CN215062091U - Dry incineration disposal system of waste salt of low middle-high temperature segmentation heating - Google Patents

Abstract

The invention discloses a waste salt drying and burning treatment system with low, medium and high temperature sectional heating, and particularly relates to the technical field of common industrial solid waste treatment, wherein the technical scheme is as follows: the flash evaporation low-temperature drying system comprises a flash evaporation low-temperature drying system, a primary medium-temperature airflow pulse drying system and a rotary kiln high-temperature calcining system, wherein the flash evaporation low-temperature drying system comprises a feeding screw conveyer and a flash evaporation dryer, a discharge hole of the feeding screw conveyer is connected with the flash evaporation dryer, the bottom of the flash evaporation dryer is connected with a flash evaporation drying blower, and one end of the flash evaporation drying blower is connected with a flash evaporation drying draught fan, and the flash evaporation low-temperature drying system has the beneficial effects that: different drying and calcining equipment is adopted to heat the industrial waste salt at low temperature, medium temperature and high temperature stages, so that water and organic matters in the industrial waste salt are removed in stages, the temperature of the industrial waste salt can be controlled, and the waste salt is prevented from slagging and caking in the process of oxidizing the organic matters at high temperature.

Description

Dry incineration disposal system of waste salt of low middle-high temperature segmentation heating

Technical Field

The invention relates to the field of general industrial solid waste treatment, in particular to a waste salt drying and incineration treatment system with low, medium and high temperature sectional heating.

Background

Industrial waste salt is mainly generated in primary solid-liquid separation, solution concentration crystallization and sewage treatment processes in industrial production processes of pesticide intermediates, drug synthesis, printing and dyeing and the like, and has the characteristics of various types, complex components, numerous sources, high treatment cost, great environmental hazard and the like, wastes such as distillation and reaction residues, waste mother liquor, reaction tank and container cleaning waste liquid and the like in various production processes are formally listed in a dangerous waste list in 2016, in recent years, the waste salt production in China is continuously increased, the annual production is estimated to be more than 500 ten thousand t, wherein the pesticide accounts for 30 percent, the fine chemical industry accounts for 15 percent, the medicine accounts for 10 percent, and the others account for 45 percent, at present, the waste salt is generally treated by a centralized temporary storage mode of enterprise and warehouse construction, but how to carry out thorough harmless resource treatment and how to carry out the resource recycling treatment become a realistic problem to be solved urgently, the method is widely concerned by all the social circles.

The prior art has the following defects: the existing industrial waste salt treatment technology mainly comprises a landfill method, a high-temperature pyrolysis method and high-temperature incineration, wherein in the landfill method, after waste salt is solidified by concrete and the like, the waste salt is sent into a rigid landfill site according to the landfill technical specification for sanitary landfill treatment, a high-temperature pyrolysis method is also called high-temperature carbonization and dry distillation, namely, the waste salt is heated under the condition of oxygen isolation, the combustible solid waste is decomposed at high temperature and finally becomes combustible gas, oil and solid carbon which enter smoke or are remained in waste salt, residual organic components are difficult to control, the purity of the finished salt after treatment is low, the waste salt is heated to 700-800 ℃ by a high-temperature burning method, because sufficient oxygen is stored in the incineration process, the organic matters can be completely oxidized and decomposed under the high-temperature condition, but because the fluctuation of the melting point interval of the waste salt is large, adverse phenomena such as slag bonding, caking and the like are easily generated in the high-temperature incineration treatment process, and the process stability is influenced.

Therefore, the invention is necessary to invent a waste salt drying and incineration treatment system with low, medium and high temperature sectional heating.

Disclosure of Invention

The invention provides a waste salt drying and burning treatment system with low-medium-high temperature sectional heating, which heats industrial waste salt by adopting different drying and burning devices at low-temperature, medium-temperature and high-temperature stages respectively, removes water and organic matters in the industrial waste salt by stages, simultaneously controls the temperature by stages, is favorable for reliably controlling the temperature of the industrial waste salt, further ensures that the waste salt does not generate slag bonding and caking in the process of oxidizing the organic matters at high temperature, and solves the problems that combustible solid waste is decomposed at high temperature, finally becomes combustible gas, oil and solid carbon and enters smoke or remains in the waste salt, the remaining organic components are difficult to control, the purity of the finished salt after treatment is low, and adverse phenomena of slag bonding, caking and the like are easy to generate in the high-temperature burning treatment process, and the process stability is influenced.

In order to achieve the above purpose, the invention provides the following technical scheme: a waste salt drying and burning treatment system with low, medium and high temperature sectional heating comprises a flash evaporation low-temperature drying system, a primary medium-temperature airflow pulse drying system and a rotary kiln high-temperature calcining system, wherein the flash evaporation low-temperature drying system comprises a feed screw conveyor and a flash evaporation dryer, a discharge port of the feed screw conveyor is connected with the flash evaporation dryer, the bottom of the flash evaporation dryer is connected with a flash evaporation drying blower, one end of the flash evaporation drying blower is connected with a flash evaporation drying draught fan, the top of the flash evaporation dryer is connected with a first cyclone separator, one end of the cyclone separator is connected with a second cyclone separator, an exhaust port of the second cyclone separator is connected with a bag-type dust collector, one end of the bag-type dust collector is connected with the draught fan, and the bottoms of the first cyclone separator and the second cyclone separator are connected with a buffer bin through a star-type ash discharge valve;

the primary medium-temperature airflow pulse drying system comprises a distributor, the left end of the distributor is connected with a hot blast stove, one side of the output end of the hot blast stove is connected with a kiln tail flue of the rotary kiln, the right end of the distributor is connected with a pulse drying pipe, the right end of the pulse drying pipe is connected with a cyclone separator III, one end of the cyclone separator III is connected with a cyclone separator IV, and the bottom ends of the cyclone separator III and the cyclone separator IV are connected with a primary material bin;

the rotary kiln high-temperature calcination system comprises a rotary kiln front bunker, a discharge port of the rotary kiln front bunker is connected with a third screw conveyor, and a discharge port of the third screw conveyor is connected with the rotary kiln;

the rotary kiln consists of an inner sleeve and an outer sleeve, and a material guide plate, a vibrator, a guide plate and a baffle plate are arranged inside the inner sleeve of the rotary kiln;

one end of the flash evaporation low-temperature drying system is connected with the primary medium-temperature airflow pulse drying system, and one end of the primary medium-temperature airflow pulse drying system is connected with the rotary kiln high-temperature calcining system.

Preferably, the discharge port of the buffer bin is connected with the first screw conveyor.

Preferably, a discharge port of the screw conveyer is connected with the distributor.

Preferably, one end of the flash drying induced draft fan is connected with the cyclone separator IV.

Preferably, the discharge port of the first-stage storage bin is connected with a second screw conveyor through a star-shaped ash discharge valve.

Preferably, the second discharge hole of the screw conveyer is connected with the front bunker of the rotary kiln.

Preferably, the kiln head of the rotary kiln is provided with a kiln head gas burner.

Preferably, burners are arranged in the axial direction of the rotary kiln, one ends of the burners are located in an interlayer space between the inner cylinder and the outer cylinder of the rotary kiln, and at least one group of burners is arranged.

Preferably, one end of the rotary kiln is connected with a tail flue of the rotary kiln.

Preferably, the kiln head of the rotary kiln is inclined downwards by 1-3 degrees, and an interlayer between the inner cylinder and the outer cylinder of the rotary kiln is a heat source space for indirect heating.

The invention has the beneficial effects that:

1, heating industrial waste salt by adopting different drying and calcining equipment at low temperature, medium temperature and high temperature stages, removing water and organic matters in the industrial waste salt by stages, being beneficial to reliably controlling the temperature of the industrial waste salt and ensuring that the waste salt is not subjected to slag bonding and caking in the process of oxidizing the organic matters at high temperature;

2, the flue gas of the flash evaporation low-temperature drying system enters from the annular space at the bottom of the flash evaporation dryer in the tangential direction and rises spirally, so that the flue gas can perform full and efficient mass heat exchange with waste salt, the heat exchange efficiency is greatly improved, and the moisture in the waste salt can be completely removed;

3 pulse drying is adopted in the middle temperature section aiming at the characteristics of waste salt, a reducing pipe body is adopted in the pulse drying pipe from bottom to top, the gas-solid two-phase flow is decelerated due to expanding and accelerated due to reducing, the relative speed and the heat transfer area between hot air and particles are large, and the heat and mass transfer rate is enhanced;

4, the flue gas at the kiln tail flue of the rotary kiln high-temperature calcination system is mixed with the high-temperature flue gas generated by the hot blast stove to realize the gradient utilization of energy, so that the energy utilization efficiency is improved;

and 5, the calcination of the rotary kiln is carried out by adopting a method of combining direct heating and indirect heating, so that organic matters are completely removed in the process that the waste salt moves from the kiln head to the kiln tail.

Drawings

FIG. 1 is a schematic view of the overall flow structure provided by the present invention;

FIG. 2 is a schematic view of a flow structure of a flash evaporation low-temperature drying system provided by the present invention;

fig. 3 is a schematic view of a flow structure of a primary medium-temperature air flow pulse drying system provided by the present invention.

In the figure: the device comprises a feeding screw conveyor 1, a flash drying machine 2, a flash drying induced draft fan 3, a flash drying blower 4, a cyclone separator I5, a cyclone separator II 6, a bag type dust collector 7, an induced draft fan 8, a buffer bin 9, a screw conveyor I10, a distributor 11, a hot blast stove 12, a rotary kiln tail flue 13, a pulse drying pipe 14, a cyclone separator III 15, a cyclone separator IV 16, a first-stage bin 17, a screw conveyor II 18, a rotary kiln front bin 19, a screw conveyor III 20, a rotary kiln 21, a kiln head gas burner 22, a burner 23, a flash low-temperature drying system 100, a first-stage medium-temperature airflow pulse drying system 200 and a rotary kiln high-temperature calcining system 300.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Referring to fig. 1-fig. 3, the waste salt drying and burning treatment system with low, medium and high temperature staged heating provided by the present invention comprises a flash evaporation low-temperature drying system 100, a primary medium temperature air flow pulse drying system 200 and a rotary kiln high-temperature calcining system 300;

further, flash distillation low temperature drying system 100 includes pan feeding screw conveyer 1 and flash dryer 2, pan feeding screw conveyer 1 discharge gate is connected flash dryer 2, flash drying air-blower 4 is connected to flash dryer 2 bottom, flash drying air-blower 3 is connected to flash drying air-blower 4 one end, cyclone 5 is connected at 2 tops of flash dryer, cyclone two 6 is connected to cyclone 5 one end, cyclone two 6 gas vent connection bag collector 7, draught fan 8 is connected to bag collector 7 one end, cyclone 5 with cyclone two 6 bottoms are through star type unloading valve connection buffering feed bin 9, and is concrete, pan feeding screw conveyer 1 has the effect of carrying waste salt in flash dryer 2, and flash dryer 2 is collection drying machine 2, A novel continuous drying device integrated with crushing is characterized in that flue gas from a primary medium-temperature air flow pulse drying system 200 and a rotary kiln high-temperature calcining system 300 is sent into an annular space at the bottom of a flash evaporation dryer 2 through a flash evaporation drying draught fan 3 and a flash evaporation drying blower 4, a cyclone separator is a device for gas-solid separation, the working principle is that the rotating motion caused by tangential introduction of air flow is utilized, solid particles with larger inertial centrifugal force are thrown to an outer wall surface to be separated, the first cyclone separator 5 and the second cyclone separator 6 have the effect of realizing two-stage cyclone separation, a bag type dust collector 7 is a dry dust filtering device and is suitable for collecting fine, dry and non-fibrous dust, the bag type dust collector 7 has the effect of purifying the flue gas after gas-solid separation, the draught fan 8 generates negative pressure through rotation of an impeller, and then air is extracted from the system or the device, draught fan 8 has the effect of discharging into the chimney with the flue gas that satisfies emission standard, star type unloading valve is used for installing the discharge opening department at the tripper of work under the burden, tripper exhaust material is accepted on upper portion, rely on rotatory impeller to play the effect of transported substance, again, take on sealed effect, prevent that air from inhaling from the discharge opening among the pneumatic conveying process, guarantee the normal row of tripper and expect, cyclone 5 and cyclone two 6 have the effect of discharging the waste salt after the gas-solid separation into in the buffer bin 9 through star type unloading valve, buffer bin 9 has the effect of placing the waste salt.

Further, the primary medium-temperature air flow pulse drying system 200 comprises a distributor 11, the left end of the distributor 11 is connected with a hot blast stove 12, one side of the output end of the hot blast stove 12 is connected with a kiln tail flue 13 of the rotary kiln, the right end of the distributor 11 is connected with a pulse drying pipe 14, the right end of the pulse drying pipe 14 is connected with a cyclone separator III 15, one end of the cyclone separator III 15 is connected with a cyclone separator IV 16, the bottom ends of the cyclone separator III 15 and the cyclone separator IV 16 are connected with a primary bin 17, specifically, the distributor 11 has a material distribution function, the hot blast stove 12 is a direct heat source of a flash evaporation low-temperature drying system and a medium-temperature calcining system, combustible gas is adopted for direct combustion, the obtained high-temperature flue gas is mixed with the kiln tail flue gas in the rotary kiln high-temperature calcining system 300 to realize effective utilization of the energy, and is in direct contact with waste salt through the pulse drying pipe 14, the waste salt is calcined, the pulse drying pipe 14 adopts a reducing pipe body from bottom to top, gas-solid two-phase flow is decelerated due to expansion and accelerated due to shrinkage, the relative speed and the heat transfer area between hot air and particles are large, the heat transfer and mass transfer rate is enhanced, the third cyclone separator 15 and the fourth cyclone separator 16 have the effect of realizing two-stage cyclone separation, and the first-stage storage bin 17 has the effect of placing the separated waste salt.

Further, the rotary kiln high-temperature calcination system 300 comprises a rotary kiln front bin 19, a discharge port of the rotary kiln front bin 19 is connected with a third screw conveyor 20, a discharge port of the third screw conveyor 20 is connected with a rotary kiln 21, specifically, the working principle of the screw conveyor is that a rotary screw blade pushes a material to convey the material, the force of the material not rotating together with the screw conveyor blade is the self weight of the material and the friction resistance of a shell of the screw conveyor to the material, the effect of controlling the feeding amount of the rotary kiln 21 is achieved by adjusting the frequency of the third screw conveyor 20, and the rotary kiln 21 is commonly called a rotary kiln.

Further, the rotary kiln 21 is composed of an inner sleeve and an outer sleeve, a guide plate, a vibrator, a guide plate and a baffle plate are arranged inside the inner sleeve of the rotary kiln 21, specifically, the guide plate has a guide function, the vibrator has a hammering function on the rotary kiln 21, the guide plate has a flow guide function, and the baffle plate has a function of increasing the retention time of the flue gas in the rotary kiln 21.

Further, one end of the flash evaporation low-temperature drying system 100 is connected to the primary medium-temperature air flow pulse drying system 200, and one end of the primary medium-temperature air flow pulse drying system 200 is connected to the rotary kiln high-temperature calcining system 300.

Further, the discharge port of the buffer bin 9 is connected with a first screw conveyor 10, and particularly, the buffer bin 9 has the function of conveying waste salt to the distributor 11 through the first screw conveyor 10.

Further, a discharge port of the first screw conveyor 10 is connected with the distributor 11.

Further, the flash drying draught fan 3 one end is connected cyclone four 16, and specifically, the flash drying draught fan 3 has the effect of introducing the flue gas after cyclone four 16 separates into flash drying air-blower 4.

Further, the discharge port of the first-level storage bin 17 is connected with the second screw conveyor 18 through a star-shaped ash discharge valve, and specifically, the first-level storage bin 17 has the function of conveying waste salt into the second screw conveyor 18 through the star-shaped ash discharge valve.

Further, the discharge hole of the second screw conveyor 18 is connected with the rotary kiln front bunker 19, and specifically, the second screw conveyor 18 has the function of conveying waste salt into the rotary kiln front bunker 19.

Further, a kiln head gas burner 22 is installed at the kiln head of the rotary kiln 21, and specifically, the kiln head gas burner 22 has an effect of directly calcining the waste salt entering the rotary kiln 21.

Further, the rotary kiln 21 is provided with burners 23 in the axial direction, one end of each burner 23 is located in the interlayer space between the inner cylinder and the outer cylinder of the rotary kiln 21, the burners 23 are at least one group, specifically, the burners are commonly known as combustion devices used in industrial fuel furnaces, which can be understood as short as a nozzle for firing, generally referred to as a combustion device body part, and have a fuel inlet, an air inlet and a jet hole, which play a role in distributing fuel and combustion air and jetting the fuel and the combustion air in a certain manner for combustion, and the burners 23 are preferably 4 groups, and have a role in improving indirect heating heat by locating one end of each burner 23 in the interlayer space between the inner cylinder and the outer cylinder of the rotary kiln 21.

Further, one end of the rotary kiln 21 is connected with a rotary kiln tail flue 13, and specifically, the rotary kiln tail flue 13 has an effect of discharging flue gas in the rotary kiln 21 to an output end of the hot blast stove 12.

Furthermore, the kiln head of the rotary kiln 21 is inclined downwards by 1-3 degrees, and an interlayer between an inner cylinder and an outer cylinder of the rotary kiln 21 is a heat source space for indirect heating.

The using process of the invention is as follows: flash low temperature drying system 100 when using the present invention: waste salt is sent into a flash dryer 2 from a feeding screw conveyor 1, flue gas from a primary medium-temperature airflow pulse drying system 200 and a rotary kiln high-temperature calcining system 300 is sent into an annular gap at the bottom of the flash dryer 2 by a flash drying induced draft fan 3 and a flash drying blower 4, enters in a tangential direction and rises spirally, and performs full and efficient mass heat exchange with the waste salt, water in the waste salt is completely removed in the process, the dried waste salt is conveyed to a cyclone separator I5 and a cyclone separator II 6 along with hot flue gas to realize two-stage cyclone separation, and after the flue gas after gas-solid separation is purified by a bag type dust collector 7, the flue gas meeting the emission standard is discharged into a chimney by an induced draft fan 8 and then is discharged; waste salt enters a buffer bin 9 through a star-shaped ash discharge valve at the bottom of a first cyclone separator 5 and a second cyclone separator 6 and is then conveyed into a first-stage medium-temperature air flow pulse drying system 200 through a first screw conveyor 10;

first-stage medium-temperature airflow pulse drying system: the waste salt dried by the flash evaporation low-temperature drying system 100 is stored in a buffer bin 9, and is conveyed to a distributor 11 in a primary medium-temperature airflow pulse drying system 200 through a screw conveyor I10, and then is conveyed to a pulse drying pipe 14 through the distributor 11, a hot blast stove 12 and kiln tail flue 13 flue gas of the rotary kiln, the pulse drying pipe 14 adopts a reducing pipe body from bottom to top, gas-solid two-phase flow decelerates due to diameter expansion and accelerates due to diameter reduction, the relative speed and heat transfer area between hot air and particles are large, and the heat transfer mass transfer rate is enhanced, the hot blast stove 12 is a direct heat source of the flash evaporation low-temperature drying system 100 and the primary medium-temperature airflow pulse drying system 200, combustible gas is adopted for direct combustion, the obtained high-temperature flue gas is mixed with the kiln tail flue gas in the rotary kiln high-temperature calcining system 300 to realize effective utilization of energy, and is directly contacted with the waste salt through the pulse drying pipe 14, calcining the waste salt, mixing the waste salt and the waste salt, introducing the mixture into a pulse drying pipe 14, introducing the mixed waste salt into a first-stage bin 17 through two-stage cyclone separation of a cyclone separator III 15 and a cyclone separator IV 16, storing the waste salt, conveying the waste salt into a front bin 19 of a rotary kiln through a star-shaped ash discharge valve and a screw conveyor II 18 in the first-stage bin 17 to be used as a high-temperature calcined raw material, further drying the waste salt in the first-stage medium-temperature calcination process, and removing part of organic matters;

the rotary kiln high-temperature calcining system comprises: the waste salt stored in a front storage bin 19 of the rotary kiln is controlled by adjusting the frequency of a third screw conveyor 20 under the front storage bin to control the feeding amount of the rotary kiln 21, the rotary kiln 21 consists of an inner sleeve and an outer sleeve, a guide plate, a vibrator, a guide plate and a baffle plate are arranged in the inner cylinder of the rotary kiln 21, the kiln head of the rotary kiln 21 inclines downwards 1-3 degrees, the waste salt enters from the kiln head of the inner cylinder and is gradually sent to the kiln tail under the action of the rotation of the cylinder and the guide plate, the rotary kiln calcination is carried out by adopting a method combining direct heating and indirect heating, a kiln head gas burner 22 is arranged at the kiln head of the inner cylinder to directly calcine the waste salt entering the rotary kiln, an interlayer of the inner cylinder and the outer cylinder is a heat source space for indirect heating, a burner 23 is arranged along the axial direction of the rotary kiln 21, fuel is combusted in the interlayer to heat a steel plate, the waste salt contacted with the heated steel plate is heated to play a role of indirect calcination, in the process that the waste salt moves towards the tail of the kiln, organic matters are completely removed, and a baffle plate is arranged in the kiln to prolong the retention time of the flue gas in the kiln, so that the heat transfer effect is greatly improved; meanwhile, the vibrator is arranged, under the hammering action of the vibrator, waste salt adhered to the kiln wall of the rotary kiln 21 due to high-temperature calcination can fall off from the kiln wall, so that the problems of slagging and caking in the calcination process are solved, industrial salt with qualified purity is obtained through a secondary calcination device of the rotary kiln, and is conveyed to a finished product bin for storage after being cooled by a water-cooling conveying screw.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a dry incineration disposal system of waste salt of low well high temperature sectional heating, includes flash distillation low temperature drying system (100), one-level medium temperature air current pulse drying system (200) and rotary kiln high temperature system (300) of calcining, its characterized in that: the flash evaporation low-temperature drying system (100) comprises a feed screw conveyor (1) and a flash evaporation dryer (2), a discharge hole of the feed screw conveyor (1) is connected with the flash evaporation dryer (2), the bottom of the flash evaporation dryer (2) is connected with a flash evaporation drying blower (4), one end of the flash evaporation drying blower (4) is connected with a flash evaporation drying draught fan (3), the top of the flash evaporation dryer (2) is connected with a first cyclone separator (5), one end of the first cyclone separator (5) is connected with a second cyclone separator (6), an exhaust port of the second cyclone separator (6) is connected with a bag type dust collector (7), one end of the bag type dust collector (7) is connected with a draught fan (8), and the bottoms of the first cyclone separator (5) and the second cyclone separator (6) are connected with a buffer bin (9) through a star-shaped ash discharge valve;

the primary medium-temperature airflow pulse drying system (200) comprises a distributor (11), the left end of the distributor (11) is connected with a hot blast stove (12), one side of the output end of the hot blast stove (12) is connected with a kiln tail flue (13) of the rotary kiln, the right end of the distributor (11) is connected with a pulse drying pipe (14), the right end of the pulse drying pipe (14) is connected with a third cyclone separator (15), one end of the third cyclone separator (15) is connected with a fourth cyclone separator (16), and the bottom ends of the third cyclone separator (15) and the fourth cyclone separator (16) are connected with a primary storage bin (17);

the rotary kiln high-temperature calcination system (300) comprises a rotary kiln front bin (19), a discharge hole of the rotary kiln front bin (19) is connected with a third screw conveyor (20), and a discharge hole of the third screw conveyor (20) is connected with a rotary kiln (21);

the rotary kiln (21) consists of an inner sleeve and an outer sleeve, and a material guide plate, a vibrator, a guide plate and a baffle plate are arranged inside the inner cylinder of the rotary kiln (21);

one end of the flash evaporation low-temperature drying system (100) is connected with the primary medium-temperature airflow pulse drying system (200), and one end of the primary medium-temperature airflow pulse drying system (200) is connected with the rotary kiln high-temperature calcining system (300).

2. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: and a discharge hole of the buffer bin (9) is connected with a first screw conveyor (10).

3. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 2, wherein: the discharge hole of the first screw conveyor (10) is connected with the distributor (11).

4. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: one end of the flash drying draught fan (3) is connected with the cyclone separator IV (16).

5. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: and the discharge hole of the first-stage storage bin (17) is connected with a second screw conveyor (18) through a star-shaped ash discharge valve.

6. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 5, wherein: and the discharge hole of the second screw conveyor (18) is connected with the front storage bin (19) of the rotary kiln.

7. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: and a kiln head gas burner (22) is arranged at the kiln head of the rotary kiln (21).

8. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: the axial direction of rotary kiln (21) is provided with nozzle (23), the one end of nozzle (23) is located in the intermediate layer space of rotary kiln (21) inner tube and urceolus, nozzle (23) are a set at least.

9. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: one end of the rotary kiln (21) is connected with a tail flue (13) of the rotary kiln.

10. The waste salt drying and incineration disposal system with low, medium and high temperature and sectional heating function as claimed in claim 1, wherein: the kiln head of the rotary kiln (21) is inclined downwards by 1-3 degrees, and an interlayer between an inner cylinder and an outer cylinder of the rotary kiln (21) is a heat source space for indirect heating.

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