CN212349844U - System for flying dust washing desalination unites high temperature melting to deal with - Google Patents

Abstract

The utility model relates to a system that flying dust washing desalination unites high temperature melting to deal with, wherein the system mainly includes: the system comprises a fly ash elution unit, an eluent purification unit, a drying unit, an evaporation salt-making unit and a high-temperature melting treatment unit, wherein an eluent outlet of the fly ash elution unit is connected with an inlet of the eluent purification unit, an outlet of the eluent purification unit is connected with an inlet of the evaporation salt-making unit, an elution ash outlet of the fly ash elution unit is connected with the drying unit, and an outlet of the drying unit is connected with the high-temperature melting treatment unit; the utility model adopts a special multistage countercurrent rinsing technology to remove chloride in fly ash to prepare industrial salt; melting the eluted ash to prepare a vitreous building material; the high-temperature flue gas is discharged after heat exchange and dust collection; the eluent is recycled after being treated, and zero emission is realized; the reduction, the resource utilization and the harmlessness of the fly ash treatment are realized.

Description

System for flying dust washing desalination unites high temperature melting to deal with

Technical Field

The utility model belongs to the innocent treatment and the resource utilization field of hazardous waste, concretely relates to system that flying dust washing desalination unites high temperature melting to deal with.

Background

Along with the development of economy and the improvement of the living standard of people, the garbage problem is increasingly prominent, and according to statistics, 2/3 in 668 cities in China are surrounded by garbage belts, namely 'garbage enclosing city'. The secondary pollution generated in the process of treating the garbage enables the 'garbage enclosure' to be evolved into 'dangerous waste enclosure', and the secondary pollution causes great harm to the living environment of people.

At present, the garbage disposal mode mainly comprises landfill and incineration. In terms of landfill, the garbage landfill not only occupies a large amount of land resources, but also can generate pollution harm to soil and underground water at any time like a bomb; although the reduction and resource treatment of the garbage are realized by the garbage incineration, a large amount of fly ash which is a toxic, harmful and difficultly-treated substance is still generated.

At present, fly ash is mainly treated by cement solidification or chemical stabilization, landfill and high-temperature stabilization. In terms of landfill, a large amount of land resources are required to be occupied, the long-term effect of the landfill has a large risk, and underground water and soil are easily polluted; with the increasing shortage of urban construction land and the increasing demand of ecological environment, the landfill treatment of waste incineration fly ash has been prohibited by various governments. The high-temperature stabilization treatment includes high-temperature sintering and high-temperature melting treatment, and the high-temperature stabilization treatment technology can remove harmful substances such as heavy metal, dioxin and the like in the fly ash at high temperature, and the slag can be used as materials for civil engineering, cement, buildings and the like. Therefore, the high-temperature stabilization treatment of fly ash has been a hot spot for research, application, and management, and has been widely used in developed countries such as the united states and germany.

Compared with European and American countries, the waste incineration fly ash in China has high content of soluble chloride salt, and the devices and pipelines which are easy to corrode are directly treated by high-temperature melting, so that the secondary fly ash generated by high-temperature melting is more difficult to treat. In view of the characteristic of high content of soluble chloride in fly ash in China, the fly ash needs to be pretreated for removing the soluble chloride before high-temperature stabilization treatment, so that the soluble chloride in the fly ash is removed.

SUMMERY OF THE UTILITY MODEL

The not enough to prior art, the utility model provides a system that flying dust washing desalination unites high temperature melting to deal with, with flying dust washing desalination technique and high temperature melting flying dust processing technique looks coupling, solved china's waste incineration flying dust in soluble chlorine salt content high, directly knot adopts high temperature melting to deal with perishable equipment and pipeline, the difficult problem of handling of the secondary flying dust that high temperature melting produced.

For solving one of above-mentioned problem at least, the utility model discloses a technical scheme who takes does:

the utility model provides a system that flying dust washing desalination unites high temperature melting to deal with, its characterized in that, flying dust elution unit's eluant export links to each other with eluant purification unit's entry, eluant purification unit's export links to each other with evaporation system salt unit entry, flying dust elution unit's elution ash export links to each other with drying unit, drying unit's export and high temperature melting are dealt with the unit and are linked to each other.

According to the utility model discloses an embodiment, flying dust elution unit includes blender, washing reactor, elution ash/liquid separator, the blender import links to each other with flying dust metering device export, water distribution metering device export respectively, the export of blender with the washing reactor links to each other, the export of washing reactor with elution ash/liquid separator import links to each other, elution ash/liquid separator's elution ash export with drying unit links to each other, elution ash/liquid separator's eluant export with eluant purification unit links to each other.

According to an embodiment of the present invention, the eluent purification unit includes a heavy metal removal reactor, a hardness removal reactor, a concentration precipitation device, a precipitate removal device, a multi-stage filtration device, and a Ph adjustment device, wherein an inlet of the heavy metal removal reactor is connected to an eluent outlet of the elution ash/liquid separator, an outlet of the heavy metal removal reactor is connected to the hardness removal reactor, an outlet of the hardness removal reactor is connected to an inlet of the precipitate removal device, a precipitate outlet of the precipitate removal device is connected to the water wash reactor, an eluent outlet of the precipitate removal device is connected to an inlet of the concentration precipitation device, an underflow outlet of the concentration precipitation device is connected to the hardness removal reactor, an overflow outlet of the concentration precipitation device is connected to an inlet of the multi-stage filtration device, and the outlet of the multi-stage filtering device is connected with the inlet of the Ph adjusting device, and the outlet of the Ph adjusting device is connected with the inlet of the evaporation salt making unit.

According to the embodiment of the utility model, evaporation salt manufacturing unit is including preheating heat exchanger, steam compressor, crystallization separator, stiff ware, enamel kettle, potassium salt centrifuge, potassium mother liquor jar, potassium mother liquor heat exchanger, sodium mother liquor jar, sodium salt centrifuge, forced circulation evaporator, vapour and liquid separator, falling film evaporator, distilled water jar, the export in evaporation water supply pond with it links to each other to preheat the heat exchanger, the export of preheating the heat exchanger with falling film evaporator links to each other, the export of falling film evaporator respectively with vapour and liquid separator, forced circulation evaporator link to each other, the export of vapour and liquid separator with steam compressor links to each other, steam compressor export respectively with falling film evaporator and forced circulation evaporator link to each other, the export of forced circulation evaporator with the crystallization separator export links to each other, the export of crystallization separator respectively with steam compressor, the export of vapor compressor, The thickener is connected with the sodium salt centrifugal machine and the enamel kettle respectively, an outlet of the sodium salt centrifugal machine is connected with the sodium mother liquor tank, an outlet of the enamel kettle is connected with the potassium salt centrifugal machine, the potassium salt centrifugal machine is connected with the potassium mother liquor tank, the potassium salt mother liquor tank is connected with the potassium mother liquor heat exchanger, and the forced circulation heat exchanger is connected with the sodium mother liquor tank and the potassium mother liquor heat exchanger respectively.

According to the utility model discloses an embodiment, glassware, washing flying dust desiccator, dry flying dust collector under dry unit includes washing flying dust conveyer, washing flying dust, the export of washing flying dust conveyer with the import of glassware links to each other under the washing flying dust, the export of glassware under the washing flying dust with the import of washing flying dust desiccator links to each other, the export of washing flying dust desiccator the import of dry flying dust collector links to each other, dry flying dust collector export links to each other with high temperature melting handles the unit.

According to the utility model discloses an embodiment, the unit is dealt with in high temperature melting includes dry flying ash lifting machine, goes into stove flying ash metering device, melting furnace, heat transfer device, gas cleaning device, dry flying ash lifting machine's export with it links to each other to go into stove flying ash metering device, the export of going into stove flying ash metering device with the melting furnace links to each other, the high temperature flue gas and the high temperature fluid export of high temperature melting furnace link to each other in heat transfer device respectively, heat transfer device's gas outlet with gas cleaning device links to each other.

From this, according to the utility model discloses a system that flying dust washing desalination was united high temperature melting was dealt with is through rinsing dechlorination technique and high temperature melting technique looks coupling, adopts the multistage rinsing technique against current of proprietary, and dechlorination effect is good, and water consumption is low, no raise dust. The method of alkaline elution and heavy metal multiple capture is adopted, so that the heavy metal and dioxin in the fly ash are transferred less; the MVR evaporation salt making technology is adopted, salt is produced as a byproduct, condensed water is recycled, energy consumption is low, and pollution is avoided; the fly ash is dried by adopting the fused product and the waste heat of high-temperature flue gas, so that energy is saved and emission is reduced; the high-temperature melting fly ash is adopted, heavy metals and dioxin are thoroughly treated, the method is safe and environment-friendly, no after-troubles exist, and the reduction, the recycling and the harmlessness of the waste incineration fly ash treatment are completely realized.

Additional aspects 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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic view of a fly ash elution unit and an eluent purification unit for the combined treatment of fly ash washing and desalting and high temperature melting.

FIG. 2 is a schematic diagram of an evaporation salt-making unit for the combined treatment of water washing and desalting of fly ash and high-temperature melting.

FIG. 3 is a schematic diagram of the drying unit and the calcining unit of the melting furnace for the combination of the water washing and desalting of the fly ash and the high temperature melting treatment.

FIG. 4 is a schematic view of the system flow of the flying ash washing desalination combined high temperature melting treatment of the present invention.

Wherein: a fly ash elution unit 100, a mixer 101, a water washing reactor 102, an elution ash/liquid separator 103, an elution liquid tank 104, an elution liquid purification unit 200, a heavy metal removal tank 201, a hardness removal reactor 202, a precipitate removal device 203, a concentration and precipitation device 204, a multi-stage filtration device 205, a Ph adjusting device 206, an evaporation salt making unit 300, a preheating heat exchanger 301, a vapor compressor 302, a crystallization separator 303, a thickener 304, an enamel kettle 305, a potassium salt centrifuge 306, a potassium mother liquid tank 307, a potassium mother liquid heat exchanger 308, a sodium mother liquid tank 309, a sodium salt centrifuge 310, a forced circulation evaporator 311, a gas-liquid separator 312, a falling film evaporator 313, a distilled water tank 314, a drying unit 400, a water washing fly ash conveyor 401, a water washing fly ash discharger 402, a water washing fly ash dryer 403, a drying fly ash collector 404, a drying elevator 405, a high-temperature melting disposal unit 500, a fly ash, A furnace entering fly ash metering device 501, a melting furnace 502 and a heat exchange device 503.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.

According to the utility model discloses an embodiment, the utility model discloses can adopt waste incineration flying dust, kiln ash or the secondary flying dust that high temperature handled the production as the raw materials, carry out washing desalination and high temperature melting and handle.

In one aspect of the present invention, the present invention provides a system for treating fly ash by washing and desalting with high temperature fusion. According to the utility model discloses an embodiment, this system includes: an eluent outlet of the fly ash eluting unit is connected with an inlet of the eluent purifying unit, an outlet of the eluent purifying unit is connected with an inlet of the evaporation salt-making unit, an eluting ash outlet of the fly ash eluting unit is connected with the drying unit, and an outlet of the drying unit is connected with the high-temperature melting disposal unit; the fly ash elution unit comprises a mixer, a water washing reactor and an elution ash/liquid separator, wherein the inlet of the mixer is respectively connected with the outlet of a fly ash metering device and the outlet of a water distribution metering device, the outlet of the mixer is connected with the water washing reactor, the outlet of the water washing reactor is connected with the inlet of an elution ash/liquid separator, the elution ash outlet of the elution ash/liquid separator is connected with the drying unit, and the eluent outlet of the elution ash/liquid separator is connected with the eluent purification unit; the eluent purification unit comprises a heavy metal removal reactor, a hardness removal reactor, a concentration and precipitation device, a precipitate removal device, a multistage filtering device and a Ph adjusting device, wherein an inlet of the heavy metal removal reactor is connected with an eluent outlet of the elution ash/liquid separator, an outlet of the heavy metal removal reactor is connected with the hardness removal reactor, an outlet of the hardness removal reactor is connected with an inlet of the precipitate removal device, a precipitate outlet of the precipitate removal device is connected with the water washing reactor, an eluent outlet of the precipitate removal device is connected with an inlet of the concentration and precipitation device, an underflow outlet of the concentration and precipitation device is connected with the hardness removal reactor, an overflow outlet of the concentration and precipitation device is connected with an inlet of the multistage filtering device, an outlet of the multistage filtering device is connected with an inlet of the Ph adjusting device, the outlet of the Ph adjusting device is connected with the inlet of the evaporation salt making unit; the evaporation salt-making unit comprises a preheating heat exchanger, a steam compressor, a crystallization separator, a thickener, an enamel kettle, a sylvite centrifuge, a sylvite mother liquor tank, a sylvite mother liquor heat exchanger, a sodium mother liquor tank, a sodium salt centrifuge, a forced circulation evaporator, a gas-liquid separator, a falling-film evaporator and a distilled water tank, wherein the outlet of an evaporation water supply tank is connected with the preheating heat exchanger, the outlet of the preheating heat exchanger is connected with the falling-film evaporator, the outlet of the falling-film evaporator is respectively connected with the gas-liquid separator and the forced circulation evaporator, the outlet of the gas-liquid separator is connected with the steam compressor, the outlet of the steam compressor is respectively connected with the falling-film evaporator and the forced circulation evaporator, the outlet of the forced circulation evaporator is connected with the outlet of the crystallization separator, and the outlet of the crystallization separator is respectively, The thickener is connected with the sodium salt centrifugal machine and the enamel kettle respectively, the outlet of the sodium salt centrifugal machine is connected with the sodium mother liquor tank, the outlet of the enamel kettle is connected with the potassium salt centrifugal machine, the potassium salt centrifugal machine is connected with the potassium mother liquor tank, the potassium salt mother liquor tank is connected with the potassium mother liquor heat exchanger, and the forced circulation heat exchanger is connected with the sodium mother liquor tank and the potassium mother liquor heat exchanger respectively; the drying unit comprises a washing fly ash conveyor, a washing fly ash feeder, a washing fly ash dryer and a drying fly ash collector, wherein the outlet of the washing fly ash conveyor is connected with the inlet of the washing fly ash feeder, the outlet of the washing fly ash feeder is connected with the inlet of the washing fly ash dryer, the outlet of the washing fly ash dryer is connected with the inlet of the drying fly ash collector, and the outlet of the drying fly ash collector is connected with the high-temperature melting disposal unit. The high-temperature melting disposal unit comprises a dry fly ash hoist, a furnace-entering fly ash metering device, a melting furnace, a heat exchange device and a flue gas purification device, wherein an outlet of the dry fly ash hoist is connected with the furnace-entering fly ash metering device, an outlet of the furnace-entering fly ash metering device is connected with the melting furnace, a high-temperature flue gas outlet and a high-temperature fluid outlet of the high-temperature melting furnace are respectively connected with the heat exchange device, and a gas outlet of the heat exchange device is connected with the flue gas purification device. Utility model people discover, through with washing dechlorination technique and high temperature melting technique looks coupling, adopt special multistage countercurrent rinsing technique, dechlorination effect is good, and water consumption is low, no raise dust. The method of alkaline elution and heavy metal multiple capture is adopted, so that the heavy metal and dioxin in the fly ash are transferred less; the MVR evaporation salt making technology is adopted, salt is produced as a byproduct, condensed water is recycled, energy consumption is low, and pollution is avoided; the fly ash is dried by adopting the fused product and the waste heat of high-temperature flue gas, so that energy is saved and emission is reduced; the high-temperature melting fly ash is adopted, heavy metals and dioxin are thoroughly treated, the method is safe and environment-friendly, no after-troubles exist, and the reduction, the recycling and the harmlessness of the waste incineration fly ash treatment are completely realized.

The system and reverse detailed description of the present invention combining fly ash washing and desalting with high temperature melting treatment will be described with reference to fig. 1-3. According to the utility model discloses an embodiment this system includes: a fly ash elution unit 100, an eluent purification unit 200, an evaporation salt making unit 300, a drying unit 400 and a high temperature melting disposal unit 500.

According to the utility model discloses an embodiment, fly ash elution unit 100 includes blender 101, washing reactor 102, elution ash/liquid separator 103, elution liquid jar 104, blender 101 fly ash import respectively with fly ash metering device export, the export of water distribution metering device links to each other, blender 101's export links to each other with washing reactor 102, washing reactor 102's export links to each other with elution ash/liquid separator 103 import, elution ash/liquid separator 103's elution ash export links to each other with drying unit 400, elution ash/liquid separator 103 eluant export links to each other with elution liquid jar 104.

According to the utility model discloses an embodiment can be according to raw materials and washing flying dust chlorine content requirement, and the elution process adopts one-level to N level washing, and every level washing process washing thick liquid is not limited to only adopting once to elute ash/liquid separation yet, can adopt 1 to N times of separation processes to the flying dust thick liquid according to raw materials and washing flying dust chlorine content requirement. The utility model has another advantage that the fly ash elution process adopts multi-stage countercurrent rinsing, which significantly reduces the water consumption of the fly ash elution process. The utility model discloses during the meaning of well countercurrent rinsing is elution when adopting one-level, second grade, … … N level, the washing liquid of second grade regard as the washing flying dust slurrying water distribution of first grade, and the washing liquid of third grade regards as the washing flying dust slurrying water distribution of second grade, … …, and the washing liquid of Nth grade regards as the washing flying dust slurrying water distribution of N-1 level. It is noted that the skilled person can select the multi-stage rinsing and/or the multiple separation devices to be used according to the actual needs.

According to the utility model discloses an embodiment, fly ash elution process adopts multistage countercurrent rinsing, greatly reduced elution process water consumption, dechlorination effect reaches more than 90%, solves fly ash elution process water consumption height, the high problem of washing fly ash chloride ion content. The utility model discloses the people discover, and the washing reactor and the elution ash/liquid separator of flying ash elution process do not have special requirement, only need to satisfy and obtain the washing flying ash that the moisture content is less than 40% and contain the washing liquid that the solid rate is less than 1% after the flying ash elutes. According to the utility model discloses an embodiment, utility model people discover, the present preferred plate and frame filter press and centrifugal separator of elution ash/liquid separator.

According to the embodiment of the present invention, the eluent purification unit 200 comprises a heavy metal removal tank 201, a hardness removal reactor 202, a precipitate removal device 203, a concentration precipitation device 204, a multi-stage filtration device 205, and a Ph adjustment device 206, wherein the inlet of the heavy metal removal reactor 201 is connected to the eluent outlet of the elution ash/liquid separator 103, the outlet of the heavy metal removal reactor 201 is connected to the hardness removal reactor 202, the outlet of the hardness removal reactor 202 is connected to the inlet of the precipitate removal device 203, the precipitate outlet of the precipitate removal device 203 is connected to the water washing reactor 102, the eluent outlet of the precipitate removal device 203 is connected to the inlet of the concentration precipitation device 204, the underflow outlet of the concentration precipitation device 204 is connected to the hardness removal reactor 202, the overflow outlet of the concentration precipitation device 204 is connected to the inlet of the multi-stage filtration device 205, the outlet of the multistage filtering device 205 is connected to the inlet of the Ph adjusting device 206, and the outlet of the Ph adjusting device 206 is connected to the inlet of the evaporative water supply tank.

According to the embodiment of the utility model, the heavy metal removal process of the eluent can adopt multi-stage removal according to the characteristics of the eluent and the requirement of the purified water quality, so as to be beneficial to effectively removing the heavy metal in the eluent; the filtration process of the eluent adopts multi-stage filtration, which is beneficial to effectively removing solid suspended matters in the eluent. According to the utility model discloses an embodiment, through adopting multistage heavy metal desorption, removing hardness and filtering solid suspended solid for washing liquid is after physicochemical purification treatment, impurity such as suspended solid, calcium magnesium ion, heavy metal in the desorption washing liquid, in order to satisfy the requirement of evaporation salt manufacturing technology and crystallization salt quality.

According to the embodiment of the present invention, the evaporation salt production unit 300 includes a preheating heat exchanger 301, a vapor compressor 302, a crystallization separator 303, a thickener 304, an enamel kettle 305, a potassium salt centrifuge 306, a potassium mother liquor tank 307, a potassium mother liquor heat exchanger 308, a sodium mother liquor tank 309, a sodium salt centrifuge 310, a forced circulation evaporator 311, a vapor-liquid separator 312, a falling-film evaporator 313, and a distilled water tank 314, wherein an outlet of the evaporation water supply tank is connected with the preheating heat exchanger 301, an outlet of the preheating heat exchanger 301 is connected with the falling-film evaporator 313, an outlet of the falling-film evaporator 313 is respectively connected with the vapor-liquid separator 312 and the forced circulation evaporator 311, an outlet of the vapor-liquid separator 312 is connected with the vapor compressor 302, an outlet of the vapor compressor 302 is respectively connected with the falling-film evaporator 312 and the forced circulation evaporator 311, an outlet of the forced circulation evaporator 311 is connected with an outlet of the crystallization separator 303, the thickener 304 is connected, the thickener 304 is respectively connected with a sodium salt centrifuge 310 and an enamel kettle 305, the outlet of the sodium salt centrifuge 310 is connected with a sodium mother liquor tank 309, the outlet of the enamel kettle 305 is connected with a potassium salt centrifuge 306, the potassium salt centrifuge 306 is connected with a potassium mother liquor tank 307, the potassium salt mother liquor tank 307 is connected with a potassium mother liquor heat exchanger 308, and the forced circulation heat exchanger 311 is respectively connected with the sodium mother liquor tank 309 and the potassium mother liquor heat exchanger 308.

According to the utility model discloses an embodiment, every can be according to engineering characteristics and the requirement of crystallization salt quality, decides whether to set up and divide the salt, if do not divide the salt, enamel kettle 305, potassium salt centrifuge 306, potassium mother liquor jar 307, potassium mother liquor heat exchanger 308 and sodium mother liquor jar 309 can not set up. In order to reduce energy consumption, evaporation condensate water heat exchange, non-condensation heat exchange and the like are generally adopted in the preheating heat exchange process, and heat energy in the evaporation process is fully utilized. And separating soluble salt and water in the water washing liquid by evaporation to obtain crystalline salt with the total amount of sodium chloride and potassium chloride not less than 90%, and recycling the evaporated condensate water.

According to the embodiment of the utility model, dry unit 400 includes washing flying ash conveyer 401, washing flying ash unloading ware 402, washing flying ash desiccator 403, dry flying ash collector 404 and dry flying ash lifting machine 405, washing flying ash conveyer 401's export links to each other with washing flying ash unloading ware 402's import, washing flying ash unloading ware 402's export links to each other with washing flying ash desiccator 403's import, washing flying ash desiccator 403's export dry flying ash collector 404 import links to each other, dry flying ash collector 404 export links to each other with dry flying ash lifting machine 405.

According to the utility model discloses an embodiment, flying dust drying process does not have the special requirement to drying equipment, dust collecting equipment, only needs to reach the moisture content that reduces washing flying dust through the drying, obtains the dry flying dust that chloride ion content is less than 1%, the moisture content is less than 5%. The utility model discloses a discovery, in order to reach the environmental protection requirement, the dry hot-blast entry temperature that needs to satisfy in the drying process is 120 cake with heat 300 ℃, preferably 180 cake with heat 280 ℃, and the deashing mode of dust collector adopts pulse row jetting, and the dust collector satisfies that dirt export concentration does not exceed 10mg/m and thin year. In addition utility model people still discovers, need to adopt mixed drying measure in order to avoid dry and transportation process's flying dust to block up, agglomerate, the wall built-up, adopts the special conveying equipment of flying dust that has functions such as scattering, mixing, and effect is carried to the guarantee flying dust, reduces equipment and pipe blockage.

According to the utility model discloses an embodiment, high temperature melting handles unit 500 and including going into stove flying dust metering device 501, melting furnace 502, heat transfer device 503, goes into stove flying dust metering device 501 and links to each other with dry flying dust lifting machine 405's export, goes into stove flying dust metering device 501's export and links to each other with melting furnace 502, and melting furnace 502's export links to each other with heat transfer device 503. The utility model discloses the people discovers that the melting furnace does not have the special requirement to the moisture of income kiln flying dust, if not dry, adopts the flying dust to spout and also can satisfy the technological requirement in going into the kiln, and the flying dust only contains the energy consumption that the water height can increase the melting furnace, carries out drying process before going into the kiln through adopting the flying dust, reduces energy consumption and the carbon emission that melting furnace system ton flying dust was dealt with.

The high-temperature environment of the melting furnace can thoroughly decompose organic pollutants such as dioxin and the like in the fly ash, and the burning rate of harmful components can reach more than 99.99 percent; the final product of the melting furnace is a vitreous solid material, which can effectively prevent heavy metals in the fly ash from dissolving out and avoid secondary pollution to the environment.

According to the scheme, the system and the method for treating the fly ash by washing and desalting in combination with high-temperature melting completely realize reduction, recycling and harmlessness of fly ash treatment.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations can be made in the above embodiments by those skilled in the art without departing from the scope of the present invention, and that various changes in the detailed description and applications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims (6)

1. The system for treating fly ash by water washing and desalting combined high-temperature melting is characterized in that an eluent outlet of a fly ash eluting unit is connected with an inlet of an eluent purifying unit, an outlet of the eluent purifying unit is connected with an inlet of an evaporation salt making unit, an eluting ash outlet of the fly ash eluting unit is connected with a drying unit, and an outlet of the drying unit is connected with a high-temperature melting treatment unit.

2. The system according to claim 1, wherein the fly ash elution unit comprises a mixer, a water washing reactor and an elution ash/liquid separator, wherein an inlet of the mixer is respectively connected with an outlet of the fly ash metering device and an outlet of the water distribution metering device, an outlet of the mixer is connected with the water washing reactor, an outlet of the water washing reactor is connected with an inlet of the elution ash/liquid separator, an elution ash outlet of the elution ash/liquid separator is connected with the drying unit, and an elution outlet of the elution ash/liquid separator is connected with the elution liquid purification unit.

3. The system of claim 2, wherein the eluent purification unit comprises a heavy metal removal reactor, a hardness removal reactor, a concentration and precipitation device, a precipitate removal device, a multi-stage filtration device and a pH adjusting device, wherein an inlet of the heavy metal removal reactor is connected with an eluent outlet of the elution ash/liquid separator, an outlet of the heavy metal removal reactor is connected with the hardness removal reactor, an outlet of the hardness removal reactor is connected with an inlet of the precipitate removal device, a precipitate outlet of the precipitate removal device is connected with the water washing reactor, an eluent outlet of the precipitate removal device is connected with an inlet of the concentration and precipitation device, an underflow outlet of the concentration and precipitation device is connected with the hardness removal reactor, an overflow outlet of the concentration and precipitation device is connected with an inlet of the multi-stage filtration device, the outlet of the multistage filtering device is connected with the inlet of the pH adjusting device, and the outlet of the pH adjusting device is connected with the inlet of the evaporation salt making unit.

4. The system according to claim 1, wherein the evaporation salt production unit comprises a preheating heat exchanger, a steam compressor, a crystallization separator, a thickener, an enamel kettle, a potassium salt centrifuge, a potassium mother liquor tank, a potassium mother liquor heat exchanger, a sodium mother liquor tank, a sodium salt centrifuge, a forced circulation evaporator, a gas-liquid separator, a falling-film evaporator and a distilled water tank, an outlet of the evaporation water supply tank is connected with the preheating heat exchanger, an outlet of the preheating heat exchanger is connected with the falling-film evaporator, outlets of the falling-film evaporator are respectively connected with the gas-liquid separator and the forced circulation evaporator, an outlet of the gas-liquid separator is connected with the steam compressor, outlets of the steam compressor are respectively connected with the falling-film evaporator and the forced circulation evaporator, and an outlet of the forced circulation evaporator is connected with an outlet of the crystallization separator, the outlet of the crystallization separator is respectively connected with the steam compressor and the thickener, the thickener is respectively connected with the sodium salt centrifugal machine and the enamel kettle, the outlet of the sodium salt centrifugal machine is connected with the sodium mother liquor tank, the outlet of the enamel kettle is connected with the potassium salt centrifugal machine, the potassium salt centrifugal machine is connected with the potassium mother liquor tank, the potassium mother liquor tank is connected with the potassium mother liquor heat exchanger, and the forced circulation heat exchanger is respectively connected with the sodium mother liquor tank and the potassium mother liquor heat exchanger.

5. The system according to claim 1, wherein the drying unit comprises a water-washing fly ash conveyor, a water-washing fly ash discharger, a water-washing fly ash dryer and a drying fly ash collector, an outlet of the water-washing fly ash conveyor is connected with an inlet of the water-washing fly ash discharger, an outlet of the water-washing fly ash discharger is connected with an inlet of the water-washing fly ash dryer, an outlet of the water-washing fly ash dryer is connected with an inlet of the drying fly ash collector, and an outlet of the drying fly ash collector is connected with the high-temperature melting disposal unit.

6. The system of claim 1, wherein the high-temperature melting disposal unit comprises a dry fly ash hoist, a furnace-entering fly ash metering device, a melting furnace, a heat exchange device and a flue gas purification device, an outlet of the dry fly ash hoist is connected with the furnace-entering fly ash metering device, an outlet of the furnace-entering fly ash metering device is connected with the melting furnace, a high-temperature flue gas and a high-temperature fluid outlet of the melting furnace are respectively connected with the heat exchange device, and a gas outlet of the heat exchange device is connected with the flue gas purification device.

Images