Melting furnace for deeply removing organic matters in waste salt and use method of melting furnace

Abstract

The invention provides a melting furnace for deeply removing organic matter in waste salt and a using method thereof.The melting furnace comprises a turbulent burner and a melting furnace body, a fuel gas channel, a combustion-supporting air channel and a feeding air channel are formed in the turbulent burner, the fuel gas channel is communicated with fuel gas supply equipment through a pipeline, the combustion-supporting air channel wraps the fuel gas channel, and the feeding air channel is communicated with the combustion-supporting air channel. The cyclone burner is arranged in the furnace body and is communicated with the combustion-supporting air blower, the feeding air channel wraps the combustion-supporting air channel and is communicated with the waste salt feeding system through the feeding air blower, the melting furnace body wraps the cyclone burner, a group of baffling ribs are arranged on the inner wall of the melting furnace body, and each baffling rib extends in the circumferential direction of the melting furnace body. According to the melting furnace, the problems of incomplete removal of organic matters, non-uniform heating, flue blockage and molten salt discharging in the waste salt melting treatment process can be effectively solved, so that the purpose of efficiently and quickly removing TOC in waste salt can be achieved.

Description

Technical Field

[0001] The invention relates to a melting furnace for deeply removing organic matter from waste salt and a use method thereof. Background Art

[0002] Waste salt is a by-product of crystalline salts produced in industrial production. Its main sources include by-products of chemical production and water treatment processes such as pure water preparation, chemical preparation, and high-salt wastewater treatment. Waste salt contains complex organic impurities and may contain heavy metals and highly toxic impurities, which can cause great harm to the human body. If it is randomly piled or landfilled, it is easy to cause soil and water pollution and damage the ecological environment.

[0003] Waste salt disposal generally requires reducing organic impurities to a certain concentration, and then removing inorganic impurities through ion exchange and other methods. Currently, organic impurity removal mainly includes wet oxidation, anaerobic pyrolysis and other methods. However, due to the complex composition and large differences in properties of waste salt, the wet oxidation method cannot meet the requirements for the TOC concentration of the product salt after disposal. The pyrolysis method has problems such as coking in the furnace and incomplete removal of organic matter for mixed salts with low melting points.

[0004] Patent document CN1113657171A discloses a melting furnace for treating salt-containing solid waste, which first pyrolyzes the salt-containing solid waste, and burns the generated pyrolysis gas and the salt-containing solid waste after pyrolysis to provide heat for pyrolysis. Its disadvantage is that there is no slag discharge system and it can only be unloaded manually. The salt-containing solid waste will melt after combustion and will agglomerate after cooling, which is difficult to remove.

[0005] Patent document CN112503538A discloses a top-jet waste salt melting furnace, in which a mixture of oxygen and fuel gas is introduced into the furnace from the top of the furnace body, thereby achieving sufficient combustion and increasing the temperature in the furnace. The waste salt in the melting furnace is directly fed through a feed hopper, and the waste salt is heated unevenly, and organic matter cannot be completely removed. In addition, the molten salt discharge port is located in the middle section of the furnace body, which causes certain obstacles to the discharge of the waste salt. Summary of the invention

[0006] The object of the present invention is to provide a melting furnace for deeply removing organic matter from waste salt and a method of using the same.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] A melting furnace for deep removal of organic matter from waste salt, comprising:

[0009] A swirl burner, the end of which has a combustion nozzle, can form a swirl combustion flue gas at the combustion nozzle, wherein:

[0010] A gas channel is provided in the swirl burner, and the gas channel is connected to a gas supply device through a pipeline, and the gas supply device supplies combustible gas into the gas channel and sprays it out from the combustion nozzle;

[0011] The swirl burner is also provided with a combustion-supporting air channel, which is covered on the outside of the gas channel and connected to the combustion-supporting blower. The combustion-supporting blower delivers the combustion-supporting air into the combustion-supporting air channel and sprays it out from the combustion nozzle, so that the combustible gas is mixed with the combustion-supporting air at the combustion nozzle to form a swirl combustion flue gas.

[0012] A feed air channel is provided in the swirl burner, which is covered on the outside of the combustion-supporting air channel and is connected to the waste salt feeding system through a feed blower. The feed blower feeds the waste salt particles in the waste salt feeding system into the feed air channel along with the air and sprays them out from the combustion nozzle.

[0013] The melting furnace body is covered on the outside of the swirl burner. The swirl combustion flame can heat the inside of the melting furnace body to make its temperature higher than the melting temperature of the waste salt, and make the waste salt particles sprayed from the feeding air channel change from solid to liquid and then adhere to the inner wall of the melting furnace body and flow downward along the wall, wherein:

[0014] The inner wall of the melting furnace body is provided with a baffle ridge, and the baffle ridge is provided with a group, each baffle ridge extends along the circumference of the melting furnace body, and is arranged in sequence along the axial direction of the melting furnace body. The baffle ridges extend the flow path of the liquid waste salt, so that it is fully in contact with the swirling combustion flue gas, and the organic matter carried in the liquid waste salt is deeply removed;

[0015] A furnace necking is provided at the bottom of the melting furnace body, which is located below the deflection ridge and has a diameter smaller than that of the upper portion of the melting furnace body, so that the liquid waste salt on the inner wall of the melting furnace body is collected at the furnace necking and then drips.

[0016] In one embodiment of the present invention, a combustion-supporting swirl blade is provided at the end of the combustion-supporting air channel, and the combustion-supporting swirl blade drives the combustion-supporting air to form a swirl;

[0017] A feeding swirl blade is provided at the end of the feeding air channel, and the feeding swirl blade drives the air and the waste salt particles it carries to form a swirl;

[0018] The combustion-supporting swirl blades and the feeding swirl blades rotate in the same direction, so that the swirl formed by the combustion-supporting air and the swirl formed by the waste salt particles are superimposed and enhanced.

[0019] In one embodiment of the present invention, the inner wall of the melting furnace body is made of refractory materials, which are mullite lightweight castable, high-alumina lightweight bricks, fiber linings and corundum mullite bricks from outside to inside.

[0020] In one embodiment of the present invention, a smoke outlet is opened on the side of the melting furnace body, and the smoke outlet is located below the furnace necking. The smoke inside the melting furnace body can be discharged from the smoke outlet and treated by the smoke treatment system before being discharged.

[0021] In one embodiment of the present invention, an anti-blocking device is provided in the smoke outlet, which has a thermocouple, a differential pressure transmitter and a ceramic electric heating rod. The temperature in the smoke outlet can be sensed by the thermocouple, the pressure difference before and after the smoke outlet can be sensed by the differential pressure transmitter, and the smoke outlet can be heated by the ceramic electric heating rod to prevent the liquid waste salt carried by the smoke from condensing and clogging in the smoke outlet.

[0022] In one embodiment of the present invention, the melting furnace further comprises:

[0023] The chain plate conveyor is located below the melting furnace body. The liquid waste salt dripping from the furnace necking falls onto the chain plate conveyor and cools to form solid waste salt, which is carried by the chain plate conveyor.

[0024] A buffer tank, which is located below the chain conveyor and is engaged with its outlet end, so that the solid waste salt on the chain conveyor falls into the buffer tank;

[0025] The scraper is located below the chain conveyor, at the top of the buffer tank, and abuts against the lower surface of the chain of the chain conveyor. The scraper scrapes off the solid waste salt carried by the chain conveyor.

[0026] In one embodiment of the present invention, the melting furnace further comprises:

[0027] The furnace body water-cooling jacket is installed at the bottom of the melting furnace body and is located between the chain conveyor and the furnace necking. The furnace body water-cooling jacket cools the liquid waste salt dripping after being collected at the furnace necking.

[0028] In one embodiment of the present invention, the melting furnace further comprises:

[0029] A scraper conveyor is located below the buffer tank and is connected to the bottom of the buffer tank. The scraper conveyor drives the solid waste salt in the buffer tank to be transported outwards;

[0030] A conveying water cooling jacket is coated on the outside of the scraper conveyor to cool the solid waste salt carried by the scraper conveyor.

[0031] The method for using the above-mentioned melting furnace for deep removal of organic matter from waste salt comprises:

[0032] The waste salt is conveyed to the feeding air channel through the waste salt feeding system, and is ejected from the combustion nozzle through the feeding blower, and at the same time, the combustible gas is supplied to the gas channel through the gas supply device and ejected from the combustion nozzle, and the combustion air is conveyed into the combustion air channel through the combustion blower and ejected from the combustion nozzle, so that the combustible gas is mixed with the combustion air at the combustion nozzle to form a swirling combustion flue gas;

[0033] The swirl combustion flame heats the inside of the melting furnace to make its temperature higher than the melting temperature of the waste salt, and the waste salt particles ejected from the feeding air channel are changed from solid to liquid and attached to the inner wall of the melting furnace to form a liquid film, which flows downward along the wall and forms a membrane two-phase flow with the high-temperature flue gas. In this process, the liquid waste salt undergoes intense heat and mass transfer with the high-temperature flue gas, so that the organic matter on its surface and inside is completely burned;

[0034] When the liquid film flows downward along the wall, the deflection ridges extend the flow path and time of the liquid waste salt, so that it can fully contact with the swirl combustion flue gas, and the organic matter carried in the liquid waste salt can be deeply removed;

[0035] The liquid waste salt flows through the baffle ridges and then enters the furnace neck, where it gathers in the center and drips, thus preventing the temperature of the lower wall of the furnace from decreasing and causing the liquid waste salt to condense.

[0036] The flue gas inside the melting furnace body is discharged from the flue gas outlet and treated by the flue gas treatment system before being discharged. During the flue gas discharge process, the temperature in the flue gas outlet is sensed by a thermocouple, the pressure difference before and after the flue gas outlet is sensed by a differential pressure transmitter, and the flue gas outlet is heated by a ceramic electric heating rod to prevent the liquid waste salt carried by the flue gas from condensing and clogging in the flue gas outlet.

[0037] The liquid waste salt dripping from the furnace neck is cooled by the furnace water-cooling jacket, and falls onto the chain conveyor and is cooled to form solid waste salt, which is carried by the chain conveyor and falls into the buffer tank. During the movement, the solid waste salt carried by the chain conveyor is scraped off by a scraper;

[0038] The valve at the bottom of the buffer tank is always open, and the solid waste salt inside it falls onto the scraper conveyor, which carries the solid waste salt outward.

[0039] The advantages of the present invention are:

[0040] The melting furnace can effectively solve the problems of incomplete removal of organic matter, uneven heating, flue blockage and molten salt discharge during the waste salt melting process, thereby achieving the purpose of efficient and rapid removal of TOC in waste salt:

[0041] 1) The swirl burner can evenly deliver the waste salt particles to the furnace by pneumatic conveying by setting different channels, eccentric pipe settings and swirl blades, while ensuring stable combustion of the burner and forming a swirl flow field in the furnace;

[0042] 2) Through centrifugal action, a molten liquid film is formed in the furnace. The thickness of the liquid film is less than 5mm and the residence time is greater than 1 minute. It can effectively enhance the heat and mass transfer between the waste salt and the high-temperature flue gas, so that organic matter can be deeply removed and the TOC concentration can be reduced to below 10ppm;

[0043] 3) The flue anti-blocking device can effectively solve the common blockage problem in the waste salt melting process. According to different types of waste salt, the temperature or pressure difference control device can be selected to start and stop, ensuring that the device can operate stably when processing various types of waste salt;

[0044] 4) The discharging system collects the molten salt droplets after condensation, and can discharge continuously. The discharging particles are small rather than large pieces of condensed salt, which is convenient for transportation and subsequent processing;

[0045] 5) The TOC concentration of the salt produced by this system can be stably maintained below 10ppm, meeting the salt standards for ion membranes in the chlor-alkali industry. The product can be used in the chlor-alkali industry to realize resource utilization of waste salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the structure of a melting furnace for deep removal of organic matter from waste salt proposed by the present invention;

[0047] Figure 2 It is a schematic diagram of the cross-sectional structure of a swirl burner;

[0048] Figure 3 It is a schematic diagram of the end face structure of a swirl burner. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0050] like Figure 1 to Figure 3As shown, the melting furnace for deep removal of organic matter from waste salt proposed by the present invention comprises a swirl burner 100 and a melting furnace body 200;

[0051] A combustion nozzle 101 is provided at the end of the swirl burner, which can form a swirl combustion flue gas at the combustion nozzle. A gas channel 110 is provided in the swirl burner, and the gas channel is connected to a gas supply device through a pipeline. The gas supply device supplies combustible gas to the gas channel and sprays it out from the combustion nozzle. A combustion-supporting air channel 120 is also provided in the swirl burner. The combustion-supporting air channel is coated on the outside of the gas channel and is connected to a combustion-supporting blower. The combustion-supporting air is sent into the combustion-supporting air channel by the combustion-supporting blower and sprayed out from the combustion nozzle, so that the combustible gas is mixed with the combustion-supporting air at the combustion nozzle to form a swirl combustion flue gas. A feeding air channel 130 is provided in the swirl burner. The feeding air channel is coated on the outside of the combustion-supporting air channel and is connected to a waste salt feeding system through a feeding blower. The waste salt particles in the waste salt feeding system are sent into the feeding air channel along with air by the feeding blower, and sprayed out from the combustion nozzle.

[0052] The melting furnace body is coated on the outside of the swirl burner, and the swirl combustion flame can heat the inside of the melting furnace body to make its temperature higher than the melting temperature of the waste salt, and make the waste salt particles sprayed out of the feeding air channel change from solid to liquid and then adhere to the inner wall of the melting furnace body and flow downward along the wall. The inner wall of the melting furnace body is provided with a deflection rib 210, and the deflection rib is provided with a group, each deflection rib extends along the circumference of the melting furnace body and is arranged sequentially along the axial direction of the melting furnace body. The deflection rib extends the flow path of the liquid waste salt so that it is fully in contact with the swirl combustion flue gas, and the organic matter carried in the liquid waste salt is deeply removed. A furnace necking is provided at the bottom of the melting furnace body, and the furnace necking is located below the deflection rib, and its diameter is smaller than the diameter of the upper part of the melting furnace body, so that the liquid waste salt on the inner wall of the melting furnace body is gathered at the furnace necking and then drips.

[0053] In this embodiment, a combustion-supporting swirl blade is provided at the end of the combustion-supporting air channel, and the combustion-supporting swirl blade drives the combustion air to form a swirl; a feeding swirl blade is provided at the end of the feeding air channel, and the feeding swirl blade drives the air and the waste salt particles it carries to form a swirl; the rotation directions of the combustion-supporting swirl blade and the feeding swirl blade are consistent, so that the swirl formed by the combustion-supporting air and the swirl formed by the waste salt particles are superimposed and enhanced.

[0054] In this embodiment, the inner wall of the melting furnace body is made of refractory materials, which are mullite lightweight castable, high-alumina lightweight bricks, fiber linings and corundum mullite bricks from the outside to the inside.

[0055] In this embodiment, a smoke outlet 220 is provided on the side of the melting furnace body, and the smoke outlet is located below the furnace necking. The smoke inside the melting furnace body can be discharged from the smoke outlet and treated by the smoke treatment system before being discharged.

[0056] In this embodiment, an anti-blocking device is provided in the flue gas outlet, which has a thermocouple, a differential pressure transmitter and a ceramic electric heating rod. The temperature in the flue gas outlet can be sensed by the thermocouple, the pressure difference before and after the flue gas outlet can be sensed by the differential pressure transmitter, and the flue gas outlet can be heated by the ceramic electric heating rod to prevent the liquid waste salt carried by the flue gas from condensing and clogging in the flue gas outlet.

[0057] In this embodiment, the melting furnace further includes a chain plate machine 310, a buffer tank 320 and a scraper 330. The chain plate machine is located below the melting furnace body. The liquid waste salt dripping from the furnace necking falls onto the chain plate machine and cools to form solid waste salt, which is carried by the chain plate machine. The buffer tank is located below the chain plate machine and is engaged with its outlet end, so that the solid waste salt on the chain plate machine falls into the buffer tank. The scraper is located below the chain plate machine, which is located at the top of the buffer tank and abuts against the lower surface of the chain plate of the chain plate machine. The scraper scrapes the solid waste salt carried by the chain plate machine. Among them, a discharge valve 321 is provided at the bottom of the buffer tank, and the solid waste salt accumulated in the buffer tank can be discharged through the discharge valve.

[0058] In this embodiment, the melting furnace also includes a furnace body water-cooling jacket 230, which is installed at the bottom of the melting furnace body and is located between the chain conveyor and the furnace necking. The furnace body water-cooling jacket cools the liquid waste salt dripping after gathering at the furnace necking.

[0059] In this embodiment, the melting furnace also includes a scraper conveyor 410 and a conveying water-cooling jacket 420. The scraper conveyor is located below the buffer tank and is connected to the bottom of the buffer tank. The scraper conveyor drives the solid waste salt in the buffer tank to be transported outward. The conveying water-cooling jacket is covered on the outside of the scraper conveyor to cool the solid waste salt carried by the scraper conveyor.

[0060] The method for using the above-mentioned melting furnace for deep removal of organic matter from waste salt comprises:

[0061] The waste salt is conveyed to the feeding air channel through the waste salt feeding system, and is ejected from the combustion nozzle through the feeding blower, and at the same time, the combustible gas is supplied to the gas channel through the gas supply device and ejected from the combustion nozzle, and the combustion air is conveyed into the combustion air channel through the combustion blower and ejected from the combustion nozzle, so that the combustible gas is mixed with the combustion air at the combustion nozzle to form a swirling combustion flue gas;

[0062] The swirl combustion flame heats the inside of the melting furnace to make its temperature higher than the melting temperature of the waste salt, and the waste salt particles ejected from the feeding air channel are changed from solid to liquid and attached to the inner wall of the melting furnace to form a liquid film, which flows downward along the wall and forms a membrane two-phase flow with the high-temperature flue gas. In this process, the liquid waste salt undergoes intense heat and mass transfer with the high-temperature flue gas, so that the organic matter on its surface and inside is completely burned;

[0063] When the liquid film flows downward along the wall, the deflection ridges extend the flow path and time of the liquid waste salt, so that it can fully contact with the swirl combustion flue gas, and the organic matter carried in the liquid waste salt can be deeply removed;

[0064] The liquid waste salt flows through the baffle ridges and then enters the furnace neck, where it gathers in the center and drips, thus preventing the temperature of the lower wall of the furnace from decreasing and causing the liquid waste salt to condense.

[0065] The flue gas inside the melting furnace body is discharged from the flue gas outlet and treated by the flue gas treatment system before being discharged. During the flue gas discharge process, the temperature in the flue gas outlet is sensed by a thermocouple, the pressure difference before and after the flue gas outlet is sensed by a differential pressure transmitter, and the flue gas outlet is heated by a ceramic electric heating rod to prevent the liquid waste salt carried by the flue gas from condensing and clogging in the flue gas outlet.

[0066] The liquid waste salt dripping from the furnace neck is cooled by the furnace water-cooling jacket, and falls onto the chain conveyor and is cooled to form solid waste salt, which is carried by the chain conveyor and falls into the buffer tank. During the movement, the solid waste salt carried by the chain conveyor is scraped off by a scraper;

[0067] The valve at the bottom of the buffer tank is always open, and the solid waste salt inside it falls onto the scraper conveyor, which carries the solid waste salt outward.

[0068] Embodiment 1:

[0069] The waste salt to be disposed is the by-product salt of glyphosate, the main component of which is sodium chloride (accounting for about 85%), and the rest is organic impurities and other impurities. The TOC concentration is 1000ppm. The particle size of the waste salt after screening is about 0.5mm, and the melting point of this type of waste salt is about 801℃. The waste salt enters the feed air channel in the burner through the feeding system, and the air blown in by the feed blower carries the waste salt particles into the melting furnace. At the same time, another air is introduced into the combustion air channel, and the ratio of the combustion air volume to the feed air volume is 1:1. The fuel is natural gas, which enters the melting furnace through the gas channel in the burner, merges with the two air streams at the nozzle, and produces a strong vortex. The high-temperature flue gas generated by combustion heats the furnace to above 1000℃, and the waste salt absorbs heat and melts at a temperature greater than 1000℃, and adheres to the inner wall of the melting furnace under the centrifugal action of the vortex, forming a 5mm thick liquid film, and flows downward due to gravity. When the molten salt flows through the baffle ribs in the furnace, the travel and residence time will be increased to ensure that the residence time is greater than 1 minute, so that the organic matter in the waste salt is fully burned and deeply removed. After passing through the baffle ribs, the molten salt droplets flow into the constriction, gather and drip to the discharge device. The flue anti-blocking device monitors the temperature in the flue in real time, starts the ceramic electric heating rod when the flue temperature is lower than 801℃, and stops heating when the flue temperature rises to above 850℃, to ensure that the molten salt in the flue gas will not condense in the flue and cause blockage. The flue gas enters the subsequent flue gas treatment system through the flue gas outlet and is discharged after being treated to meet the standards.

[0070] During this process, the chain conveyor keeps running, and the cooling water in the water-cooling jacket is always open to ensure that the temperature of the outer wall of the discharge device is lower than 40°C. The molten salt droplets drip directly onto the chain conveyor, quickly condense into solid salt, and fall into the buffer tank by gravity as the chain moves. The valve at the bottom of the buffer tank is always open, and the product salt falls directly into the scraper conveyor. The cooling water in the water-cooling jacket of the scraper conveyor keeps flowing to cool the product salt to below 60°C. The scraper conveyor discharge port is directly connected to the salt dissolving pool conveying device, and the product salt is directly sent to the downstream process for treatment. The TOC of the treated waste salt is tested to be 5ppm.

[0071] Embodiment 2:

[0072] Disposal of mixed waste salt with sodium chloride and potassium chloride as the main components. The ratio of sodium chloride and potassium chloride in the waste salt is about 1:1, accounting for 90% of the waste salt, and the rest is organic matter and other impurities. The melting point of the waste salt is about 660℃, the TOC concentration is 3000ppm, and the particle size of the waste salt after screening is about 0.5mm. The waste salt enters the feed air channel in the burner 1 through the feeding system, and the air blown in by the blower carries the salt particles into the melting furnace. At the same time, another air is introduced into the combustion air channel, and the ratio of the combustion air volume to the feed air volume is 6:4. Natural gas is used as fuel. The natural gas enters the melting furnace through the gas channel in the burner, merges with the two air streams at the nozzle, and produces a strong vortex. The high-temperature flue gas generated by combustion heats the furnace to above 800℃, and the waste salt absorbs heat and melts at a temperature greater than 800℃, and adheres to the inner wall of the melting furnace under the centrifugal action of the vortex, forming a 5mm thick liquid film, and flows downward due to gravity. When the molten salt flows through the baffle ribs in the furnace, the travel and residence time will be increased to ensure that the residence time is greater than 1 minute, so that the organic matter in the waste salt is fully burned and deeply removed. After passing through the baffle ribs, the molten salt droplets flow into the constriction, gather and drip to the discharge device. The flue anti-blocking device monitors the pressure difference before and after the flue in real time. When the pressure difference before and after the flue is higher than 500pa and continues to rise, the ceramic electric heating rod is started, and the heating is stopped when the pressure difference drops below 100pa to ensure that the molten salt in the flue gas will not condense in the flue and cause blockage. The flue gas enters the subsequent flue gas treatment system through the flue gas outlet and is discharged after the treatment meets the standards.

[0073] During this process, the chain conveyor keeps running, and the cooling water in the water-cooling jacket is always open to ensure that the temperature of the outer wall of the discharge device is lower than 40°C. The molten salt droplets drip directly onto the chain conveyor, quickly condense into solid salt, and fall into the buffer tank by gravity as the chain moves. The valve at the bottom of the buffer tank is always open, and the product salt falls directly into the scraper conveyor. The cooling water in the water-cooling jacket of the scraper conveyor keeps flowing to cool the product salt to below 60°C. The scraper conveyor is connected to the product storage tank at the feeding port, and the storage tank is replaced after it is full. When replacing the storage tank, close the valve first, and the scraper conveyor continues to run for a period of time. At this time, the discharge is temporarily stored in the buffer tank. After replacing the storage tank, open the valve to discharge the product salt temporarily stored in the buffer tank again. The treated waste salt was tested to have a TOC of 10ppm.

[0074] In the description of the present invention, it should be noted that when terms such as "upper", "lower", "inner", "outer", "left", "right" and the like indicating orientation or positional relationship appear, it should be understood that the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the equipment or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, when terms such as "first" and "second" appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "setting", and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A melting furnace for deep removal of organic matter from waste salt, characterized in that: include: A swirl burner having a combustion nozzle at the end thereof, wherein: A gas channel is provided in the swirl burner, and the gas channel is connected to the gas supply equipment through a pipeline; The swirl burner is also provided with a combustion-supporting air channel, which is covered on the outside of the gas channel and connected to the combustion-supporting blower, so that the combustible gas is mixed with the combustion-supporting air at the combustion nozzle to form a swirl combustion flue gas; A feed air channel is provided in the swirl burner, the feed air channel is covered on the outside of the combustion-supporting air channel, and is connected to the waste salt feeding system through a feed blower; A melting furnace body, which is coated on the outside of the swirl burner, wherein: The inner wall of the melting furnace body is provided with a baffle ridge, and the baffle ridge is provided in a group, and each baffle ridge extends along the circumference of the melting furnace body and is arranged in sequence along the axial direction of the melting furnace body; A furnace necking opening is provided at the bottom of the melting furnace body. The furnace necking opening is located below the baffle convex ridge and has a diameter smaller than that of the upper portion of the melting furnace body.

2. A melting furnace for deep removal of organic matter from waste salt according to claim 1, characterized in that: A combustion-supporting swirl blade is provided at the end of the combustion-supporting air channel, and the combustion-supporting swirl blade drives the combustion-supporting air to form a swirl; A feeding swirl blade is provided at the end of the feeding air channel, and the feeding swirl blade drives the air and the waste salt particles it carries to form a swirl; The combustion-supporting swirl blades and the feeding swirl blades rotate in the same direction, so that the swirl formed by the combustion-supporting air and the swirl formed by the waste salt particles are superimposed and enhanced.

3. The melting furnace for deep removal of organic matter from waste salt according to claim 1, characterized in that: The inner wall of the melting furnace is made of refractory materials, which are mullite lightweight castable, high-alumina lightweight bricks, fiber lining and corundum mullite bricks from the outside to the inside.

4. The melting furnace for deep removal of organic matter from waste salt according to claim 1, characterized in that: A smoke outlet is provided on the side of the melting furnace body, and the smoke outlet is located below the furnace necking, and the smoke inside the melting furnace body can be discharged from the smoke outlet.

5. A melting furnace for deep removal of organic matter from waste salt according to claim 4, characterized in that: An anti-blocking device is provided in the flue gas outlet, which has a thermocouple, a differential pressure transmitter and a ceramic electric heating rod. The temperature in the flue gas outlet can be sensed by the thermocouple, the pressure difference before and after the flue gas outlet can be sensed by the differential pressure transmitter, and the flue gas outlet can be heated by the ceramic electric heating rod.

6. A melting furnace for deep removal of organic matter from waste salt according to claim 1, characterized in that: Also includes: The chain plate conveyor is located below the melting furnace body. The liquid waste salt dripping from the furnace necking falls onto the chain plate conveyor and cools to form solid waste salt, which is carried by the chain plate conveyor. A buffer tank, which is located below the chain conveyor and is engaged with its outlet end, so that the solid waste salt on the chain conveyor falls into the buffer tank; The scraper is located below the chain conveyor, is located on the top of the buffer tank, and abuts against the lower surface of the chain of the chain conveyor.

7. A melting furnace for deep removal of organic matter from waste salt according to claim 6, characterized in that: Also includes: The furnace body water-cooling jacket is installed at the bottom of the melting furnace body and is located between the chain conveyor and the furnace necking. The furnace body water-cooling jacket cools the liquid waste salt dripping after being collected at the furnace necking.

8. The melting furnace for deep removal of organic matter from waste salt according to claim 6, characterized in that: Also includes: A scraper conveyor is located below the buffer tank and is connected to the bottom of the buffer tank. The scraper conveyor drives the solid waste salt in the buffer tank to be transported outwards; A conveying water cooling jacket is coated on the outside of the scraper conveyor to cool the solid waste salt carried by the scraper conveyor.

9. A method for using a melting furnace for deep removal of organic matter from waste salt, operating the melting furnace according to any one of claims 1 to 8, characterized in that: include: The waste salt is conveyed to the feeding air channel through the waste salt feeding system, and is ejected from the combustion nozzle through the feeding blower, and at the same time, the combustible gas is supplied to the gas channel through the gas supply device and ejected from the combustion nozzle, and the combustion air is conveyed into the combustion air channel through the combustion blower and ejected from the combustion nozzle, so that the combustible gas is mixed with the combustion air at the combustion nozzle to form a swirling combustion flue gas; The swirl combustion flame heats the inside of the melting furnace to make its temperature higher than the melting temperature of the waste salt, and the waste salt particles ejected from the feeding air channel are changed from solid to liquid and attached to the inner wall of the melting furnace to form a liquid film, which flows downward along the wall and forms a membrane two-phase flow with the high-temperature flue gas. In this process, the liquid waste salt undergoes intense heat and mass transfer with the high-temperature flue gas, so that the organic matter on its surface and inside is completely burned; When the liquid film flows downward along the wall, the deflection ridges extend the flow path and time of the liquid waste salt, so that it can fully contact with the swirl combustion flue gas, and the organic matter carried in the liquid waste salt can be deeply removed; The liquid waste salt flows through the baffle ridges and then enters the furnace neck, where it gathers in the center and drips, thus preventing the temperature of the lower wall of the furnace from decreasing and causing the liquid waste salt to condense. The flue gas inside the melting furnace body is discharged from the flue gas outlet and treated by the flue gas treatment system before being discharged. During the flue gas discharge process, the temperature in the flue gas outlet is sensed by a thermocouple, the pressure difference before and after the flue gas outlet is sensed by a differential pressure transmitter, and the flue gas outlet is heated by a ceramic electric heating rod to prevent the liquid waste salt carried by the flue gas from condensing and clogging in the flue gas outlet. The liquid waste salt dripping from the furnace neck is cooled by the furnace water-cooling jacket, and falls onto the chain conveyor and is cooled to form solid waste salt, which is carried by the chain conveyor and falls into the buffer tank. During the movement, the solid waste salt carried by the chain conveyor is scraped off by a scraper; The valve at the bottom of the buffer tank is always open, and the solid waste salt inside it falls onto the scraper conveyor, which carries the solid waste salt outward.

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