method is under high temperature, condition of high voltage, in air Oxygen for oxidant, organic pollution is oxidized to the inorganic matters such as CO2 and H2O or small organic molecule in the liquid phase.The method To more demanding (high temperature resistant, high pressure and the anti-corrosion) of equipment, investment is larger, and energy consumption is larger, and limited to the removal rate of COD.
For spent lye, the treatment process of most mainstream is " wet air oxidation+neutralization+evaporation and concentration " at present, the technique There are following problems:1st, wet air oxidation is limited to the removal rate of COD, causes to enter evaporation concentration system after neutralizing COD seriously affects the operation of evaporator to higher;2nd, since system is limited to the removal effect of COD, lead to the sodium sulphate of output Salt content of organics is excessively high, is disposed as danger, non-recovery value;3rd, energy-recuperation system is not perfect, wastes a large amount of reaction heat, Cause operating cost excessively high.
Utility model content
For this purpose, one of the utility model is designed to provide a kind of efficient, energy saving, high quality spent lye processing system System.
The utility model provides a kind of system for spent lye processing, including:Circulating cooling water unit and connect successively The catalytic wet oxidation unit connect neutralizes pool unit, electrolytic oxidation unit, evaporative crystallization unit, low-temperature evaporation crystalline element, institute Circulating cooling water unit is stated to steam with the catalytic wet oxidation unit, electrolytic oxidation unit, evaporative crystallization unit and low temperature respectively Hair crystalline element is connected.
Further, the catalytic wet oxidation unit includes catalytic wet oxidation preheater, catalytic wet oxidation reaction Device, the first recuperator, knockout drum and the second recuperator;The catalytic wet oxidation preheater, the first energy Recover and the second recuperator are double-tube heat exchanger, wherein, the output of the inner tube of the catalytic wet oxidation preheater Mouthful be connected with the input port of the wet catalytic oxidation reactor, the delivery outlet of the wet catalytic oxidation reactor with it is described wet The input port of the outer tube of formula catalysis oxidation preheater is connected, the delivery outlet of the outer tube of the catalytic wet oxidation preheater with it is described The input port of the outer tube of first recuperator is connected, the delivery outlet of the outer tube of first recuperator and second energy The input port for measuring the outer tube of recover is connected, the input port of the inner tube of first recuperator and second energy regenerating The delivery outlet of the outer tube of device is connected, the delivery outlet of the inner tube of first recuperator and the input port of the knockout drum It is connected, the inner tube of second recuperator is connected with the circulating cooling water unit, and the liquid of the knockout drum is defeated It exports and is connected with the input port for neutralizing pool unit, the knockout drum also has gas discharge outlet.
Further, the input port of the inner tube of the catalytic wet oxidation preheater is connected with booster pump and air compression Machine.
Further, the neutralization pool unit includes neutralization pond, has dasher and the concentrated sulfuric acid in the neutralization pond Automatic medicament feeding system.
Further, the electrolytic oxidation unit use continous way electrolytic oxidation reaction device, including retort, circulating pump and Oxidizing electrode, the waste liquid in the retort are flowed through under the action of the circulating pump after oxidation reaction occurs for the oxidizing electrode The retort is returned, the retort is equipped with inlet and outlet, the water inlet of the retort and the neutralization pond The delivery outlet of unit is connected, and the water outlet of the retort is connected with the input port of the evaporative crystallization unit.
Further, the evaporative crystallization unit includes evaporative crystallization preheater and crystallizing evaporator, the evaporative crystallization Preheater is double-tube heat exchanger, and the input port of the inner tube of the evaporative crystallization preheater is connected with the water outlet of the retort, The delivery outlet of the inner tube of the evaporative crystallization preheater is connected with the input port of the crystallizing evaporator, the evaporative crystallization utensil There are condensed water discharge outlet, salt outlet, outlet port and mother liquor outlet, the mother liquor outlet and the low-temperature evaporation knot The input port of brilliant unit is connected.
Further, the low-temperature evaporation crystalline element includes low-temperature evaporation crystallizer, the low-temperature evaporation crystallizer Mother liquor input port is connected with the mother liquor outlet of the crystallizing evaporator, the hot gas input port of the low-temperature evaporation crystallizer and institute It states circulating cooling water unit to be connected, the low-temperature evaporation crystalline element also has mixed salt outlet, tail gas outlet and condensed water Floss hole.
Further, the circulating cooling water unit includes coil heat exchanger and air cooler, the coil heat exchanger setting In the retort, the external water inlet in input port of the coil heat exchanger, the delivery outlet of the coil heat exchanger is worn successively It crosses the inner tube of second recuperator and the outer tube of the evaporative crystallization preheater is connected with the input port of the air cooler, The air cooler has cooling water outlet and heat outlet, and the hot gas of the heat outlet and the low-temperature evaporation crystallizer is defeated Entrance is connected.
This system is apparent to the removal effect of COD, and the COD that evaporative crystallization can be intake is controlled in the model less than 100mg/L It encloses, ensure that normal, the continuous operation of evaporative crystallization unit, while ensure that the purity of sodium sulfate salt.System by waste water almost High quality reuse water and high-quality sodium sulfate salt are fully converted to, there is certain economic benefit.System fully recycles oxidation reaction The waste heat generated with neutralization reaction, it is as the supplemental heat of evaporative crystallization unit and low-temperature evaporation crystalline element, it can be achieved that whole Heat self-balancing in a system greatly reduces operation consumption.
The utility model additionally provides a kind of method of spent lye processing, is for what spent lye was handled using above-mentioned System, including:
Spent lye enters catalytic wet oxidation unit, enters catalytic wet oxidation after the preheating of catalytic wet oxidation preheater Catalytic oxidation occurs in reactor, the spent lye after the completion of reacting passes sequentially through catalytic wet oxidation preheater, the first energy Amount recover and recuperator two carry out heat exchange cooling, subsequently enter gas-liquid separator and carry out gas-liquid separation;
The water outlet of gas-liquid separator enters neutralization pond, and the concentrated sulfuric acid is added to neutralization pond, occurs neutralization reaction, in spent lye Alkali is neutralized, and is converted into sulfate;
The water outlet of neutralization pond enters electrolytic oxidation reaction device, and electrolytic oxidation reaction occurs;
The water outlet of electrolytic oxidation reaction device enters evaporative crystallization unit, by circulating cooling water unit using oxidation reaction and Heat is released in neutralization reaction, recycles sodium sulphate and condensed water;
The mother liquor of evaporative crystallization unit discharge enters low-temperature evaporation crystalline element, using the waste heat of circulating cooling water unit, Condensed water is recycled, generates mixed salt.
Further, a kind of method of spent lye processing is further included catalytic wet oxidation unit, evaporative crystallization list The exhaust gas of member and low-temperature evaporation crystalline element is passed through outer row after exhaust treatment system processing.
This method is apparent to the removal effect of COD, and the COD that evaporative crystallization can be intake is controlled in the model less than 100mg/L It encloses, ensure that normal, the continuous operation of evaporative crystallization unit, while ensure that the purity of sodium sulfate salt.By waste water almost High quality reuse water and high-quality sodium sulfate salt are converted into, there is certain economic benefit.Fully recycling oxidation reaction and neutralization is anti- The waste heat that should be generated, as the supplemental heat of evaporative crystallization unit and low-temperature evaporation crystalline element, it can be achieved that in whole system Heat self-balancing greatly reduces operation consumption.
The additional aspect and advantage of the utility model will be set forth in part in the description, partly will be from following description In become apparent or recognized by the practice of the utility model.
Description of the drawings
Fig. 1 is a kind of structure diagram of system for spent lye processing of the utility model embodiment.
In attached drawing label for:
1 catalytic wet oxidation preheater
2 wet catalytic oxidation reactors
3 first recuperators
4 knockout drums
41 gas discharge outlets
5 second recuperators
6 neutralization ponds
7 electrolytic oxidation reaction devices
8 evaporative crystallization preheaters
9 air coolers
91 cooling water outlets
92 heat outlets
10 crystallizing evaporators
101 condensed water discharge outlets
102 salt outlets
103 outlet ports
104 mother liquor outlets
11 low-temperature evaporation crystallizers
111 mixed salt outlets
112 tail gas outlets
113 condensate drain outlets
Specific embodiment
The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that the utility model Limitation.
The utility model embodiment provides a kind of system for spent lye processing, as shown in Figure 1, including:It recycles cold But water unit and sequentially connected catalytic wet oxidation unit, neutralization pool unit, electrolytic oxidation unit, evaporative crystallization unit are low Warm evaporative crystallization unit, the circulating cooling water unit respectively with the catalytic wet oxidation unit, electrolytic oxidation unit, evaporation Crystalline element is connected with low-temperature evaporation crystalline element.
In the one side of the utility model embodiment, the catalytic wet oxidation unit is preheated including catalytic wet oxidation Device 1, wet catalytic oxidation reactor 2, the first recuperator 3,4 and second recuperator 5 of knockout drum;The wet type Catalysis oxidation preheater 1, the first recuperator 3 and the second recuperator 5 are double-tube heat exchanger, wherein, the wet type The delivery outlet of the inner tube of catalysis oxidation preheater 1 is connected with the input port of the wet catalytic oxidation reactor 2, and the wet type is urged The delivery outlet of oxidation device 2 is connected with the input port of the outer tube of the catalytic wet oxidation preheater 1, the catalytic wet The delivery outlet for aoxidizing the outer tube of preheater 1 is connected with the input port of the outer tube of first recuperator 3, first energy The delivery outlet of the outer tube of recover 3 is connected with the input port of the outer tube of second recuperator 5, first energy regenerating The input port of the inner tube of device 3 is connected with the delivery outlet of the outer tube of second recuperator 5, first recuperator 3 The delivery outlet of inner tube be connected with the input port of the knockout drum 4, the inner tube of second recuperator 5 is followed with described Ring cooling water unit is connected, and the liquid outlet of the knockout drum 4 is connected with the input port for neutralizing pool unit, described Knockout drum 4 also has gas discharge outlet 41.Optionally, the input port of the inner tube of the catalytic wet oxidation preheater 1 connects It is connected to booster pump and air compressor.Preferably, the wet catalytic oxidation reactor 2 be fixed bed reactors, catalytic wet Oxidation unit uses the noble metal system proprietary catalysts using TiO2 as carrier, can refer to the patent of the patent No. 201202241027.
When specifically used, the operation temperature of wet catalytic oxidation reactor 2 is 200~300 DEG C, operating pressure for 1.5~ 10MPa, reaction time are 10min~2h.The oxidation process occurred in reactor includes thermal decomposition, selective oxidation and complete oxidation Three phases.Following oxidative decomposition mainly occurs for catalytic wet oxidation process:
1) Na2S is aoxidized
2S2-+2O2+H2O→S2O32-+2OH-
S2O32-+2O2+2OH-→2SO42-+H2O
2) hydrogen sulfide, organic sulfur compound oxidation, such as:
H2S+2O2→H2SO4
3) organic matter (carbohydrate, BOD, COD) aoxidizes, such as:
CH3COOH+2O2→2CO2+2H2O
In the one side of the utility model embodiment, the neutralization pool unit includes neutralization pond 6, in the neutralization pond 6 With dasher and concentrated sulfuric acid automatic medicament feeding system.
When specifically used, waste liquid residence time in neutralization pond 6 is more than 0.5h, sets concentrated sulfuric acid automatic medicament feeding system, if Put dasher.Acid-base neutralization reaction occurs, has a large amount of heat with releasing:
1) NaOH is neutralized
2NaOH+H2SO4→Na2SO4+2H2O
2nd, Na2CO3 reacts
Na2CO3+H2SO4→Na2SO4+2H2O+CO2
In the one side of the utility model embodiment, the electrolytic oxidation unit uses continous way electrolytic oxidation reaction device 7, including retort, circulating pump and oxidizing electrode, the waste liquid in the retort flows through described under the action of the circulating pump Oxidizing electrode returns the retort after oxidation reaction occurs, and the retort is equipped with inlet and outlet, the reaction The water inlet of tank is connected with the delivery outlet for neutralizing pool unit, the water outlet of the retort and the evaporative crystallization unit Input port is connected.Specifically, diamond alloy electrode can be used in oxidizing electrode, diamond alloy electrode operating voltage is 6-24V direct currents Electricity, current density are 1000-100000A/ ㎡.
In the one side of the utility model embodiment, the evaporative crystallization unit includes evaporative crystallization preheater 8 and steams Send out crystallizer 10, the evaporative crystallization preheater 8 be double-tube heat exchanger, the input port of the inner tube of the evaporative crystallization preheater 8 It is connected with the water outlet of the retort, the delivery outlet of the inner tube of the evaporative crystallization preheater 8 and the crystallizing evaporator 10 Input port be connected, the crystallizing evaporator 10 have condensed water discharge outlet 101, salt outlet 102,103 He of outlet port Mother liquor outlet 104, the mother liquor outlet 104 are connected with the input port of the low-temperature evaporation crystalline element.Optionally, it is described Evaporative crystallization preheater can also be plate heat exchanger, and material is not less than 316L.The crystallizing evaporator 10 is using hot method evaporation knot Crystalline substance, evaporating temperature is 50-100 DEG C, and is equipped with automatic packaging system.
In the one side of the utility model embodiment, the low-temperature evaporation crystalline element includes low-temperature evaporation crystallizer 11, the mother liquor input port of the low-temperature evaporation crystallizer 11 is connected with the mother liquor outlet 104 of the crystallizing evaporator 10, described The hot gas input port of low-temperature evaporation crystallizer 11 is connected with the circulating cooling water unit, and the low-temperature evaporation crystalline element also has There are mixed salt outlet 111, tail gas outlet 112 and condensate drain outlet 113.The inside of the low-temperature evaporation crystallizer 11 is sieve Plate tower, tower bottom and top are respectively equipped with the inlet and outlet of hot-air, and the dense drain of tower reactor is delivered to the water distribution of tower top through circulating pump Device, with hot-air countercurrent flow, bottom of towe is equipped with mixed salt outlet, and exhaust gas discharges after processing.
In the one side of the utility model embodiment, the circulating cooling water unit includes coil heat exchanger 12 and air-cooled Device 9, the coil heat exchanger 12 are arranged in the retort, the external water inlet in input port of the coil heat exchanger 12, institute The delivery outlet for stating coil heat exchanger 12 sequentially passes through the inner tube of second recuperator 5 and the evaporative crystallization preheater 8 Outer tube be connected with the input port of the air cooler 9, the air cooler 9 have cooling water outlet 91 and heat outlet 92, institute The hot gas input port that heat outlet 92 is stated with the low-temperature evaporation crystallizer 11 is connected.The setting of circulating cooling water unit makes system Oxidation can be made full use of, the heat that neutralization reaction generates is collected and crystallized as evaporative crystallization unit and low-temperature evaporation The supplemental heat of unit is, it can be achieved that heat self-balancing in whole system.
The utility model embodiment additionally provides a kind of method of spent lye processing, is handled using above-mentioned for spent lye System, including:
Spent lye enters catalytic wet oxidation unit, enters catalytic wet oxygen after the preheating of catalytic wet oxidation preheater 1 To change in reactor 2 and catalytic oxidation occurs, the spent lye after the completion of reacting passes sequentially through catalytic wet oxidation preheater 1, the One recuperator 3 and recuperator two carry out heat exchange cooling, subsequently enter gas-liquid separator and carry out gas-liquid separation;Wet type is urged Change overwhelming majority COD in the water outlet of oxidation unit to be removed, the reducing substances such as sulfide are oxidized to sulfate.
The water outlet of gas-liquid separator enters neutralization pond, and the concentrated sulfuric acid is added to neutralization pond, occurs neutralization reaction, in spent lye Alkali is neutralized, and is converted into sulfate.
The water outlet of neutralization pond enters electrolytic oxidation reaction device 7, and electrolytic oxidation reaction occurs;The step further removes COD, COD is controlled in the acceptable range of crystallizing evaporator.
The water outlet of electrolytic oxidation reaction device 7 enters evaporative crystallization unit, and oxidation reaction is utilized by circulating cooling water unit Heat is released with neutralization reaction, recycles sodium sulphate and condensed water.
The mother liquor of evaporative crystallization unit discharge enters low-temperature evaporation crystalline element, using the waste heat of circulating cooling water unit, Condensed water is recycled, generates mixed salt.
In the one side of the utility model embodiment, by catalytic wet oxidation unit, evaporative crystallization unit and low temperature steam The exhaust gas of hair crystalline element is passed through outer row after exhaust treatment system processing.
In a specific embodiment of the utility model, using the utility model processing system as described above and side Method handles certain petro-chemical corporation's spent lye, treatment scale 4000m3, in terms of year run time 8000h, i.e. 0.5m3/h, Water quality situation is as shown in table 1:
Certain the petro-chemical corporation's ethylene waste lye water quality of table 1
Project COD Ammonia nitrogen Salt
Unit mg/L mg/L mg/L
Numerical value 90300 6844 21978
Spent lye COD high, contains a certain amount of ammonia nitrogen;Salt content is high, and salinity contains part carbonic acid based on sodium sulphate Sodium and a small amount of vulcanized sodium;Containing certain density sodium hydroxide, basicity is high.Using the treatment process of the utility model, processing Process includes:
1) spent lye enters catalytic wet oxidation unit, enters catalytic wet oxygen after the preheating of catalytic wet oxidation preheater Change and catalytic oxidation occurs in reactor, reaction temperature is 270 DEG C, operating pressure 9MPa, reaction time 0.5h, reaction Heat exchange cooling is carried out by catalytic wet oxidation preheater, the first recuperator and the second recuperator respectively after the completion, It subsequently enters gas-liquid separator and carries out gas-liquid separation.At 40 DEG C or so, more than 98% COD is gone gas-liquid separator leaving water temperature It removes, sulfide etc. is oxidized to sulfate.
2) catalytic wet oxidation unit water outlet enters neutralization pond, adds the concentrated sulfuric acid to neutralization pond, neutralization reaction occurs, and goes out big The heat of amount.The neutralization pond residence time is 0.5h, equipped with dasher and concentrated sulfuric acid automatic medicament feeding system.During neutralization pond water outlet is aobvious Property.
3) neutralization pond water outlet enters electrolytic oxidation unit, and electrolytic oxidation reaction occurs, further removes COD.Electrolytic oxidation Unit includes retort 1, circulating pump 2 and oxidizing electrode 2, and wherein retort volume is 10 cubes, wherein equipped with coil pipe Heat exchanger, pump flow 40m3/ h, lift 30m.Electrolytic oxidation unit water outlet COD is less than 100mg/L.
4) electrolytic oxidation water outlet enters evaporative crystallization unit, is heat using the heat that oxidation reaction and neutralization reaction are released Sodium sulphate and condensed water are recycled in source;
5) a small amount of mother liquor enters low-temperature evaporation crystalline element, using system waste heat, recycles condensed water, generates mixed salt;
6) catalytic wet oxidation, evaporative crystallization, low-temperature evaporation crystalline element exhaust gas enter exhaust treatment system, at exhaust gas Reason system includes waste gas collecting system, pre- wash pool and biofilter, and exhaust gas is outer after processing is up to standard to be arranged.
Although the embodiment of the utility model has been shown and described above, it is to be understood that above-described embodiment is Illustratively, it is impossible to be construed as a limitation of the present invention, those of ordinary skill in the art are in the scope of the utility model It is interior to make changes, modifications, substitutions and variations to the above described embodiments.

Claims (8)

1. a kind of system for spent lye processing, which is characterized in that including:
Sequentially connected catalytic wet oxidation unit neutralizes pool unit, electrolytic oxidation unit, evaporative crystallization unit, low-temperature evaporation Crystalline element;
Circulating cooling water unit is further included, the circulating cooling water unit with the catalytic wet oxidation unit, is electrolysed oxygen respectively Change unit, evaporative crystallization unit is connected with low-temperature evaporation crystalline element.
A kind of 2. system for spent lye processing as described in claim 1, which is characterized in that the catalytic wet oxidation list Member includes catalytic wet oxidation preheater, wet catalytic oxidation reactor, the first recuperator, knockout drum and the second energy Measure recover;
The catalytic wet oxidation preheater, the first recuperator and the second recuperator are double-tube heat exchanger, wherein, The delivery outlet of the inner tube of the catalytic wet oxidation preheater is connected with the input port of the wet catalytic oxidation reactor, described The delivery outlet of wet catalytic oxidation reactor is connected with the input port of the outer tube of the catalytic wet oxidation preheater, the wet type The delivery outlet of the outer tube of catalysis oxidation preheater is connected with the input port of the outer tube of first recuperator, first energy The delivery outlet for measuring the outer tube of recover is connected with the input port of the outer tube of second recuperator, first energy regenerating The input port of the inner tube of device is connected with the delivery outlet of the outer tube of second recuperator, first recuperator it is interior The delivery outlet of pipe is connected with the input port of the knockout drum, inner tube and the circulating cooling of second recuperator Water unit is connected, and the liquid outlet of the knockout drum is connected with the input port for neutralizing pool unit, the gas-liquid point Also there is gas discharge outlet from tank.
3. a kind of system for spent lye processing as claimed in claim 2, which is characterized in that the catalytic wet oxidation is pre- The input port of the inner tube of hot device is connected with booster pump and air compressor.
4. a kind of system for spent lye processing as claimed in claim 2, which is characterized in that the neutralization pool unit includes Neutralization pond has dasher and concentrated sulfuric acid automatic medicament feeding system in the neutralization pond.
5. a kind of system for spent lye processing as claimed in claim 4, which is characterized in that the electrolytic oxidation unit is adopted With continous way electrolytic oxidation reaction device, including retort, circulating pump and oxidizing electrode, the waste liquid in the retort is followed described It is flowed through under the action of ring pump after oxidation reaction occurs for the oxidizing electrode and returns the retort, the retort is equipped with water inlet Mouth and water outlet, the water inlet of the retort are connected with the delivery outlet for neutralizing pool unit, the water outlet of the retort It is connected with the input port of the evaporative crystallization unit.
A kind of 6. system for spent lye processing as claimed in claim 5, which is characterized in that the evaporative crystallization unit packet Evaporative crystallization preheater and crystallizing evaporator are included, the evaporative crystallization preheater is double-tube heat exchanger, the evaporative crystallization preheating The input port of the inner tube of device is connected with the water outlet of the retort, the delivery outlet of the inner tube of the evaporative crystallization preheater and institute The input port for stating crystallizing evaporator is connected, the crystallizing evaporator have condensed water discharge outlet, salt outlet, outlet port and Mother liquor outlet, the mother liquor outlet are connected with the input port of the low-temperature evaporation crystalline element.
7. a kind of system for spent lye processing as claimed in claim 6, which is characterized in that the low-temperature evaporation crystallization is single Member includes low-temperature evaporation crystallizer, and the mother liquor input port of the low-temperature evaporation crystallizer is discharged with the mother liquor of the crystallizing evaporator Mouth is connected, and the hot gas input port of the low-temperature evaporation crystallizer is connected with the circulating cooling water unit, the low-temperature evaporation knot Brilliant unit also has mixed salt outlet, tail gas outlet and condensate drain outlet.
A kind of 8. system for spent lye processing as claimed in claim 7, which is characterized in that the circulating cooling water unit Including coil heat exchanger and air cooler, the coil heat exchanger is arranged in the retort, the input of the coil heat exchanger The external water inlet of mouth, the delivery outlet of the coil heat exchanger sequentially pass through the inner tube of second recuperator and the evaporation The outer tube of crystallization preheater is connected with the input port of the air cooler, and there is the air cooler cooling water outlet and hot gas to go out Mouthful, the heat outlet is connected with the hot gas input port of the low-temperature evaporation crystallizer.
CN201721539979.5U 2017-11-16 2017-11-16 A kind of system for spent lye processing Active CN207468391U (en)

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