CN114472474A - Industrial waste salt recycling treatment system and method - Google Patents
Industrial waste salt recycling treatment system and method Download PDFInfo
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- CN114472474A CN114472474A CN202210011538.7A CN202210011538A CN114472474A CN 114472474 A CN114472474 A CN 114472474A CN 202210011538 A CN202210011538 A CN 202210011538A CN 114472474 A CN114472474 A CN 114472474A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a system and a method for recycling treatment of industrial waste salt, which comprises a pretreatment module, a drying module, a microwave thermal desorption module and a refining module which are sequentially connected; the microwave thermal analysis module comprises a microwave thermal analysis module, a microwave thermal analysis reaction chamber, a microwave magnetron, a microwave thermal analysis module and a microwave thermal analysis module, wherein the heat insulation shell of the microwave thermal analysis module encloses the microwave thermal analysis reaction chamber, and the outer wall of the heat insulation shell is connected with the microwave magnetron through a waveguide; and the material conveyor is arranged inside the heat-insulating shell and used for providing a material receiving and conveying working surface. According to the method, microwave thermal analysis is taken as a core, and dissolution precipitation and inorganic substance adsorption precipitation are combined, so that the removal rate of organic matters in waste salt is high, the TOC in crystal salt is reduced to be below 5mg/L, and the industrial salt standard is met; realizes the harmless treatment and resource treatment of the waste salt, and changes waste into valuable.
Description
Technical Field
The invention belongs to the technical field of industrial waste salt treatment, and particularly relates to a system and a method for recycling industrial waste salt.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The industrial waste salt (hereinafter referred to as waste salt) is mainly generated in industrial production processes of pesticide intermediates, drug synthesis, printing and dyeing and the like, and processes of solid-liquid separation, solution concentration crystallization, sewage treatment and the like, and has the characteristics of various types, complex components, numerous sources, high treatment cost, great environmental hazard and the like. With the rapid development of chemical industry and related industries in China, industrial waste salt is gradually increased year by year, the annual output is over 2000 ten thousand tons, and the stacking and effective disposal of the waste salt become important problems to be solved urgently in the industries.
Because the components are complex, the disposal technology is difficult to systematize, and the disposal of industrial waste salt mainly comprises landfill, incineration and high-temperature melting disposal methods at present. The waste salt landfill must enter a rigid landfill plant, the occupied area is large, the landfill cost is high, and enterprises cannot bear the waste salt landfill cost. Incineration is generally poor in disposal effect due to low calorific value and mainly inorganic compounds, and the risk of corrosion of an incinerator hearth and generation of dioxin are important reasons for restricting large-scale application of the incineration. Although the high-temperature melting treatment can completely remove the organic matters in the waste salt at 800-1200 ℃, the problems of equipment ring formation, pipeline caking and the like are easily caused, and the flue gas entrainment can cause the increase of the investment cost of secondary purification and is not beneficial to the long-period standard emission.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a method for recycling and disposing industrial waste salt.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a resource treatment system for industrial waste salt, which comprises a pretreatment module, a drying module, a microwave thermal desorption module and a refining module which are connected in sequence;
the microwave thermal analysis module comprises a microwave thermal analysis module, a microwave thermal analysis reaction chamber, a microwave magnetron, a microwave thermal analysis module and a microwave thermal analysis module, wherein the heat insulation shell of the microwave thermal analysis module encloses the microwave thermal analysis reaction chamber, and the outer wall of the heat insulation shell is connected with the microwave magnetron through a waveguide;
and the material conveyor is arranged inside the heat-insulating shell and used for providing a material receiving and conveying working surface.
In a second aspect, the invention provides a method for recycling industrial waste salt, which comprises the following steps:
pretreating and screening industrial waste salt to remove large impurities in the industrial waste salt, and crushing and screening the agglomerated waste salt;
drying the pretreated waste salt;
carrying out microwave thermal desorption on the dried waste salt to remove organic matters in the waste salt, and discharging thermal desorption waste gas after waste gas treatment;
and carrying out microwave thermal resolution on the obtained waste salt, and carrying out dissolution, solid-liquid separation, impurity removal by adsorption and evaporative crystallization to obtain the industrial finished salt.
The beneficial effects achieved by one or more of the embodiments of the invention described above are as follows:
according to the method, microwave thermal analysis is taken as a core, and dissolution precipitation and inorganic substance adsorption precipitation are combined, so that the removal rate of organic matters in waste salt is high, the TOC in crystal salt is reduced to be below 5mg/L, and the industrial salt standard is met; realizes the harmless treatment and resource treatment of the waste salt, and changes waste into valuable.
The organic matters in the industrial waste salt are thermally analyzed in a microwave heating mode, the pyrolysis temperature is low, the equipment is not looped, the pipeline is not caked, and the starting speed of the microwave device is high, so that the microwave device can be started and used immediately. In addition, the microwave heating also has the advantages of high heating efficiency, and energy conservation and environmental protection compared with the traditional burning method or high-temperature melting method.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the overall architecture of an industrial waste salt resource disposal system according to one or more embodiments of the present invention;
FIG. 2 is a schematic diagram of a pre-processing module according to one or more embodiments of the invention;
FIG. 3 is a schematic diagram of a drying module configuration according to one or more embodiments of the present disclosure;
FIG. 4 is a schematic diagram of a microwave thermal desorption apparatus according to one or more embodiments of the present invention;
FIG. 5 is a schematic diagram of a structure of an exhaust treatment module according to one or more embodiments of the present disclosure;
FIG. 6 is a schematic diagram of a refining module configuration according to one or more embodiments of the invention.
In the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1-a waste salt pond, 2-a first conveyor, 3-a sieving machine, 4-a second conveyor, 5-a crusher, 6-a drying device feed hopper, 7-a drying material conveyor, 8-a drying feed driving motor, 9-a rotary dryer, 10-a transmission gear, 11-a roller rotating driving motor, 12-a drying device discharge port, 13-a drying device air inlet, 14-a drying device air outlet, 15-a pyrolysis device solid feed inlet, 16-a material baffle, 17-a first driving motor, 18-a supporting leg, 19-a first material conveyor, 20-an air inlet, 21-a temperature sensor, 22-a vibration stirrer, 23-a vibration stirring driving motor and 24-a vibration stirrer connecting rod, 25-stirring paddle, 26-microwave magnetron, 27-microwave waveguide, 28-first microwave pyrolysis reaction chamber, 29-heat preservation shell, 30-communicating pipe, 31-second driving motor, 32-second material conveyor, 33-pyrolysis device solid discharge port, 34-second microwave pyrolysis reaction chamber, 35-thermal desorption waste gas outlet, 36-cyclone dust collector, 37-cyclone dust collector material cylinder, 38-desulfurizing tower, 39-desulfurizing tower air inlet, 40-desulfurizing tower air outlet, 41-activated carbon adsorption box, 42-tail gas fan, 43-chimney, 44-salt dissolving sedimentation tank, 45-first filter press, 46-saline solution pump, 47-adsorption sedimentation tank, 48-second filter press, 49-liquid filter tank, 50-a filtrate pump, 51-a preheater, 52-a gas-liquid separator, 53-a raw material liquid inlet of the gas-liquid separator, 54-a secondary steam outlet of the gas-liquid separator, 55-a circulating liquid inlet of the gas-liquid separator, 56-a concentrated liquid outlet of the gas-liquid separator, 57-a circulating liquid outlet of the gas-liquid separator, 58-a steam compressor, 59-an evaporator, 60-a forced circulation pump, 61-a thickener, 62-a centrifuge, 63-a mother liquid tank, 64-a dryer and 65-a finished product bin.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In order to solve the problems of high cost, large occupied area, poor treatment effect, equipment ring formation, pipeline agglomeration, high secondary purification investment cost and the like in waste salt treatment in the prior art, the invention provides a resource treatment system for industrial waste salt, which comprises a pretreatment module, a drying module, a microwave thermal desorption module and a refining module which are sequentially connected;
the microwave thermal analysis module comprises a microwave thermal analysis module, a microwave thermal analysis reaction chamber, a microwave magnetron, a microwave thermal analysis module and a microwave thermal analysis module, wherein the heat insulation shell of the microwave thermal analysis module encloses the microwave thermal analysis reaction chamber, and the outer wall of the heat insulation shell is connected with the microwave magnetron through a waveguide;
and the material conveyor is arranged inside the heat-insulating shell and used for providing a material receiving and conveying working surface.
In some embodiments, a vibration stirrer is further disposed in the microwave thermal analysis module, and a stirring blade of the vibration stirrer is disposed close to the working surface of the material conveyor and parallel to the running direction of the material conveyor.
Furthermore, the vibration stirrer comprises a driving motor, a connecting rod assembly and a stirring blade assembly, wherein the connecting rod assembly comprises a main connecting rod and a plurality of branch connecting rods, one end of the main connecting rod is connected with one end of each branch connecting rod, and the other end of the main connecting rod is connected with the driving motor;
the other end of each branch connecting rod is provided with a stirring blade which is distributed at different positions of the working surface of the material conveyor.
Because the agitator is the vibration agitator, its stirring range is limited, so set up a plurality of stirring paddle leaf, be convenient for carry out the intensive mixing with waste salt.
In some embodiments, the top of the thermal insulation shell is provided with a solid feed inlet, an air inlet and a thermal desorption waste gas outlet, wherein the solid feed inlet and the air inlet are positioned on the same side of the thermal insulation shell, and the thermal desorption waste gas outlet is positioned on the opposite side.
Contain inside organic matter waste salt and the air lets in the heat preservation casing with one side of heat preservation casing, carries out the pyrolysis under microwave heating's effect, and oxygen concentration is higher in the air under this kind of condition, improves the treatment effect to containing organic matter waste salt more easily.
Thermal desorption waste gas outlet is located the opposite side, and under the pressure of the air that lets in, the waste gas that the pyrolysis produced flows to the opposite side more easily, and then flows from thermal desorption waste gas outlet, can effectively reduce the dilution of thermal desorption waste gas to the oxygen in the pyrolysis environment, and then guarantee the treatment effect to containing organic matter waste salt better.
Further, the solid material outlet is arranged at the bottom of the heat preservation shell and is positioned on the same side with the thermal desorption waste gas outlet.
In some embodiments, the inside of the heat-insulating shell is provided with a low-temperature thermal desorption area, a medium-temperature thermal desorption area and a high-temperature thermal desorption area from the material inlet end to the material outlet end in sequence.
Furthermore, microwave magnetrons are arranged in the low-temperature thermal analysis area, the medium-temperature thermal analysis area and the high-temperature thermal analysis area, and the microwave efficiency is sequentially increased.
The temperature in the low-temperature thermal analysis area is low, the organic matters which are easy to thermally analyze and are in the waste salt can be analyzed, the organic matters which are difficult to thermally analyze at low temperature can be analyzed in the medium-temperature thermal analysis area, and the organic matters which are difficult to analyze can be analyzed in the high-temperature thermal analysis area. By adopting microwave multi-stage pyrolysis, the treatment efficiency of waste salt can be ensured, and the energy consumption can be effectively reduced.
Furthermore, temperature sensors are arranged in the low-temperature thermal desorption area, the medium-temperature thermal desorption area and the high-temperature thermal desorption area.
The temperature of each thermal analysis area is convenient to detect, and the temperature of each thermal analysis area is convenient to monitor, so that the thermal analysis efficiency is ensured.
In some embodiments, the material conveyor is a slat conveyor or a belt conveyor.
Furthermore, a driving roll shaft and a driven roll shaft of the material conveyor are respectively positioned at two ends inside the heat-insulating shell.
Furthermore, a material baffle is arranged between the feeding end of the material conveyor and the heat-insulating shell.
So as to prevent waste salt from falling between the material conveyor and the heat-insulating shell in the blanking process.
Furthermore, baffles are arranged between two sides of the material conveyor and the heat insulation shell in a butting way or between two sides of the material conveyor and the heat insulation shell.
To prevent waste salt from slipping off the material conveyor.
In some embodiments, the pretreatment module comprises a waste salt pond, a first conveyor, a screening machine, a second conveyor, and a crusher connected in series.
In some embodiments, the dryer in the drying module is a rotary dryer.
Further, a drying device feed hopper of the drying module is located below the crusher.
Furthermore, the tail end of the rotary dryer is provided with a drying device air inlet, and the front end of the rotary dryer is provided with a drying device air outlet.
Hot air is introduced into the rotary dryer, and the crushed waste salt can be fully heated and dried.
Furthermore, a discharge port of the drying device is arranged at the tail end of the rotary dryer.
In some embodiments, the polishing module comprises a purification system and a concentration system, an outlet of the purification system being connected to an inlet of the concentration system.
Furthermore, the purification system comprises a salt dissolving sedimentation tank, a first pressure filter and a filtrate tank which are connected in sequence, the adsorption sedimentation tank is connected with the salt dissolving sedimentation tank, and the adsorption sedimentation tank is connected with the filtrate tank through a second pressure filter.
Furthermore, the filtrate tank is connected with the adsorption sedimentation tank through a filtrate pump.
Still further, the adsorption and precipitation tank is connected with a concentration system through a pipeline.
Further, the concentration system comprises a preheater, a gas-liquid separator and a thickener which are connected in sequence, and the preheater is connected with the purification system.
The purified salt solution is preheated, subjected to gas-liquid separation and concentration, and crystallized by a thickener to obtain finished salt particles.
Furthermore, the thickener also comprises a centrifuge, and the centrifuge is connected with the thickener. And separating the crystallized solid-liquid mixture by using a centrifugal machine to obtain salt crystals with higher humidity.
Still further, still include the drying-machine, drying-machine is connected with centrifuge.
And drying the salt crystals obtained by separation by using a dryer to obtain industrial finished salt.
Still further, the system also comprises a mother liquor tank and an evaporator, wherein a heat medium channel of the evaporator is communicated with the top of the gas-liquid separator; one end of a cold medium channel of the evaporator is connected with the mother liquor tank, and the other end of the cold medium channel of the evaporator is connected with the gas-liquid separator.
The temperature of the gas flowing out of the top of the gas-liquid separator is high, the gas with high temperature is adopted to heat and evaporate the saturated salt solution obtained by centrifugal separation, the heated saturated salt solution is conveyed back to the gas-liquid separator again to carry out gas-liquid separation, and then the saturated salt solution is concentrated. And (4) crystallizing the concentrated salt solution in a thickener, and performing centrifugal separation and drying to obtain the industrial finished salt.
Furthermore, a steam compressor is connected between the gas-liquid separator and the evaporator.
Further, the heat medium outlet of the evaporator is connected to the preheater. The cooled steam flowing out of the evaporator still has higher temperature, and can preheat the purified salt solution.
In some embodiments, the system further comprises an exhaust gas treatment module, wherein the exhaust gas treatment module comprises a cyclone dust collector, a desulfurizing tower, an activated carbon adsorption box and a chimney which are connected in sequence.
In a second aspect, the invention provides a method for recycling industrial waste salt, which comprises the following steps:
pretreating and screening industrial waste salt to remove large impurities in the industrial waste salt, and crushing and screening the agglomerated waste salt;
drying the pretreated waste salt;
carrying out microwave thermal desorption on the dried waste salt to remove organic matters in the waste salt, and discharging thermal desorption waste gas after waste gas treatment;
and carrying out microwave thermal resolution on the obtained waste salt, and carrying out dissolution, solid-liquid separation, impurity removal by adsorption and evaporative crystallization to obtain the industrial finished salt.
In some embodiments, the particle size of the agglomerated waste salt after crushing is less than 30 mm.
In some embodiments, the dried waste salt is subjected to fractional microwave thermal desorption, followed by low temperature thermal desorption, medium temperature thermal desorption, and high temperature thermal desorption.
Further, the temperature of low-temperature thermal desorption is 150-300 ℃, the temperature of medium-temperature thermal desorption is 300-450 ℃, and the temperature of high-temperature thermal desorption is 450-550 ℃.
Furthermore, the relative pressure in the microwave pyrolysis reaction chamber is-40 to-5 kPa.
In some embodiments, the specific steps of waste salt purification are: dissolving the waste salt with the organic matters removed, standing for layering, extracting supernatant, and adding an adsorbent;
collecting filtrate after filter pressing of the lower-layer precipitate, and discharging filter cakes;
and (3) standing and layering the supernatant added with the adsorbent, discharging the lower-layer precipitate after filter pressing, and performing concentration after the filtrate reaches the standard.
Further, the method also comprises the step of adding an adsorbent into the collected filtrate for purification.
The waste heat recovery of the thermal desorption waste gas is realized through the rotary dryer, the enthalpy of secondary steam is improved through the steam compressor, the steam requirement of steam in the system is met, the integral energy utilization rate of the system is improved, and the rotary dryer has the outstanding beneficial effects of energy conservation and consumption reduction;
the functions of all modules in the system are obvious, the overall performance of the system is high, the adaptability is strong, and the system has wide application scenes;
the reproducibility is strong, the reference significance is very high to the industry of industrial waste salt disposal, and the large-scale popularization can be carried out.
The device is high in integration level and small in occupied area, skid-mounted combination and portable movement can be achieved, and the scene requirement of distributed disposal is met.
The invention is further described with reference to the following figures and specific examples.
Examples
Fig. 1 is a schematic structural diagram of a recycling system for industrial waste salt according to an exemplary embodiment of the present invention; FIG. 2 is a schematic diagram of the pre-processing module shown in FIG. 1; FIG. 3 is a schematic view of the drying module of FIG. 1; FIG. 4 is a schematic structural diagram of the microwave thermal desorption apparatus shown in FIG. 1;
FIG. 5 is a schematic structural diagram of the tail gas treatment module shown in FIG. 1; fig. 6 is a schematic structural diagram of the refining module in fig. 1.
As shown in fig. 1, the industrial waste salt recycling treatment system includes a pretreatment module, a drying module, a microwave thermal analysis module, a refining module, and a tail gas treatment module.
As shown in fig. 2, the pretreatment module includes a waste salt pond 1, a first conveyor 2, a screening machine 3, a second conveyor 4 and a crusher 5, the first conveyor 2 conveys the waste salt in the waste salt pond 1 to the screening machine 3 for screening, large impurities such as wood blocks and bricks in the waste salt are screened out, the screened waste salt is conveyed to the crusher 5 through the second conveyor 4 for crushing, the waste salt material is crushed to be less than 30mm, and the crushed waste salt enters the drying module.
As shown in fig. 3, the drying module includes a drying device feeding hopper 6, a dried material conveyor 7, a dried material feeding driving motor 8, a rotary dryer 9, a transmission gear 10, a drum rotation driving motor 11, a drying device discharging port 12, a drying device air inlet 13, and a drying device air outlet 14. The pretreated materials enter a feed hopper 6 of a drying device and are conveyed to a rotary dryer 9 by a dried material conveyor 7 for drying, and the dried materials are discharged from a discharge port 12 of the drying device and enter a microwave thermal desorption module. Meanwhile, the thermal desorption waste gas generated by the thermal desorption module enters the drying device to heat the waste salt material, most of moisture in the waste salt is removed, and the thermal desorption waste gas after heat exchange is discharged from the gas outlet 14 of the drying device and enters the tail gas treatment module.
As shown in fig. 4, a microwave thermal analysis module, that is, a microwave thermal analysis device for industrial waste salt, includes a microwave pyrolysis reaction chamber, a microwave magnetron 26, a microwave waveguide 27, a first material conveyor 19, a second material conveyor 32, a vibration stirrer 22, support legs 18, a material baffle 16, and a communicating tube 30, the microwave pyrolysis reaction chamber includes a first microwave pyrolysis reaction chamber 28 and a second microwave pyrolysis reaction chamber 34, the first microwave pyrolysis reaction chamber 28 and the second microwave pyrolysis reaction chamber 34 are connected through the communicating tube 30, the microwave magnetron 26 is disposed on the top wall surfaces of the first microwave pyrolysis reaction chamber 28 and the second microwave pyrolysis reaction chamber 34 through the microwave waveguide 27, the first material conveyor 19 and the second material conveyor 32 are respectively and fixedly disposed at the bottoms of the first microwave pyrolysis reaction chamber 28 and the second microwave pyrolysis reaction chamber 34 through the support legs 18, the vibrating stirrer 22 is arranged between the material conveyer and the top wall surface of the microwave pyrolysis reaction chamber, and the material baffle 16 is arranged between the material conveyer and the top wall surface of the microwave pyrolysis reaction chamber.
Specifically, the microwave pyrolysis reaction chamber is wholly rectangular, and the microwave pyrolysis reaction chamber includes pyrolysis device solid feed inlet 15, pyrolysis device solid discharge gate 33, air inlet 20, thermal desorption waste gas outlet 35, temperature sensor 21. The microwave pyrolysis reaction chamber comprises a low-temperature pyrolysis zone A1, a medium-temperature pyrolysis zone A2 and a high-temperature pyrolysis zone A3 which are arranged along a material moving direction, wherein the material moving direction is a direction in which a material moves from a pyrolysis device solid feeding hole 15 to a pyrolysis device solid discharging hole 33, the length of the low-temperature pyrolysis zone A1 along the material moving direction accounts for 10% -30% of the total length of the microwave pyrolysis reaction chamber, the length of the medium-temperature pyrolysis zone A2 along the material moving direction accounts for 20% -40% of the total length of the microwave pyrolysis reaction chamber, and the length of the high-temperature pyrolysis zone A3 along the material moving direction accounts for 20% -40% of the total length of the microwave pyrolysis reaction chamber; the pyrolysis device solid feeding hole 15 is formed in the top wall of the low-temperature pyrolysis region A1 so that waste salt materials can smoothly enter under the action of gravity, the air inlet 20 is formed in the top wall of the low-temperature pyrolysis region A1 and is adjacent to the pyrolysis device solid feeding hole 15, the pyrolysis device solid discharging hole 33 is formed in the bottom wall of the high-temperature pyrolysis region A3 so that the materials can be smoothly discharged under the action of gravity, and the pyrolysis analysis waste gas outlet 35 is formed in the top wall of the high-temperature pyrolysis region A3; the microwave magnetrons 26 are respectively arranged on the top wall surfaces of the low-temperature pyrolysis region A1, the medium-temperature pyrolysis region A2 and the high-temperature pyrolysis region A3 through microwave waveguides 27, and the number of the microwave magnetrons 26 arranged in the low-temperature pyrolysis region A1, the medium-temperature pyrolysis region A2 and the high-temperature pyrolysis region A3 is not less than 1; the temperature sensor 21 is arranged on the top wall surfaces of the low-temperature pyrolysis zone A1, the medium-temperature pyrolysis zone A2 and the high-temperature pyrolysis zone A3, and the number of the temperature sensor 21 arranged on the low-temperature pyrolysis zone A1, the medium-temperature pyrolysis zone A2 and the high-temperature pyrolysis zone A3 is not less than 1.
Specifically, the temperature of the low-temperature pyrolysis zone A1 is controlled to be 150-300 ℃, the temperature of the medium-temperature pyrolysis zone A2 is controlled to be 300-450 ℃, and the temperature of the high-temperature pyrolysis zone A3 is controlled to be 450-550 ℃.
Specifically, the relative pressure in the microwave pyrolysis reaction chamber is controlled in the range of-40 kPa to-5 kPa.
Specifically, the material baffle 16 is located at an initial position in the material moving direction and forms a certain angle with the material moving direction, so that the solid material cannot leak to the bottom of the material conveyor, and the solid material is conveyed in the material moving direction completely.
Specifically, the vibration agitator 22 includes vibration stirring driving motor 23, vibration agitator connecting rod 24, stirring paddle 25, vibration stirring driving motor 23 links to each other with vibration agitator connecting rod 24, vibration agitator connecting rod 24 drives stirring paddle 25 vibration stirring, makes the material be heated more evenly, and the pyrolysis is more abundant.
Specifically, the first material conveyor 19 and the second material conveyor 32 are both chain plate conveyors and are fixed at the bottom of the microwave pyrolysis reaction chamber through support legs 18, and a driving roller shaft and a driven roller shaft of the first material conveyor are respectively arranged at two ends of the microwave pyrolysis reaction chamber.
Specifically, the microwave pyrolysis reaction chamber is provided with a heat preservation shell 29.
Specifically, the first microwave pyrolysis reaction chamber 28 and the second microwave pyrolysis reaction chamber 34 of this embodiment are installed in a vertical connection manner, and other embodiments may also be connected in a horizontal connection manner according to the actual installation site requirement.
Specifically, the material movement process of the microwave thermal analysis module is as follows: the waste salt enters a first microwave pyrolysis reaction chamber 28 from a solid material inlet 15 of the pyrolysis device, enters a second microwave pyrolysis reaction chamber 34 through a communicating pipe 30 under the action of a first material conveyor 19, is conveyed along the material movement direction under the action of a second material conveyor 32, and is finally discharged to a refining module through a solid material outlet 33 of the pyrolysis device.
As shown in fig. 6, the refining module comprises a salt dissolving sedimentation tank 44, a first filter press 45, an adsorption sedimentation tank 47, a second filter press 48, a filtrate tank 49, a preheater 51, a gas-liquid separator 52, a vapor compressor 58, an evaporator 59, a thickener 61, a centrifuge 62 and a dryer 64, the waste salt pyrolyzed by the microwave thermal desorption module enters the salt dissolving sedimentation tank 44 to be dissolved, the precipitated impurities such as fixed carbon and the like enter the first filter press to be removed, the saline solution enters the adsorption sedimentation tank 47 under the action of a saline solution pump 46, inorganic impurities in the brine are further removed by adding heavy metal catching agents, calcium, magnesium and other impurity removing agents, so as to ensure the quality of the subsequent evaporation crystallized salt product, the inorganic impurity precipitate is removed in the second filter press 48, the filtrate generated by the first filter press 45 and the second filter press 48 is temporarily stored in the filtrate tank 49, and then circularly enters the adsorption sedimentation tank 47.
The clean brine without inorganic impurities enters a gas-liquid separator 52 through a preheater 51 for concentration and crystallization, the generated secondary steam enters a steam compressor 58 through a gas-liquid separator secondary steam outlet 54 for compression, thereby increasing the enthalpy of the secondary steam in the system, the generated steam enters an evaporator 59 for heating and vaporization of brine, the steam after heat exchange enters the gas-liquid separator 52 again for recycling, the concentrated solution generated by the gas-liquid separator 52 is discharged to a thickener 61 through a gas-liquid separator concentrated solution outlet 56 for further concentration, then enters a centrifuge 62 for solid-liquid separation, the generated crystallized salt enters a dryer 64 for dehydration and then enters a finished product bin 65 to be used as industrial finished salt, the brine solution generated by the thickener 61 and the centrifuge 62 is temporarily stored in a mother liquor tank 63 for recycling, and the forced circulation pump 60 provides power for the evaporation and crystallization process.
As shown in fig. 5, the thermal desorption waste gas after heat exchange by the drying device enters a tail gas treatment module, the tail gas treatment module comprises a cyclone dust collector 36, a desulfurizing tower 38, an activated carbon adsorption tank 41, a fan 42 and a chimney 43, the thermal desorption waste gas firstly enters the cyclone dust collector 36 for dust removal, then enters the desulfurizing tower 38 for alkali liquid desulfurization, the desulfurized waste gas enters the activated carbon adsorption tank 41 for removing VOCS, and then is discharged to the chimney 43 through the fan 42, and the tail gas reaches the standard and is discharged.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an industrial waste salt resourceful treatment system which characterized in that: the microwave thermal desorption device comprises a pretreatment module, a drying module, a microwave thermal desorption module and a refining module which are connected in sequence;
the microwave thermal analysis module comprises a microwave thermal analysis module, a microwave thermal analysis reaction chamber, a microwave magnetron, a microwave thermal analysis module and a microwave thermal analysis module, wherein the heat insulation shell of the microwave thermal analysis module encloses the microwave thermal analysis reaction chamber, and the outer wall of the heat insulation shell is connected with the microwave magnetron through a waveguide;
and the material conveyor is arranged inside the heat-insulating shell and used for providing a material receiving and conveying working surface.
2. The system for recycling disposal of industrial waste salt according to claim 1, wherein: the microwave thermal desorption module is also internally provided with a vibration stirrer, and a stirring blade of the vibration stirrer is arranged close to the working surface of the material conveyor and is parallel to the running direction of the material conveyor;
furthermore, the vibration stirrer comprises a driving motor, a connecting rod assembly and a stirring blade assembly, wherein the connecting rod assembly comprises a main connecting rod and a plurality of branch connecting rods, one end of the main connecting rod is connected with one end of each branch connecting rod, and the other end of the main connecting rod is connected with the driving motor;
the other end of each branch connecting rod is provided with a stirring blade which is distributed at different positions of the working surface of the material conveyor.
3. The system for recycling disposal of industrial waste salt according to claim 1, wherein: the top of the heat-insulating shell is provided with a solid feeding hole, an air inlet and a thermal desorption waste gas outlet, wherein the solid feeding hole and the air inlet are positioned on the same side of the heat-insulating shell, and the thermal desorption waste gas outlet is positioned on the opposite side;
further, the solid material outlet is arranged at the bottom of the heat preservation shell and is positioned on the same side with the thermal desorption waste gas outlet.
4. The system for recycling disposal of industrial waste salt according to claim 1, wherein: a low-temperature thermal desorption area, a medium-temperature thermal desorption area and a high-temperature thermal desorption area are sequentially arranged in the thermal insulation shell from the material inlet end to the material outlet end;
furthermore, microwave magnetrons are arranged in the low-temperature thermal analysis area, the medium-temperature thermal analysis area and the high-temperature thermal analysis area, and the microwave efficiency is sequentially increased;
furthermore, temperature sensors are arranged in the low-temperature thermal desorption area, the medium-temperature thermal desorption area and the high-temperature thermal desorption area.
5. The system for recycling disposal of industrial waste salt according to claim 1, wherein: the material conveyor is a chain plate conveyor or a belt conveyor;
further, a driving roll shaft and a driven roll shaft of the material conveyor are respectively positioned at two ends of the interior of the heat-insulating shell;
furthermore, a material baffle is arranged between the feeding end of the material conveyor and the heat-insulating shell;
furthermore, baffles are arranged between two sides of the material conveyor and the heat insulation shell in a butting way or between two sides of the material conveyor and the heat insulation shell.
6. The system for recycling disposal of industrial waste salt according to claim 1, wherein: the pretreatment module comprises a waste salt pond, a first conveyor, a screening machine, a second conveyor and a crusher which are sequentially connected.
7. The system for recycling disposal of industrial waste salt according to claim 1, wherein: the dryer in the drying module is a rotary dryer;
further, a feed hopper of a drying device of the drying module is positioned below the crusher;
further, the tail end of the rotary dryer is provided with a drying device air inlet, and the front end of the rotary dryer is provided with a drying device air outlet;
furthermore, a discharge port of the drying device is arranged at the tail end of the rotary dryer.
8. The system for recycling disposal of industrial waste salt according to claim 1, wherein: the refining module comprises a purification system and a concentration system, and an outlet of the purification system is connected with an inlet of the concentration system;
further, the purification system comprises a salt dissolving sedimentation tank, a first pressure filter and a filtrate tank which are connected in sequence, wherein the adsorption sedimentation tank is connected with the salt dissolving sedimentation tank, and the adsorption sedimentation tank is connected with the filtrate tank through a second pressure filter;
furthermore, the filtrate tank is connected with the adsorption sedimentation tank through a filtrate pump;
further, the adsorption sedimentation tank is connected with a concentration system through a pipeline;
further, the concentration system comprises a preheater, a gas-liquid separator and a thickener which are connected in sequence, and the preheater is connected with the purification system;
furthermore, the device also comprises a centrifugal machine, wherein the centrifugal machine is connected with the thickener;
still further, the centrifugal dryer also comprises a dryer, and the dryer is connected with the centrifugal machine;
still further, the system also comprises a mother liquor tank and an evaporator, wherein a heat medium channel of the evaporator is communicated with the top of the gas-liquid separator; one end of a cold medium channel of the evaporator is connected with the mother liquor tank, and the other end of the cold medium channel of the evaporator is connected with the gas-liquid separator;
furthermore, a steam compressor is connected between the gas-liquid separator and the evaporator;
further, the heat medium outlet of the evaporator is connected with the preheater;
in some embodiments, the system further comprises an exhaust gas treatment module, wherein the exhaust gas treatment module comprises a cyclone dust collector, a desulfurizing tower, an activated carbon adsorption box and a chimney which are connected in sequence.
9. A method for recycling industrial waste salt is characterized by comprising the following steps: the method comprises the following steps:
pretreating and screening industrial waste salt to remove large impurities in the industrial waste salt, and crushing and screening the agglomerated waste salt;
drying the pretreated waste salt;
carrying out microwave thermal desorption on the dried waste salt to remove organic matters in the waste salt, and discharging thermal desorption waste gas after waste gas treatment;
and carrying out microwave thermal resolution on the obtained waste salt, and carrying out dissolution, solid-liquid separation, impurity removal by adsorption and evaporative crystallization to obtain the industrial finished salt.
10. The method for recycling industrial waste salt according to claim 9, characterized in that: the particle size of the crushed caked waste salt is less than 30 mm;
in some embodiments, the dried waste salt is subjected to graded microwave thermal desorption, and low-temperature thermal desorption, medium-temperature thermal desorption and high-temperature thermal desorption are sequentially performed;
further, the temperature of low-temperature thermal desorption is 150-300 ℃, the temperature of medium-temperature thermal desorption is 300-450 ℃, and the temperature of high-temperature thermal desorption is 450-550 ℃;
furthermore, the relative pressure in the microwave pyrolysis reaction chamber is-40 to-5 kPa;
in some embodiments, the specific steps of waste salt purification are: dissolving the waste salt with the organic matters removed, standing for layering, extracting supernatant, and adding an adsorbent;
collecting filtrate after filter pressing of the lower-layer precipitate, and discharging filter cakes;
adding the supernatant of the adsorbent, standing for layering, performing filter pressing on the lower-layer precipitate, discharging, and performing concentration after the filtrate reaches the standard;
further, the method also comprises the step of adding an adsorbent into the collected filtrate for purification.
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