CN108996523B - Separation and purification system for desulfurization wastewater - Google Patents
Separation and purification system for desulfurization wastewater Download PDFInfo
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- CN108996523B CN108996523B CN201710423039.8A CN201710423039A CN108996523B CN 108996523 B CN108996523 B CN 108996523B CN 201710423039 A CN201710423039 A CN 201710423039A CN 108996523 B CN108996523 B CN 108996523B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/10—Bromides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
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Abstract
The invention discloses a separation and purification system for desulfurization wastewater. The system comprises: the device comprises a preheater, a two-effect evaporator, a two-effect separator, a one-effect evaporator, a one-effect separator, a first solid-liquid separator, a cooling crystallization tank and a second solid-liquid separator. The separation and purification system for the desulfurization wastewater not only obtains NaBr and Na through countercurrent double-effect evaporation treatment and purification 2 SO 4 The system takes desulfurization waste liquid as a raw material, has no raw material cost, does not need to add any other additive or catalyst in the production process, can recycle the liquid generated in the extraction process in the system, does not generate three wastes, and has little environmental pollution.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to a separation and purification system for desulfurization wastewater.
Background
For the safety of electrical equipment, a flame retardant is generally added into a circuit board to ensure that the material reaches a certain flame retardant level and reduce the occurrence of fire accidents. Most of flame retardants used in the circuit board manufacturing industry are brominated epoxy resins and tetrabromobisphenol A type reactive bromine-containing flame retardants. In view of environmental and health risks, china has restricted polybrominated biphenyls and polybrominated diphenyl ethers in the electronic information product pollution control management method. However, brominated flame retardants are not fully disabled. In addition to the above-mentioned varieties, brominated flame retardants are still widely used in countries around the world. Therefore, the desulfurization wastewater of the domestic technology for treating the waste circuit boards by adopting the pyrogenic process mainly contains a certain amount of NaBr and Na 2 SO 4 . More than 30% of NaBr has recovery value. If NaBr is extracted from desulfurization waste liquid, on one hand, the salt concentration in the desulfurization liquid can be reduced, and on the other hand, certain economic benefit can be created. But NaBr and Na are currently recovered from desulfurization wastewater 2 SO 4 The system has complex structure, high cost and low recovery rate.
Thereby, fromRecovery of NaBr and Na from desulfurization waste water 2 SO 4 The system of (a) is to be improved.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to propose a separation and purification system for desulfurization wastewater, which purifies NaBr and Na 2 SO 4 The system has high purity and recovery rate, the desulfurization waste liquid of the system is used as a raw material, the cost of the raw material is avoided, no other additives or catalysts are required to be added in the production process, the liquid generated in the extraction process can be recycled in the system, three wastes are not generated, and the environmental pollution is small.
According to one aspect of the present invention, there is provided a separation and purification system for desulfurization wastewater. According to an embodiment of the present invention, the separation and purification system for desulfurization wastewater includes:
the preheater is provided with a desulfurization wastewater inlet and a preheated desulfurization wastewater outlet;
the secondary evaporator is provided with a preheated desulfurization wastewater inlet, a primary output steam inlet, a heat supply secondary non-condensable steam outlet, a secondary vapor-liquid outlet and a secondary condensate water outlet, and the preheated desulfurization wastewater inlet is connected with the preheated desulfurization wastewater outlet;
the second-effect separator is provided with a second-effect vapor-liquid inlet, a second-effect vapor outlet, a separated second-effect evaporated liquid outlet and a second-effect solution outlet, wherein the second-effect vapor-liquid inlet is connected with the second-effect vapor-liquid outlet, and the separated second-effect evaporated liquid outlet is connected with the preheated desulfurization wastewater inlet;
the first-effect evaporator is provided with a second-effect solution inlet, a new steam inlet, a first-effect non-condensable steam outlet after heat supply, a first-effect steam-liquid outlet and a first-effect condensate outlet, wherein the second-effect solution inlet is connected with the second-effect solution outlet;
the first-effect separator is provided with a first-effect vapor-liquid inlet, a first-effect vapor outlet, a separated first-effect evaporated liquid outlet and a first-effect saturated solution outlet, wherein the first-effect vapor-liquid inlet is connected with the first-effect vapor-liquid outlet, the first-effect vapor outlet is connected with the first-effect produced vapor inlet, and the separated first-effect evaporated liquid outlet is connected with the second-effect solution inlet;
the first solid-liquid separator is provided with an effective saturated solution inlet, a first solid outlet and a first mother liquor outlet, and the effective saturated solution inlet is connected with the effective saturated solution outlet;
the cooling crystallization tank is provided with a first mother liquor inlet and a crystallized slurry outlet, and the first mother liquor inlet is connected with the first mother liquor outlet; and
the second solid-liquid separator is provided with a slurry inlet after crystallization, a second solid outlet and a second mother liquor outlet, the slurry inlet after crystallization is connected with the slurry outlet after crystallization, and the second mother liquor outlet is connected with the second-effect solution inlet.
According to the separation and purification system for the desulfurization wastewater, naBr and Na are obtained through countercurrent double-effect evaporation treatment 2 SO 4 The system takes desulfurization waste liquid as a raw material, has no raw material cost, does not need to add any other additive or catalyst in the production process, can recycle the liquid generated in the extraction process in the system, does not generate three wastes, and has little environmental pollution.
In addition, the separation and purification system for desulfurization wastewater according to the above embodiment of the present invention may have the following additional technical features:
according to an embodiment of the invention, the system further comprises: the water collecting tank is provided with a water collecting inlet and a water collecting outlet, and the water collecting outlet is connected with the desulfurization wastewater inlet of the preheater.
According to an embodiment of the invention, the system further comprises: the stirring tank is provided with a feed inlet, a pretreatment liquid inlet and a post-precipitation liquid outlet; the filter press is provided with a post-precipitation liquid inlet, a filter residue outlet and a filtrate outlet, and the post-precipitation liquid inlet is connected with the post-precipitation liquid outlet; the water collection pit is provided with a filtrate inlet and a filtrate outlet, the filtrate inlet is connected with the filtrate outlet, and the filtrate outlet is connected with the desulfurization wastewater inlet of the preheater.
According to an embodiment of the invention, the system further comprises: and the pH regulator is connected with a filtrate outlet of the filter press and is used for regulating the pH value of the filtrate to 6-8.
According to an embodiment of the invention, the filter press is a plate and frame filter press.
According to an embodiment of the invention, the system further comprises: the first water storage tank is connected with the preheater and the first-effect evaporator through a first-effect non-condensable steam outlet after heat supply; and the second water storage tank is connected with the preheater.
According to an embodiment of the invention, the system further comprises: the condenser is provided with a two-effect steam inlet, a condensate water inlet and a condensate water outlet, the two-effect steam inlet is connected with the two-effect steam outlet, and the third water storage tank is connected with the condensate water outlet of the condenser.
According to an embodiment of the present invention, the two-effect evaporator further includes: the two-effect temperature control piece is arranged in the two-effect evaporator and is used for controlling the evaporation temperature of the two-effect evaporator to be 60-70 ℃; the two-effect pressure control piece is arranged in the two-effect evaporator and is used for controlling the evaporation pressure of the two-effect evaporator to be 20-30kPa.
According to an embodiment of the present invention, the one-effect evaporator further includes: the first-effect temperature control piece is arranged in the first-effect evaporator and is used for controlling the evaporation temperature of the first-effect evaporator to be 95-105 ℃; and the one-effect pressure control part is arranged in the one-effect evaporator and is used for controlling the evaporation pressure of the one-effect evaporator to be 70-80kPa.
According to an embodiment of the invention, the system further comprises: the first mother liquor tank is respectively connected with a first mother liquor outlet of the first solid-liquid separator and a first mother liquor inlet of the cooling crystallization tank; the second mother liquor tank is respectively connected with a second mother liquor outlet of the second solid-liquid separator and a second-effect solution inlet of the first-effect evaporator.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 shows a schematic configuration of a separation and purification system for desulfurization wastewater according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
It should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. Further, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
According to one aspect of the present invention, there is provided a separation and purification system for desulfurization wastewater. Referring to fig. 1, an explanation will be given of the separation and purification system of desulfurization wastewater according to an embodiment of the present invention, the system comprising: a preheater 100, a two-effect evaporator 200, a two-effect separator 300, a one-effect evaporator 400, a one-effect separator 500, a first solid-liquid separator 600, a cooling crystallization tank 700, and a second solid-liquid separator 800.
According to the separation and purification system for the desulfurization wastewater, naBr and Na are obtained through countercurrent double-effect evaporation treatment 2 SO 4 The system has high purity and recovery rate, the desulfurization waste liquid of the system is used as a raw material, the cost of the raw material is avoided, no other additives or catalysts are required to be added in the production process, the liquid generated in the extraction process can be recycled in the system, three wastes are not generated, and the environmental pollution is small.
In order to facilitate understanding of the separation and purification system of the desulfurization wastewater, explanation will be given to each device of the system:
preheater 100: according to an embodiment of the present invention, the preheater 100 has a desulfurization waste water inlet and a post-preheating desulfurization waste water outlet. Therefore, the preheated desulfurization liquid is easier to evaporate in the two-effect evaporator, and energy is saved.
According to some embodiments of the present invention, the preheater 100 is a heat exchanger, specifically, a plate heat exchanger, and uses the liquefied water of the first-effect steam discharged from the first-effect evaporator as a heat source for heat exchange.
According to some embodiments of the invention, the system further comprises: the first water storage tank 900 and the second water storage tank 1000, wherein, the first water storage tank 900 is connected with the preheater 100 and the first-effect non-condensable steam outlet of the first-effect evaporator 400 after heat supply, is used for storing the first-effect steam liquefied water discharged by the first-effect evaporator and conveying the first-effect steam liquefied water to the preheater 100 as a heat source for heat exchange, and the second water storage tank 1000 is connected with the preheater 100 and is used for collecting the cooling water after heat exchange, and the cooling water can be used as softened water to return to the waste heat boiler.
According to an embodiment of the invention, the system further comprises: a sump 1100, the sump 1100 having a water collection inlet and a water collection outlet, wherein the water collection outlet is connected to the desulfurization waste water inlet of the preheater for continuously and stably transporting desulfurization waste water into the preheater, and maintaining the system in a stable operation state.
According to an embodiment of the invention, the system further comprises: the stirring tank 1200, the filter press 1300 and the sump 1900, wherein the stirring tank 1200 is provided with a feed inlet, a pretreatment liquid inlet and a post-precipitation liquid outlet, and because the desulfurization wastewater contains a large amount of fluoride ions and calcium ions, lime milk and sodium carbonate can be added through the feed inlet to precipitate the fluoride ions and the calcium ions to generate calcium fluoride and calcium carbonate, so that the fluoride and calcium impurities in the desulfurization wastewater are removed, the concentration of the calcium ions is not higher than 100mg/L, scaling in the system is avoided, the concentration of the fluoride ions is not higher than 20mg/L, and corrosion in the system is avoided; the filter press has a post-precipitation liquid inlet connected to the post-precipitation liquid outlet for removing the filter residues in the post-precipitation liquid, a filter residue outlet connected to the filtrate inlet, and a filtrate outlet connected to the desulfurization waste water inlet of the preheater 100 for collecting the filtrate and stably transferring the filtrate to the preheater at a certain flow rate for preheating.
According to an embodiment of the invention, the system further comprises: a pH adjuster (not shown) is connected to the filtrate outlet of the filter press 1300 for adjusting the pH of the filtrate to 6-8. If the filtrate is too acidic and too basic, the subsequent equipment is damaged, and the pH value of the filtrate with the pH value of 6-8 is small, so that the subsequent equipment is little damaged. According to an embodiment of the invention, the bromine content of the desulfurization wastewater is >1.5g/L. Therefore, the desulfurization wastewater has high bromine content, and is favorable for recycling bromine.
According to an embodiment of the invention, the filter press is a plate and frame filter press. Therefore, the filter pressing efficiency is high, and the effect is good.
Two-effect evaporator 200: according to an embodiment of the present invention, the two-effect evaporator 200 has a pre-heated desulfurization waste water inlet, a first-effect output steam inlet, a heat-supply second-effect non-condensable steam outlet, a second-effect vapor-liquid outlet and a second-effect condensed water outlet, wherein the pre-heated desulfurization waste water inlet is connected with the pre-heated desulfurization waste water outlet and is used for heating, evaporating and concentrating desulfurization waste water, so that sodium sulfate in the second-effect vapor-liquid is nearly saturated and is easy to separate out. In addition, the two-effect evaporator 200 uses steam as a heat source to heat, and the steam can be derived from the steam separated by the one-effect separator, so that the cost is reduced, and the comprehensive utilization of the steam in the system is realized.
According to an embodiment of the present invention, the dual effect evaporator 200 further includes: a two-effect temperature control member and a two-effect pressure control member (not shown in the figure), wherein the two-effect temperature control member is arranged in the two-effect evaporator 200, and the two-effect temperature control member is used for controlling the evaporation temperature of the two-effect evaporator to be 60-70 ℃; a two-effect pressure control is also provided within the two-effect evaporator 200 for controlling the evaporation pressure of the two-effect evaporator to 20-30kPa. The evaporation temperature and the pressure need to be adjusted and set according to the components and the proportion of the salt in the desulfurization wastewater, the lower the evaporation pressure is, the lower the evaporation temperature of the salt is, the evaporation is carried out by the double-effect evaporator under the conditions, the evaporation effect is good, the efficiency is high, the evaporation condition is matched with the equipment performance, and the energy-saving control is convenient.
Two-effect separator 300: according to the embodiment of the invention, the two-effect separator is provided with a two-effect vapor-liquid inlet, a two-effect vapor outlet, a separated two-effect evaporated liquid outlet and a two-effect solution outlet, wherein the two-effect vapor-liquid inlet is connected with the two-effect vapor-liquid outlet, the separated two-effect evaporated liquid outlet is connected with the preheated desulfurization wastewater inlet and is used for vapor-liquid separation treatment on the two-effect vapor-liquid, and the separated liquid is returned to the two-effect evaporator for repeated heating, evaporation and concentration, so that desulfurization wastewater is continuously circulated between the two-effect evaporator and the two-effect separator until sodium sulfate in the liquid is saturated and separated out, and sodium sulfate is primarily recovered.
According to an embodiment of the invention, the system further comprises: a condenser 1400 and a third water storage tank 1500, the condenser 1400 having a steam inlet and a condensate outlet, wherein the steam inlet is connected to the two-effect steam outlet for condensing and recovering the two-effect steam, the third water storage tank 1500 is connected to the condensate outlet of the condenser 1400 for storing condensate water, the stored condensate water can be pumped out by a condensate pump and drained away as make-up water for the circulating water, and a portion of the gas that the condenser cannot condense is pumped out of the holding device vacuum by a vacuum pump.
An efficient evaporator 400: according to the embodiment of the invention, the first-effect evaporator 400 is provided with a second-effect solution inlet, a new steam inlet, a first-effect non-condensable steam outlet after heat supply, a first-effect steam-liquid outlet and a first-effect condensed water outlet, wherein the second-effect solution inlet is connected with the second-effect solution outlet, and the second-effect saturated solution is heated, evaporated and concentrated again, so that sodium bromide with higher solubility in the second-effect saturated solution is close to saturation and is easy to separate out. Meanwhile, the one-effect evaporator 400 also uses steam as a heat source for heating, and the steam can be derived from waste steam discharged in industrial production, so that the cost is reduced, and the comprehensive utilization of energy is realized.
According to an embodiment of the present invention, the one-effect evaporator 400 further includes: an effective temperature control member and an effective pressure control member (not shown), wherein the effective temperature control member is disposed in the effective evaporator 400, and the effective temperature control member is used to control the evaporation temperature of the effective evaporator 400 to be 95-105 ℃; an effective pressure control member for controlling the evaporation pressure of the effective evaporator 400 to 70-80kPa is also provided in the effective evaporator 400. Therefore, the temperature and the pressure of the first-effect evaporator are controlled by the first-effect temperature control piece and the first-effect pressure control piece, so that the temperature and the pressure of the first-effect evaporator are higher than those of the second-effect evaporator, the water in the solution is further evaporated, sodium bromide is more fully separated out, and the recovery rate of the sodium bromide is higher.
An effect separator 500: according to an embodiment of the present invention, the first-effect separator 500 has a first-effect vapor-liquid inlet, a first-effect vapor outlet, a separated first-effect evaporated liquid outlet, and a first-effect saturated solution outlet, wherein the first-effect vapor-liquid inlet is connected to the first-effect vapor-liquid outlet, the first-effect vapor outlet is connected to the first-effect produced vapor inlet, the separated first-effect evaporated liquid outlet is connected to the second-effect solution inlet, and is used for vapor-liquid separation of the first-effect vapor-liquid, and the separated liquid is returned to the first-effect evaporator to be repeatedly heated, evaporated, and concentrated, so that desulfurization wastewater is continuously circulated between the second-effect evaporator and the second-effect separator until sodium bromide in the liquid is saturated and separated out, thereby primarily recovering sodium bromide.
First solid-liquid separator 600: according to an embodiment of the present invention, the first solid-liquid separator 600 has an effective saturated solution inlet, a first solid outlet and a first mother liquor outlet, wherein the effective saturated solution inlet is connected to the effective saturated solution outlet, and is used for performing solid-liquid separation on the effective saturated solution, so that crystals mainly comprising sodium sulfate are separated out, sodium sulfate in the desulfurization waste liquid is recovered again, and the recovery rate of sodium sulfate is improved.
According to some embodiments of the invention, the first solid-liquid separator 600 is a centrifuge. Therefore, the solid-liquid separation has low cost, high efficiency and good effect.
According to some embodiments of the invention, the system further comprises: and a liquid storage tank 1700, wherein the liquid storage tank 1700 is respectively connected with the first solid-liquid separator 600, the first effective saturated solution outlet of the first effective separator 500 and the third water storage tank 1500, and is used for storing part of condensed water and the first effective saturated solution, and stably conveying the mixed solution of the first effective saturated solution and the condensed water to the first solid-liquid separator 600.
Cooling crystallization pot 700: according to an embodiment of the present invention, the cooling crystallization tank 700 has a first mother liquor inlet and a post-crystallization slurry outlet, wherein the first mother liquor inlet is connected to the first mother liquor outlet, and the solubility of sodium bromide is reduced by condensation crystallization due to the high solubility of sodium bromide, thereby promoting precipitation of sodium bromide.
According to some embodiments of the invention, the cooling crystallization tank 700 is cooled with a cooling water jacket and NaBr crystals are crystallized.
Second solid-liquid separator 800: according to an embodiment of the invention, the second solid-liquid separator has a post-crystallization slurry inlet connected to the post-crystallization slurry outlet, a second solids outlet, and a second mother liquor outlet connected to the second-effect solution inlet for separating sodium bromide based crystalline compounds from the post-crystallization slurry.
According to some embodiments of the invention, the first solid-liquid separator 600 and the second solid-liquid separator 800 are both centrifuges. Therefore, the solid-liquid separation efficiency is high, and the effect is good.
According to an embodiment of the invention, the system further comprises: a first mother liquor tank 1600 and a second mother liquor tank 1800, wherein the first mother liquor tank is respectively connected with a first mother liquor outlet of the first solid-liquid separator 600 and a first mother liquor inlet of the cooling crystallization tank 700, and is used for collecting the first mother liquor separated by the first solid-liquid separator 600 and supplying the first mother liquor to the cooling crystallization tank 700 for cooling crystallization; the second mother liquor tank 1800 is respectively connected with a second mother liquor outlet of the second solid-liquid separator 800 and a second-effect saturated solution inlet of the first-effect evaporator 400, and is used for collecting the second mother liquor separated by the second solid-liquid separator 800, returning the second mother liquor to the first-effect evaporator 400, and concentrating and evaporating the second mother liquor, so as to form a closed cycle in which the solution is continuously evaporated and crystallized.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and are not to be construed as limiting the invention.
Example 1
A certain smelting plant utilizes a pyrogenic process to treat a waste printed circuit board, and the desulfurization waste liquid generated after smelting flue gas passes through a desulfurization tower comprises the following components:
the desulfurization waste liquid contains a certain amount of bromide ions, and the concentration of fluoride ions is higher, and the separation and purification system for the desulfurization waste water is utilized to separate and purify the waste water, and the specific method is as follows:
(1) The desulfurization wastewater pretreatment process comprises the following steps:
desulfurization wastewater, defluorination reaction tank, defluorination sedimentation tank, calcium removal reaction tank, calcium removal sedimentation tank and double-effect evaporation equipment
Wherein, 10 percent lime milk solution is added into the defluorination reaction tank, and the subsequent treatment equipment is possibly scaled up in order to avoid the hardness of water quality, so 10 percent Na is added into the defluorination reaction tank 2 CO 3 The pH value of the waste liquid is regulated to about 7 by using hydrochloric acid in combination with 1.5mg/L PAM to obtain pretreated desulfurization waste water.
(2) Material circulation
The pretreated desulfurization wastewater is pumped to a plate-and-frame filter press for filtration by a filter press pump; the filtered wastewater is sent to a plate heat exchanger through a feed pump, preheated and then sent to a two-effect evaporator for heating, evaporation and concentration, wherein the evaporation temperature is about 65 ℃ and the evaporation pressure is about 25 kPa;
the concentrated solution of the two-effect evaporator is pumped out and sent to the one-effect evaporator under the action of a cascade pump, the evaporation temperature is about 100 ℃, and the evaporation pressure is about 75 kPa.
The concentrated solution in the first-effect evaporator enters a storage tank, and is concentrated and evaporated to Na in a certain concentration range 2 SO 4 Separating sodium sulfate material and mother liquor by a centrifuge;
the separated mother liquor is sent to a cooling crystallization tank, cooled by a cooling water jacket and crystallized to obtain NaBr crystals, and then sodium bromide materials and mother liquor are separated by a centrifuge;
the separated low-temperature mother liquor is sent to a one-effect evaporation circulation system for re-concentration and evaporation, thereby forming a closed circulation treatment system.
(2) Steam and condensed water flow
The main energy source for heating the two-effect evaporator and the one-effect evaporator is saturated new steam, the steam enters the shell side of the one-effect evaporator through a steam control valve, condensed water after heat exchange with materials is collected to a first condensed water tank through a drain valve to be used as a heat source of a plate heat exchanger, and the condensed water is collected to a second condensed water tank to be used as softened water for recycling to a waste heat boiler after being cooled by the plate heat exchanger;
the secondary steam evaporated by the first effect flows out of the top of the first effect separator to heat the second effect shell side, condensed water after condensation flows out of the bottom of the second effect evaporator and is collected into a third condensate water tank, the secondary steam evaporated by the second effect flows out of the top of the second effect separator and enters the condenser to be condensed, the condensed water after condensation is collected into the third condensate water tank and is pumped out by a condensate pump to be discharged as make-up water of circulating water; part of the gas which cannot be condensed is pumped out of the holding device vacuum by means of a vacuum pump.
Therefore, by utilizing the separation and purification system for the desulfurization wastewater, naBr and Na are obtained through countercurrent double-effect evaporation treatment 2 SO 4 The system has high purity and recovery rate, the desulfurization waste liquid of the system is used as a raw material, the cost of the raw material is avoided, no other additives or catalysts are required to be added in the production process, the liquid generated in the extraction process can be recycled in the system, three wastes are not generated, and the environmental pollution is small.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A system for separating and purifying desulfurization wastewater, comprising:
the preheater is provided with a desulfurization wastewater inlet and a preheated desulfurization wastewater outlet;
the secondary evaporator is provided with a preheated desulfurization wastewater inlet, a primary output steam inlet, a heat supply secondary non-condensable steam outlet, a secondary vapor-liquid outlet and a secondary condensate water outlet, and the preheated desulfurization wastewater inlet is connected with the preheated desulfurization wastewater outlet;
the second-effect separator is provided with a second-effect vapor-liquid inlet, a second-effect vapor outlet, a separated second-effect evaporated liquid outlet and a second-effect solution outlet, wherein the second-effect vapor-liquid inlet is connected with the second-effect vapor-liquid outlet, and the separated second-effect evaporated liquid outlet is connected with the preheated desulfurization wastewater inlet;
the first-effect evaporator is provided with a second-effect solution inlet, a new steam inlet, a first-effect non-condensable steam outlet after heat supply, a first-effect steam-liquid outlet and a first-effect condensate outlet, wherein the second-effect solution inlet is connected with the second-effect solution outlet;
the first-effect separator is provided with a first-effect vapor-liquid inlet, a first-effect vapor outlet, a separated first-effect evaporated liquid outlet and a first-effect saturated solution outlet, wherein the first-effect vapor-liquid inlet is connected with the first-effect vapor-liquid outlet, the first-effect vapor outlet is connected with the first-effect produced vapor inlet, and the separated first-effect evaporated liquid outlet is connected with the second-effect solution inlet;
the first solid-liquid separator is provided with an effective saturated solution inlet, a first solid outlet and a first mother liquor outlet, and the effective saturated solution inlet is connected with the effective saturated solution outlet;
the cooling crystallization tank is provided with a first mother liquor inlet and a crystallized slurry outlet, and the first mother liquor inlet is connected with the first mother liquor outlet; and
the second solid-liquid separator is provided with a slurry inlet after crystallization, a second solid outlet and a second mother liquor outlet, the slurry inlet after crystallization is connected with the slurry outlet after crystallization, the second mother liquor outlet is connected with the second-effect solution inlet,
the two-effect evaporator further comprises:
the two-effect temperature control piece is arranged in the two-effect evaporator and is used for controlling the evaporation temperature of the two-effect evaporator to be 60-70 ℃;
a two-effect pressure control member arranged in the two-effect evaporator and used for controlling the evaporation pressure of the two-effect evaporator to be 20-30kPa,
the one-effect evaporator further comprises:
the first-effect temperature control piece is arranged in the first-effect evaporator and is used for controlling the evaporation temperature of the first-effect evaporator to be 95-105 ℃;
and the one-effect pressure control part is arranged in the one-effect evaporator and is used for controlling the evaporation pressure of the one-effect evaporator to be 70-80kPa.
2. The system as recited in claim 1, further comprising:
the water collecting tank is provided with a water collecting inlet and a water collecting outlet, and the water collecting outlet is connected with the desulfurization wastewater inlet of the preheater.
3. The system as recited in claim 1, further comprising:
the stirring tank is provided with a feed inlet, a pretreatment liquid inlet and a post-precipitation liquid outlet;
the filter press is provided with a post-precipitation liquid inlet, a filter residue outlet and a filtrate outlet, and the post-precipitation liquid inlet is connected with the post-precipitation liquid outlet;
the water collection pit is provided with a filtrate inlet and a filtrate outlet, the filtrate inlet is connected with the filtrate outlet, and the filtrate outlet is connected with the desulfurization wastewater inlet of the preheater.
4. A system according to claim 3, further comprising:
and the pH regulator is connected with a filtrate outlet of the filter press and is used for regulating the pH value of the filtrate to 6-8.
5. A system according to claim 3, wherein the filter press is a plate and frame filter press.
6. The system as recited in claim 1, further comprising:
the first water storage tank is connected with the preheater and the first-effect evaporator through a first-effect non-condensable steam outlet after heat supply;
and the second water storage tank is connected with the preheater.
7. The system as recited in claim 1, further comprising:
the condenser is provided with a steam inlet and a condensate water outlet, and the steam inlet is connected with the two-effect steam outlet;
and the third water storage tank is connected with the condensed water outlet of the condenser.
8. The system as recited in claim 1, further comprising:
the first mother liquor tank is respectively connected with a first mother liquor outlet of the first solid-liquid separator and a first mother liquor inlet of the cooling crystallization tank;
the second mother liquor tank is connected with a second mother liquor outlet of the second solid-liquid separator and a second-effect solution inlet of the first-effect evaporator respectively.
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| CN110697815B (en) * | 2019-10-22 | 2020-09-04 | 武汉天空蓝环保科技有限公司 | Double-effect evaporator system |
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