阅读说明：本技术 一种固废热解液相产物熔盐梯级处理除杂提质装置 (Solid waste pyrolysis liquid phase product fused salt gradient treatment impurity removal and quality improvement device ) 是由 胡红云 高强 姚洪 李爱军 杨福 杨宇涵 邓雨婷 徐凯 于 2020-04-20 设计创作，主要内容包括：本发明实施例提供了一种固废热解液相产物熔盐梯级处理除杂提质装置。所述装置包括焦油分级单元、熔盐梯级热处理单元、梯级冷凝处理单元、熔盐再生单元、料液回收单元和尾气处理单元。所述装置工作时,将固废热解液相产物沉降分级处理后送入二级熔盐反应器进行梯级热处理,产生的熔渣进一步再生再返回熔盐反应器；反应产物进入两级冷凝器,实现气液分离,二级液相产物再用作工质进入冷却循环系统用于一级冷凝器冷却,循环后分离液体进入储液罐,产生的气体进一步尾气处理再利用。本发明所述装置解决了固废热解液相产物利用率低以及可能引起的二次污染等问题,实现了固废热解液相产物综合处理和资源化利用的技术目标。(The embodiment of the invention provides a solid waste pyrolysis liquid phase product molten salt gradient treatment impurity removal and quality improvement device. The device comprises a tar grading unit, a molten salt step heat treatment unit, a step condensation treatment unit, a molten salt regeneration unit, a feed liquid recovery unit and a tail gas treatment unit. When the device works, the solid waste pyrolysis liquid phase product is subjected to sedimentation and grading treatment and then is sent to a secondary molten salt reactor for step heat treatment, and the generated molten slag is further regenerated and then returns to the molten salt reactor; the reaction product enters a two-stage condenser to realize gas-liquid separation, a second-stage liquid-phase product is used as a working medium to enter a cooling circulation system for cooling the first-stage condenser, the separated liquid enters a liquid storage tank after circulation, and the generated gas is further treated and reused by tail gas. The device solves the problems of low utilization rate of solid waste pyrolysis liquid phase products, possible secondary pollution and the like, and achieves the technical aims of comprehensive treatment and resource utilization of the solid waste pyrolysis liquid phase products.)

1. The utility model provides a solid useless pyrolysis liquid phase product fused salt step is handled edulcoration upgrading device which characterized in that, includes tar grading unit (1), fused salt step heat treatment unit (2), step condensation processing unit (3), fused salt regeneration unit (4), feed liquid recovery unit (5) and tail gas processing unit (6), wherein:

the tar grading unit (1) comprises a natural settling tank (11), a feed inlet is formed in the top of the natural settling tank (11), the tank body is divided into a light component partition, a medium component partition and a heavy component partition from top to bottom according to the density gradient distribution of solid waste pyrolysis liquid phase product raw materials, a first liquid outlet (112) is formed in the light component partition, a second liquid outlet (113) is formed in the medium component partition, and a slag hopper (114) is arranged at the bottom of the heavy component partition;

the molten salt step heat treatment unit (2) comprises a primary molten salt reactor (21) and a secondary molten salt reactor (22), wherein the top of each reactor is provided with a feeding hole, and the side wall of each reactor is provided with a molten salt return hole; a first gas outlet (212) is formed in the side wall of the primary molten salt reactor (21), and a first molten salt separator (213) is arranged at the bottom of the primary molten salt reactor; a second gas outlet (222) is formed in the side wall of the secondary molten salt reactor (22), and a second molten salt separator (223) is arranged at the bottom of the secondary molten salt reactor; each molten salt separator is provided with a discharge port; the first gas outlet (212) is communicated with a feed inlet of the secondary molten salt reactor (22), the first liquid outlet (112) is communicated with a feed inlet of the secondary molten salt reactor (22), and the second liquid outlet (113) is communicated with a feed inlet of the primary molten salt reactor (21); the discharge ports of the first molten salt separator (213) and the second molten salt separator (223) are connected with the molten salt regeneration unit (4), and the molten salt regenerated in the molten salt regeneration unit (4) is reintroduced into the primary molten salt reactor (21) and the secondary molten salt reactor (22) through the molten salt return port respectively;

the cascade condensation processing unit (3) comprises a first-stage condenser (31), a second-stage condenser (32) and a cooling circulation system which is connected with the condensers in series for heat exchange; the top of each condenser is provided with an air inlet, the bottoms of the primary condenser (31) and the secondary condenser (32) are respectively and correspondingly provided with a first gas-liquid separator (311) and a second gas-liquid separator (322), each gas-liquid separator is respectively provided with an air outlet and an air outlet, and the cooling circulation system is provided with an air outlet; the second air outlet (222) is communicated with an air inlet of the primary condenser (31); the gas outlet of the first gas-liquid separator (311) is communicated with the gas inlet of the secondary condenser (32), and the liquid outlet is communicated with the feed liquid recovery unit (5); a liquid outlet of the second gas-liquid separator (322) is communicated with the cooling circulation system to send the separated liquid-phase product into the cooling circulation system as a circulating working medium, and a gas outlet of the second gas-liquid separator is communicated with the gas discharged by the tail gas treatment unit (6);

the tail gas processing unit (6) is provided with a liquid outlet, the feed liquid recovery unit (5) with cooling circulation system's liquid outlet with the liquid outlet of tail gas processing unit (6) communicates respectively.

2. The apparatus of claim 1, wherein a check valve is arranged in a pipeline of the first liquid outlet (112) communicated with the feed inlet of the secondary molten salt reactor (22).

3. The apparatus according to claim 1, wherein the tar fractionation unit (1) further comprises a heater (12), and the heater (12) is disposed in a pipeline where the second liquid outlet (113) communicates with a feed port of the primary molten salt reactor (21).

4. The apparatus according to claim 1, wherein the natural settling tank (11) is provided at a feed inlet thereof with a liquid distributor (111) for feeding a solid waste pyrolysis liquid phase product raw material and at a top thereof with an ultrasonic distance meter (115) for controlling an amount of the raw material to be added.

5. The apparatus according to claim 1, characterized in that the primary molten salt reactor (21) is provided with a first atomizer (211) at its inlet and a first ultrasonic distance meter (215) at its top; the second-stage molten salt reactor (22) is provided with a second atomizer (221) at an air inlet thereof, and a first ultrasonic distance meter (225) at the top thereof.

6. The apparatus according to claim 1, characterized in that the primary molten salt reactor (21) is provided with a first overpressure valve (216) at its side wall and a temperature monitor first thermometer (214) at its 1/3 level; the side wall of the secondary molten salt reactor (22) is provided with a second overpressure valve (226), and the height of 1/3 is provided with a second temperature measuring instrument (224) of a temperature monitor.

7. The plant according to claim 1, characterized in that the cooling circulation system comprises a compressor (33), a gas cooler (34), a condenser (35) and a three-phase separator (36) in series in the order named, wherein: and the gas-phase product separated by the three-phase separator (36) enters the cooling circulation system, and the separated liquid-phase product is discharged from a liquid outlet of the cooling circulation system.

8. The device according to any one of claims 1 to 7, characterized in that the molten salt regeneration unit (4) comprises a first molten salt storage bin (411) and a first molten salt mixer (412) connected above the first molten salt storage bin (411), wherein the outlet of the first molten salt storage bin (411) is communicated with a molten salt return port of the primary molten salt reactor (21) through a pump; the molten salt mixer further comprises a second molten salt storage bin (421) and a second molten salt mixer (422) connected above the second molten salt storage bin, wherein an outlet of the second molten salt storage bin (421) is communicated with a molten salt return port of the secondary molten salt reactor (22) through a pump.

9. The apparatus according to any one of claims 1 to 7, wherein the feed liquid recovery unit (5) comprises a first liquid storage tank (51) and a second liquid storage tank (52), the first liquid storage tank (51) is communicated with the liquid outlet of the first gas-liquid separator (311), and the second liquid storage tank (52) is communicated with the liquid outlet of the cooling circulation system and the liquid outlet of the tail gas treatment unit (6).

10. The apparatus according to any one of claims 1 to 7, characterized in that the off-gas treatment unit (6) comprises a cyclone separator (61), a fan (62) and a gas drier (63), and the outlet of the second gas-liquid separator (322) is communicated with the inlet of the cyclone separator (61); the gas separated by the cyclone separator (61) is introduced into the gas drier (63) through the fan (62), and the gas is discharged from the gas drier (63); and liquid separated by the cyclone separator (61) is sent into the feed liquid recovery unit (5) through a liquid outlet of the tail gas treatment unit (6).

Technical Field

The invention belongs to the technical field of solid waste treatment, and particularly relates to a solid waste pyrolysis liquid phase product molten salt gradient treatment impurity removal and quality improvement device.

Background

Solid waste often can produce higher proportion liquid phase product in the pyrolysis treatment process, and these solid waste pyrolysis liquid phase products because viscosity is high, thermal stability is poor and have certain corrosivity usually, can lead to producing pipeline adhesion jam, corrosion perforation scheduling problem in the production process unavoidably, if fail in time to handle still can cause further harm, have not only reduced production efficiency, have threatened production safety even seriously. In addition, the solid waste pyrolysis liquid phase product has the characteristics of high carbon, high hydrogen, various organic compounds and the like, has certain potential when being used as fuel and used for chemical refining, and is easy to cause environmental pollution in the using process. Based on the application prospect of the solid waste pyrolysis liquid phase product, the related research of removing impurities and improving quality of the solid waste pyrolysis liquid phase product has attracted wide attention currently.

At present, the treatment mode of solid waste pyrolysis liquid phase products mainly comprises physical separation and chemical conversion, wherein the physical separation method mainly comprises a solvent extraction method, a distillation method, a supercritical extraction method, a membrane separation method, a crystallization separation method, a chromatography method and the like, and the chemical conversion method mainly comprises catalytic hydrogenation, catalytic cracking, a plasma cracking method and the like. Chinese patent document CN109233887A discloses a tar separation unit and a tar separation device, which realize physical separation of oil and water vapor, but require a large amount of cooling water for heat exchange during operation. Chinese patent document CN1676583A describes a medium-high temperature coal tar hydrocracking process, wherein medium-high temperature coal tar is introduced into a heating furnace to be mixed with hydrogen, the mixture enters a hydrofining reactor, the hydrogen separated from a high-pressure separator after heat exchange is sent back to the hydrofining reactor through a recycle hydrogen compressor, the generated oil enters a low-pressure separator, the low-fraction fuel oil is separated and enters a deoxygenation tower, the fuel gas is further removed and then enters a fractionating tower to be fractionated, so that gasoline, diesel oil and lubricating oil are obtained, and the tail oil enters the hydrocracking reactor; in the technical scheme, the medium-high temperature coal tar contains a large amount of components such as metals which are easy to cause catalyst deactivation and bed pressure drop increase, and the components are directly treated by a traditional hydrofining reactor without pre-treating raw materials, so that the catalyst deactivation speed is accelerated, the bed pressure drop is increased, and the running period of the device is shortened. Chinese patent document CN107510955A also provides a catalytic cracking process and apparatus, the present invention adopts three-stage catalytic cracking reaction to improve propylene yield and simultaneously slow down dry gas and coke yield, but the problem of carbon deposition of the catalyst in the treatment process hinders its large-scale use.

At present, the fused salt heat treatment technology is applied to the technical field of pyrolysis liquid phase product treatment, has obvious advantages, can realize impurity removal, quality improvement and high purification degree of liquid phase products, and can provide a good heat treatment environment with high heat and mass transfer rates. However, because the components of the solid waste pyrolysis liquid phase product are mixed, the difficulty of classifying and collecting the products formed by treatment is huge, the treatment of the solid waste pyrolysis liquid phase product by the existing molten salt heat treatment technology is not high enough, the energy conversion utilization rate is low, and the secondary pollution is easy to cause. Therefore, a new fused salt heat treatment technology for solid waste pyrolysis liquid phase products is urgently needed to be developed so as to treat the solid waste pyrolysis liquid phase products more efficiently.

Disclosure of Invention

The invention aims to solve the technical problems that the treatment of solid waste pyrolysis liquid phase products is low in efficiency, the energy conversion utilization rate is low and secondary pollution is easily caused by the conventional molten salt heat treatment technology, and provides the solid waste pyrolysis liquid phase product molten salt step treatment impurity removal and quality improvement device, which can reduce the energy consumption of solid waste pyrolysis liquid phase product impurity removal and quality improvement treatment, improve the recycling efficiency of substances and energy and better realize the comprehensive treatment and resource utilization of the solid waste pyrolysis liquid phase products.

In order to solve the technical problems, an embodiment of the invention provides a solid waste pyrolysis liquid phase product molten salt step treatment impurity removal and quality improvement device, which comprises a tar grading unit, a molten salt step heat treatment unit, a step condensation treatment unit, a molten salt regeneration unit, a feed liquid recovery unit and a tail gas treatment unit, wherein:

the tar grading unit comprises a natural settling tank, a feed inlet is formed in the top of the natural settling tank, the tank body is divided into a light component partition, a medium component partition and a heavy component partition from top to bottom according to the density gradient distribution of solid waste pyrolysis liquid phase product raw materials, a first liquid outlet is formed in the light component partition, a second liquid outlet is formed in the medium component partition, and a slag hopper is arranged at the bottom of the heavy component partition; the molten salt step heat treatment unit comprises a first-stage molten salt reactor and a second-stage molten salt reactor, wherein the top of each reactor is provided with a feeding hole, and the side wall of each reactor is provided with a molten salt return hole; the side wall of the first-stage molten salt reactor is provided with a first gas outlet, and the bottom of the first-stage molten salt reactor is provided with a first molten salt separator; a second gas outlet is formed in the side wall of the secondary molten salt reactor, and a second molten salt separator is arranged at the bottom of the secondary molten salt reactor; each molten salt separator is provided with a discharge port; the first gas outlet is communicated with a feed inlet of the secondary molten salt reactor, the first liquid outlet is communicated with a feed inlet of the secondary molten salt reactor, and the second liquid outlet is communicated with a feed inlet of the primary molten salt reactor; the discharge ports of the first molten salt separator and the second molten salt separator are connected with the molten salt regeneration unit, and the regenerated molten salt in the molten salt regeneration unit is reintroduced into the primary molten salt reactor and the secondary molten salt reactor through the molten salt return port respectively; the cascade condensation processing unit comprises a first-stage condenser, a second-stage condenser and a cooling circulation system which is connected with the condensers in series for heat exchange; the top of each condenser is provided with an air inlet, the bottoms of the primary condenser and the secondary condenser are respectively and correspondingly provided with a first gas-liquid separator and a second gas-liquid separator, each gas-liquid separator is respectively provided with a liquid outlet and an air outlet, and the cooling circulating system is provided with a liquid outlet; the second air outlet is communicated with the air inlet of the primary condenser; the gas outlet of the first gas-liquid separator is communicated with the gas inlet of the secondary condenser, and the liquid outlet of the first gas-liquid separator is communicated with the feed liquid recovery unit; a liquid outlet of the second gas-liquid separator is communicated with the cooling circulation system to send the separated liquid-phase product into the cooling circulation system as a circulating working medium, and a gas outlet of the second gas-liquid separator is communicated with the exhaust gas discharged by the tail gas treatment unit; the tail gas processing unit is provided with the liquid outlet, feed liquid recovery unit with cooling circulation system's liquid outlet with tail gas processing unit's liquid outlet communicates respectively.

Preferably, a check valve is arranged in a pipeline of the first liquid outlet communicated with the feed inlet of the secondary molten salt reactor.

Preferably, the tar classification unit further comprises a heater, and the heater is arranged in a pipeline communicating the second liquid outlet with the feed inlet of the first-stage molten salt reactor.

Preferably, the natural settling tank is provided with a liquid distributor for conveying solid waste pyrolysis liquid phase product raw materials at a feed inlet of the natural settling tank, and the top of the natural settling tank is provided with an ultrasonic distance meter for controlling the addition amount of the raw materials.

Preferably, the primary molten salt reactor is provided with a first atomizer at an air inlet thereof, and a first ultrasonic distance meter at the top thereof; and the second-stage molten salt reactor is provided with a second atomizer at the air inlet and a second ultrasonic distance meter at the top.

Preferably, the side wall of the primary molten salt reactor is provided with a first overpressure valve, and the 1/3 height of the primary molten salt reactor is provided with a first temperature measuring instrument of a temperature monitor; and the side wall of the secondary molten salt reactor is provided with a second overpressure valve, and the 1/3 height of the secondary molten salt reactor is provided with a second temperature measuring instrument of a temperature monitor.

Preferably, the cooling circulation system comprises a compressor, a gas cooler, a condenser and a three-phase separator which are connected in series in sequence, wherein: and the gas-phase product separated by the three-phase separator enters the cooling circulation system, and the separated liquid-phase product is discharged from a liquid outlet of the cooling circulation system.

Preferably, the molten salt regeneration unit comprises a first molten salt storage bin and a first molten salt mixer connected above the first molten salt storage bin, and an outlet of the first molten salt storage bin is communicated with a molten salt return port of the primary molten salt reactor through a pump; the molten salt mixer is characterized by further comprising a second molten salt storage bin and a second molten salt mixer connected above the second molten salt storage bin, and an outlet of the second molten salt storage bin is communicated with a molten salt return port of the second-stage molten salt reactor through a pump.

Preferably, the feed liquid recovery unit includes first liquid storage pot and second liquid storage pot, first liquid storage pot with the liquid outlet intercommunication of first gas-liquid separator, the second liquid storage pot intercommunication cooling circulation system's liquid outlet with tail gas processing unit's liquid outlet.

Preferably, the tail gas treatment unit comprises a cyclone separator, a fan and a gas dryer, and an air outlet of the second gas-liquid separator is communicated with an inlet of the cyclone separator; the gas separated by the cyclone separator is introduced into the gas drier through the fan, and the gas is discharged from the gas drier; and liquid separated by the cyclone separator is sent into the feed liquid recovery unit through a liquid outlet of the tail gas treatment unit.

According to the technical scheme of the embodiment of the invention, the solid waste pyrolysis liquid phase product is subjected to sedimentation and grading treatment and then is sent to the secondary molten salt reactor for step heat treatment, and the generated molten slag is further regenerated and then returns to the molten salt reactor; the reaction product enters a two-stage condenser to realize gas-liquid separation, a second-stage liquid-phase product is reused as a working medium to enter a cooling circulation system to be used for cooling the first-stage condenser, the separated liquid enters a liquid storage tank after circulation, and the generated gas is further treated and reused by tail gas, and the device has the following beneficial effects:

1. the density of the solid waste pyrolysis liquid phase product is partitioned, and impurity removal and quality improvement are carried out under the molten salt step heat treatment, so that the classification and conversion of medium-quality components and light-weight components are realized, and the high energy consumption of repeated treatment is avoided;

2. the step separation of the conversion product of the solid waste pyrolysis liquid phase product, and the reclassification and collection of the impurity removal and quality improvement product are carried out, so that the component mixing is avoided;

3. the products of the low-temperature-region step condensation are used as cooling working media to carry out the step condensation of the high-temperature region, and the recycling efficiency of substances and energy is high.

Drawings

FIG. 1 is a system diagram of a solid waste pyrolysis liquid phase product molten salt step treatment impurity removal and quality improvement device provided by an embodiment of the invention;

FIG. 2 is a flow chart of solid waste pyrolysis liquid phase product treatment by adopting the solid waste pyrolysis liquid phase product molten salt step treatment impurity removal upgrading device shown in FIG. 1.

[ main component symbol description ]

1-a tar fractionation unit; 11-natural settling tank; 111-liquid distributor; 112-a first liquid outlet; 113-a second outlet; 114-a slag hopper; 115-ultrasonic rangefinder; 12-a heater;

2-molten salt step heat treatment unit; 21-first order molten salt reactor; 211-a first atomizer; 212-first outlet port; 213-a first molten salt separator; 214-a first thermometer; 215-a first ultrasonic rangefinder; 216-a first overpressure valve; 22-a secondary molten salt reactor; 221-a second atomizer; 222-a second air outlet; 223-a second molten salt separator; 224-a second thermometer; 225-a second ultrasonic rangefinder; 226-a second overpressure valve;

3-a cascade condensation processing unit; 31-a primary condenser; 311-a first gas-liquid separator; 32-a secondary condenser; 322-a second gas-liquid separator; 33-a compressor; 34-a gas cooler; 35-a condenser; 36-a three-phase separator;

4-a molten salt regeneration unit; 411-first molten salt storage; 412-a first molten salt mixer; 421-a second molten salt storage; 422-a second molten salt mixer;

5-a feed liquid recovery unit; 51-a first reservoir; 52-a second reservoir;

6-a tail gas treatment unit; 61-a cyclone separator; 62-a fan; 63-gas dryer.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Aiming at the existing problems, the invention provides the solid waste pyrolysis liquid phase product molten salt gradient treatment impurity removal and quality improvement device, which can reduce the energy consumption of solid waste pyrolysis liquid phase product impurity removal and quality improvement treatment, improve the recycling efficiency of substances and energy, and better realize the comprehensive treatment and resource utilization of the solid waste pyrolysis liquid phase product.

In order to achieve the above technical solution, components of the device for removing impurities and upgrading by molten salt step treatment of solid waste pyrolysis liquid phase products provided by the embodiment of the invention are shown in fig. 1, and the device comprises a tar grading unit 1, a molten salt step heat treatment unit 2, a step condensation treatment unit 3, a molten salt regeneration unit 4, a feed liquid recovery unit 5 and a tail gas treatment unit 6, wherein:

the tar classifying unit 1 includes a natural settling tank 11 and a heater 12. The top of the natural settling tank 11 is provided with a feeding hole, the tank body is divided into a light component area, a medium component area and a heavy component area from top to bottom according to the density gradient distribution of solid waste pyrolysis liquid phase product raw materials, the light component area is provided with a first liquid outlet 112 for discharging light components, the medium component area is provided with a second liquid outlet 113 for discharging medium components, and the bottom of the heavy component area is provided with a slag hopper 114 for discharging heavy components. The natural settling tank 11 is provided with a liquid distributor 111 at the feed inlet thereof for conveying the solid waste pyrolysis liquid phase product raw material, and an ultrasonic distance meter 115 at the top thereof for controlling the addition amount of the solid waste pyrolysis liquid phase product raw material.

The molten salt step heat treatment unit 2 comprises a first-stage molten salt reactor 21 and a second-stage molten salt reactor 22, wherein the top of each reactor is provided with a feeding hole, and the side wall of each reactor is provided with a molten salt returning hole. The side wall of the primary molten salt reactor 21 is provided with a first air outlet 212, the air inlet of the primary molten salt reactor is provided with a first atomizer 211, the top of the primary molten salt reactor is provided with a first ultrasonic distance meter 215, the side wall of the primary molten salt reactor is provided with a first overpressure valve 216, the height of a cylinder 1/3 of the primary molten salt reactor is provided with a first temperature measuring instrument 214 of a temperature monitor, and the bottom of the primary molten salt reactor is provided with a first molten salt separator 213; similarly, the side wall of the secondary molten salt reactor 22 is provided with a second air outlet 222, the air inlet is provided with a second atomizer 221, the top of the secondary molten salt reactor is provided with a first ultrasonic distance meter 225, the side wall of the secondary molten salt reactor is provided with a second overpressure valve 226, the height of a cylinder 1/3 of the secondary molten salt reactor is provided with a second temperature measuring instrument 224 of a temperature monitor, and the bottom of the secondary molten salt reactor is provided with a second molten salt separator 223.

The cascade condensation processing unit 3 comprises a first-stage condenser 31, a second-stage condenser 32 and a cooling circulation system which is connected with the condensers in series for heat exchange. The top of each condenser is provided with an air inlet, the bottoms of the first-stage condenser 31 and the second-stage condenser 32 are respectively and correspondingly provided with a first gas-liquid separator 311 and a second gas-liquid separator 322, and each gas-liquid separator is provided with a liquid outlet and an air outlet. The cooling circulation system comprises a compressor 33, a gas cooler 34, a condenser 35 and a three-phase separator 36 which are sequentially connected in series, wherein a gas-phase product separated by the three-phase separator 36 enters the cooling circulation system, and a separated liquid-phase product is discharged from a liquid outlet of the cooling circulation system. The air outlet of the first gas-liquid separator 311 is communicated with the air inlet of the secondary condenser 32; the liquid outlet of the second gas-liquid separator 322 is communicated with the cooling circulation system to send the separated liquid phase product into the cooling circulation system as the circulating working medium.

The molten salt regeneration unit 4 includes a first molten salt silo 411 and a first molten salt mixer 412 connected thereabove, and a second molten salt silo 421 and a second molten salt mixer 422 connected thereabove. The feed liquid recovery unit 5 includes a first reservoir tank 51 and a second reservoir tank 52. The tail gas treatment unit 6 comprises a cyclone separator 61, a fan 62 and a gas drier 63, wherein the gas separated by the cyclone separator 61 is introduced into the gas drier 63 through the fan 62, and the gas is discharged from the gas drier 63.

As shown in fig. 1, as a specific implementation manner of the solid waste pyrolysis liquid phase product molten salt step treatment impurity removal and quality improvement device:

the first liquid outlet 112 of the tar grading unit 1 is communicated with the feed inlet of the secondary molten salt reactor 22, the check valve is arranged in the communicated pipeline, the second liquid outlet 113 is communicated with the feed inlet of the primary molten salt reactor 21, and the heater 12 is arranged in the communicated pipeline.

Fused salt regeneration unit 4 is connected to the discharge gate of first fused salt separator 213 and second fused salt separator 223, and the export of first fused salt warehouse 411 passes through the fused salt feed back of pump intercommunication one-level fused salt reactor 21, and the export of second fused salt warehouse 421 passes through the fused salt feed back of pump intercommunication second grade fused salt reactor 22, and the fused salt after regeneration in fused salt regeneration unit 4 passes through fused salt feed back respectively and reintroduces reuse in one-level fused salt reactor 21 and the second grade fused salt reactor 22. The first gas outlet 212 of the first molten salt separator 213 is communicated with the feed inlet of the secondary molten salt reactor 22, and the second gas outlet 222 of the second molten salt separator 223 is communicated with the gas inlet of the primary condenser 31.

A liquid outlet of the first gas-liquid separator 311 of the primary condenser 31 is communicated with the first liquid storage tank 51 of the feed liquid recovery unit 5, and a gas outlet of the second gas-liquid separator 322 of the secondary condenser 32 is communicated with the exhaust gas discharged by the tail gas treatment unit 6;

the tail gas treatment unit 6 is provided with a liquid outlet, the second liquid storage tank 52 of the material liquid recovery unit 5 is respectively communicated with the liquid outlet of the cooling circulation system and the liquid outlet of the tail gas treatment unit 6, and the liquid separated by the cyclone separator 61 is sent into the second liquid storage tank 52 through the liquid outlet of the tail gas treatment unit 6.

The implementation as shown in fig. 2 is as follows:

s1, tar grading: solid waste pyrolysis liquid phase product raw materials enter a natural settling tank 11 through a liquid distributor 111 for settling and grading to realize light, medium and heavy components with density gradient distribution, the addition amount of the raw materials is controlled through an ultrasonic range finder 115, and the raw materials at all levels of grading enter different molten salt reactors in a grading manner;

s2, molten salt gradient heat treatment: the medium components are heated and atomized by a heater 12 and enter a first-stage molten salt reactor 21, the temperature is raised to a target temperature for high-temperature heat treatment, the light components are controlled by a check valve and mixed with first-stage reaction volatile components and atomized and enter a second-stage molten salt reactor 22, the temperature is raised to the target temperature for low-temperature heat treatment, first-stage reaction slag is discharged by a first molten salt separator 213, second-stage reaction slag is discharged by a second molten salt separator 223, first-stage and second-stage reaction gas-liquid interfaces are respectively controlled by a first ultrasonic range finder 215 and a first ultrasonic range finder 225, the first-stage molten salt reactor 21 is safely protected by a first overpressure valve 216 and a first temperature detector 214, the second-stage molten salt reactor 22 is safely protected by a second overpressure valve 226 and a second temperature detector 224, and reaction volatile substances enter a step condensation treatment unit 3 for subsequent treatment;

s3, step condensation treatment: the volatile products after the gradient molten salt heat treatment sequentially enter a first-stage condenser 31 and a second-stage condenser 32, the second-stage condenser 32 generates liquid-phase products through a second gas-liquid separator 322 to further serve as cooling working media to participate in heat exchange of the first-stage condenser 31, the liquid-phase products pass through a compressor 33, a gas cooler 34, a condenser 35 and a three-phase separator 36 to enter a second liquid storage tank 52, and the generated gas is subjected to tail gas treatment;

s4, molten salt regeneration: slag generated by the primary molten salt reactor 21 enters a first molten salt mixer 412, and appropriate raw materials are added through a first molten salt storage bin 411 for regeneration, and then the slag is led back to the primary molten salt reactor 21 by a pump; similarly, the slag generated by the secondary molten salt reactor 22 enters the second molten salt mixer 422, and is regenerated by adding appropriate raw materials through the second molten salt storage bin 421, and then is introduced back to the secondary molten salt reactor 22 by a pump;

s5, feed liquid recovery: the liquid phase product separated by the first gas-liquid separator 311 of the first-stage condenser 31 enters a first liquid storage tank 51 for collection, and the liquid phase product separated by the three-phase separator 36 in the cooling circulation system and the cyclone separator 61 in the tail gas treatment unit 6 enters a second liquid storage tank 52 for collection;

s6, tail gas treatment: the gas after the cascade condensation is led out by a fan 62 through a cyclone separator 61, and finally is dried by a gas drier 63 for reuse.

In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the present invention; the terms "connected," "connected," and "communicating," unless expressly specified or limited otherwise, are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; furthermore, the terms "first," "second," "primary," "secondary," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.