Equipment applied to anaerobic pyrolysis treatment of industrial waste salt and use method

Abstract

The invention discloses equipment applied to anaerobic pyrolysis treatment of industrial waste salt and a using method of the equipment, relates to the technical field of industrial waste salt treatment, and particularly relates to an industrial waste salt treatment device capable of continuously, stably and efficiently operating for anaerobic pyrolysis of waste salt and a using method of the industrial waste salt treatment device. The device is characterized in that a waste salt pyrolyzing furnace is fixedly arranged in the anaerobic heat preservation box, a shield-shaped spiral pusher is arranged in the waste salt pyrolyzing furnace, and one end of the shield-shaped spiral pusher is connected with a pushing driver located outside the anaerobic heat preservation box; one end of the waste salt pyrolyzing furnace is provided with a waste salt feeding pipe upwards extending out of the anaerobic heat preservation box, and the lower part of the other end of the waste salt pyrolyzing furnace is provided with a discharging device; the waste salt pyrolyzing furnace and the secondary combustion chamber are arranged in the anaerobic heat preservation box, it is guaranteed that the pyrolysis process is in an anaerobic state, inert gas protection is not needed, and safe operation of the waste salt pyrolyzing furnace and the full-carbonization requirement of organic matter are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial waste salt treatment, and in particular to an industrial waste salt treatment device capable of continuous, stable and efficient operation of anaerobic pyrolysis of waste salt and a method for using the same. Background Art

[0002] Currently, the equipment used for the thermal decomposition of industrial waste salt includes high-temperature melting equipment, rotary kiln equipment, and microwave pyrolysis equipment. During high-temperature melting, the industrial waste salt is fully heated until it completely melts into a liquid state. The temperature is typically determined based on the composition of the waste salt (usually no less than 800°C). Under this condition, the organic matter in the waste salt is completely decomposed or oxidized. The molten salt is then cooled to below 95°C by circulating water and sent to the back-end for resource recovery. Rotary kiln pyrolysis generally has two stages: the first stage removes moisture from the waste salt, while the second stage completely removes, decomposes, and oxidizes the organic matter in the waste salt at a relatively low, non-melting state, achieving the purpose of refining. Microwave pyrolysis technology utilizes the waste salt's own electric field energy loss to generate heat, and then uses the heat (temperature adjustable) generated by the waste salt after receiving microwave radiation to pyrolyze the organic matter.

[0003] The above equipment can basically meet the function of removing TOC when the composition of waste salt is relatively stable. However, analysis of the source of industrial waste salt shows that fluctuations in waste salt are normal, and compared with pure salt, the difference in eutectic temperature of waste salt is greatly affected by changes in waste salt composition. Therefore, the above technologies usually face problems such as poor continuous stability (i.e., easy salt scarring and low device online rate), high operating costs (incomplete impurity removal, requiring the installation of a deep impurity removal unit and concentration, which leads to high energy consumption and high costs), and insufficient by-product quality. Therefore, the present invention provides a continuous temperature, low-carbon and high-efficiency industrial waste salt pyrolysis treatment device. Summary of the Invention

[0004] The purpose of the present invention is to provide an industrial waste salt disposal device for anaerobic pyrolysis of waste salt that can operate continuously, stably and efficiently and a method for using the same to solve the problems raised in the above background technology.

[0005] The present invention provides equipment for anaerobic pyrolysis treatment of industrial waste salt, comprising an anaerobic insulation box, the inner walls of which are all provided with an insulation layer, a waste salt pyrolysis furnace fixedly installed in the anaerobic insulation box, a shield-shaped spiral pusher provided in the waste salt pyrolysis furnace, and one end of the shield-shaped spiral pusher connected to a pusher driver located outside the anaerobic insulation box; A waste salt feeding pipe extending upward from the anaerobic insulation box is provided on one end of the waste salt pyrolysis furnace, and a discharging device is provided at the lower part of the other end of the waste salt pyrolysis furnace; A secondary combustion chamber is fixedly arranged in the anaerobic insulation box above the waste salt pyrolysis furnace. The secondary combustion chamber is connected to the waste salt pyrolysis furnace through a pyrolysis gas exhaust pipe. The secondary combustion chamber is also provided with an exhaust gas exhaust pipe extending from the anaerobic insulation box. The exhaust gas exhaust pipe is connected to a pyrolysis flue gas treatment device. The invention also includes a secondary combustion chamber burner arranged outside the anaerobic insulation box, one end of the secondary combustion chamber burner passes through the anaerobic insulation box and extends into the secondary combustion chamber.

[0006] Preferably, the waste salt pyrolysis furnace is a hollow column, and both ends of the waste salt pyrolysis furnace are respectively welded to the inner walls of the two sides corresponding to the anaerobic insulation box; The circumference of the waste salt pyrolysis furnace is surrounded by three cylindrical arc surfaces, two of which are arranged in parallel, and the other arc surface is a third arc surface. The two arc surfaces arranged in parallel are connected on the sides close to each other, and the sides of the two arc surfaces away from each other are connected through the third arc surface. The central axes of the three cylindrical arc surfaces are arranged parallel to each other; The two parallel arc surfaces are both provided with pyrolysis furnace discharge pipes, and the pyrolysis furnace discharge pipes are both connected to the discharge device; A shield-shaped spiral pusher is respectively arranged in the area of ​​the two parallel arc surfaces.

[0007] Preferably, two waste salt feeding pipes are provided on the third arc surface, and the two waste salt feeding pipes are respectively provided corresponding to the areas where the two parallel arc surfaces are located.

[0008] Preferably, the diameters of the circles on which the two parallel arc surfaces lie are equal.

[0009] Preferably, the shield-shaped spiral pusher is a shield-shaped spiral pusher whose size matches the cylindrical arc surface on which it is located.

[0010] Preferably, two waste salt pyrolysis furnaces are provided, the two waste salt pyrolysis furnaces are arranged in parallel with each other, and the two waste salt pyrolysis furnaces are respectively connected to the secondary combustion chamber through pyrolysis gas exhaust pipes.

[0011] Preferably, the discharging device includes a pyrolysis discharging screw conveyor, one end of which is welded to the inner wall of one side of the anaerobic insulation box, and the other end of which passes through the other side of the anaerobic insulation box and is connected to the waste salt discharge port; One end of the pyrolysis discharging screw conveyor away from the waste salt discharging port is sequentially connected to a discharging gearbox and a discharging motor arranged outside the anaerobic insulation box.

[0012] Preferably, the pushing drive comprises a connected pushing motor, and the pushing motor is connected to the shield-shaped spiral pusher through a pushing gearbox.

[0013] Preferably, the end of the waste salt pyrolysis furnace close to one end of the waste salt feeding pipe is further connected to a fault salt discharge port located outside the anaerobic insulation box; The anaerobic insulation box is also provided with an inspection manhole.

[0014] A method of use, which is a method of using equipment for anaerobic pyrolysis treatment of industrial waste salt, comprising the following steps: 1) The fuel gas and the combustion-supporting gas enter the secondary combustion chamber through the secondary combustion chamber burner and ignite the furnace until the temperature inside the waste salt pyrolysis furnace reaches the temperature required for waste salt pyrolysis. The temperature can be adjusted according to the eutectic point of the raw materials, generally not less than 650 degrees, and the temperature difference inside the waste salt pyrolysis furnace is not more than 25 degrees; 2) The discharge motor is powered on and started, driving the discharge gearbox and the pyrolysis discharge screw conveyor to operate, controlling the residence time of the waste salt in the waste salt pyrolysis furnace to be 30 to 90 minutes. Since the waste gas discharge pipe is connected to the pyrolysis flue gas treatment device, and the pyrolysis flue gas treatment device is connected to the induced draft fan, the waste salt pyrolysis furnace is slightly negatively pressurized, ensuring that the oxygen concentration in the waste salt pyrolysis furnace is no more than 0.2%; 3) The pyrolysis gas generated during the pyrolysis of waste salt is sucked into the secondary combustion chamber and burned by the flame at the end of the burner in the secondary combustion chamber to produce exhaust gas. The pyrolysis gas stays in the secondary combustion chamber for no less than 2 seconds to fully burn and ensure that the combustible components in the pyrolysis gas are completely oxidized; 4) The pyrolysis waste salt produced by the waste salt pyrolysis furnace is discharged out of the equipment through the discharging device; 5) When the equipment is shut down due to an accident or regularly shut down for maintenance, the waste salt remaining in the pyrolysis furnace can be discharged from the faulty salt discharge port by reversing the pyrolysis discharge screw conveyor; or the anaerobic insulation box can be entered through the maintenance manhole for inspection and maintenance.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention places the waste salt pyrolysis furnace and the secondary combustion chamber in an anaerobic insulation box to ensure that the pyrolysis process is in an anaerobic state without the need for inert gas protection, thereby ensuring the safe operation of the waste salt pyrolysis furnace and the full carbonization requirements of organic matter.

[0016] (2) The spiral pusher used in the waste salt pyrolysis furnace is a shield-shaped spiral pusher whose size matches the cylindrical arc surface. It ensures that the material is heated evenly, reduces turbulence, reduces dust production, and ensures the continuous, stable and efficient operation of the device. The online rate of the device can reach more than 95% throughout the year.

[0017] (3) The present invention combines direct combustion, radiation heating and disturbance heating together, fully utilizing the heat while also fully ensuring the uniformity of heating in the waste salt pyrolysis furnace. The heating temperature difference is no more than 25 degrees, which completely solves the problem of coking or salt adhesion caused by uneven heating, and further ensures the continuous and reliable operation of the present invention.

[0018] (4) The present invention divides the dynamic (combustion, pyrolysis and transportation) and static (heating space) into zones, and the static zone adopts a rectangular structure, which is easier to process, select materials, and insulate. The dynamic space is miniaturized, which is more conducive to the selection of dynamic equipment and materials, ultimately making the overall cost of the device lower and easier to manufacture.

[0019] (5) The shield-shaped spiral pusher installed in the waste salt pyrolysis furnace and the relatively high pyrolysis temperature, not less than 650 degrees, enable industrial waste salt to not only remove organic matter through pyrolysis, but also undergo a double decomposition reaction and sintering process of partial melting of impurity cationic compounds and carbonates in this environment, thereby solidifying the impurity metal cations and filtering and removing them in the subsequent dissolution process, greatly reducing the subsequent waste salt resource pretreatment requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a left view of the present invention.

[0022] Figure markings: 1-anaerobic insulation box, 2-insulation layer, 3-secondary combustion chamber, 4-secondary combustion chamber burner, 5-waste salt pyrolysis furnace, 6-shield screw pusher, 7-pushing gearbox, 8-pushing motor, 9-pyrolysis furnace discharge pipe, 10-pyrolysis discharge screw conveyor, 11-discharge gearbox, 12-discharge motor, 13-waste salt feed pipe, 14-waste salt discharge port, 15-waste gas discharge pipe, 16-support, 17-secondary combustion chamber fixer, 18-pyrolysis gas discharge pipe, 19-fault salt discharge port, 20-maintenance manhole. DETAILED DESCRIPTION

[0023] The present invention will be described below with reference to the accompanying drawings: See also Figure 1 The present invention provides an apparatus for anaerobic pyrolysis treatment of industrial waste salt, comprising an anaerobic insulation box 1, the inner wall of which is provided with an insulation layer 2, a waste salt pyrolysis furnace 5 fixedly installed in the anaerobic insulation box 1, a shield-shaped spiral pusher 6 provided in the waste salt pyrolysis furnace 5, and one end of the shield-shaped spiral pusher 6 connected to a pusher driver located outside the anaerobic insulation box 1; A waste salt feeding pipe 13 extending upward from the anaerobic insulation box 1 is provided on one end of the waste salt pyrolysis furnace 5, and a discharge device is provided at the lower part of the other end of the waste salt pyrolysis furnace 5; A secondary combustion chamber 3 is also fixedly arranged in the anaerobic insulation box 1 above the waste salt pyrolysis furnace 5. The secondary combustion chamber 3 is fixedly connected to the anaerobic insulation box 1 through a secondary combustion chamber fixer 17. The secondary combustion chamber 3 is connected to the waste salt pyrolysis furnace 5 through a pyrolysis gas exhaust pipe 18. The secondary combustion chamber 3 is also provided with an exhaust gas exhaust pipe 15 extending out of the anaerobic insulation box 1, and the exhaust gas exhaust pipe 15 is connected to a pyrolysis flue gas treatment device; a support 16 is provided at the bottom of the anaerobic insulation box 1.

[0024] The secondary combustion chamber burner 4 is also included and is arranged outside the anaerobic insulation box 1 . One end of the secondary combustion chamber burner 4 passes through the anaerobic insulation box 1 and extends into the secondary combustion chamber 3 .

[0025] The fuel gas and the combustion-supporting gas enter the secondary combustion chamber 3 through the secondary combustion chamber burner 4 to ignite the furnace. Under the heat-insulating effect of the anaerobic insulation box 1, a heating atmosphere is formed, so that the waste salt pyrolysis furnace 5 in the anaerobic insulation box 1 is heated as a whole, thereby ensuring the uniformity of heating of the waste salt pyrolysis furnace 5, completely solving the problem of coking or salt adhesion caused by uneven heating, and further ensuring the continuous and reliable operation of this equipment.

[0026] In one embodiment, see Figure 2 The waste salt pyrolysis furnace 5 is a hollow column, and both ends of the waste salt pyrolysis furnace 5 are respectively welded to the inner walls of the two sides corresponding to the anaerobic insulation box 1; The circumference of the waste salt pyrolysis furnace 5 is surrounded by three cylindrical arc surfaces, two of which are arranged in parallel, and the other arc surface is a third arc surface. The two arc surfaces arranged in parallel are connected on the sides close to each other, and the sides of the two arc surfaces away from each other are connected through the third arc surface. The central axes of the three cylindrical arc surfaces are arranged parallel to each other; The two parallel arc surfaces are both provided with pyrolysis furnace discharge pipes 9, and the pyrolysis furnace discharge pipes 9 are both connected to the discharge device; A shield-shaped screw pusher 6 is respectively provided in the area of ​​the two parallel arc surfaces.

[0027] In one embodiment, two waste salt feeding pipes 13 are provided on the third arc surface, and the two waste salt feeding pipes 13 are respectively provided corresponding to the areas where the two parallel arc surfaces are located.

[0028] The diameters of the circles containing the two parallel arc surfaces are equal.

[0029] In one embodiment, the shield-shaped spiral pusher 6 is a shield-shaped spiral pusher 6 whose size matches the cylindrical arc surface on which it is located.

[0030] In one embodiment, two waste salt pyrolysis furnaces 5 are provided, and the two waste salt pyrolysis furnaces 5 are arranged in parallel with each other, and the two waste salt pyrolysis furnaces 5 are respectively connected to the secondary combustion chamber 3 through the pyrolysis gas exhaust pipe 18.

[0031] The discharging device includes a pyrolysis discharging screw conveyor 10, one end of which is welded to the inner wall of one side of the anaerobic insulation box 1, and the other end of the pyrolysis discharging screw conveyor 10 passes through the other side of the anaerobic insulation box 1 and is connected to the waste salt discharge port 14; One end of the pyrolysis discharging screw conveyor 10 away from the waste salt discharging port 14 is sequentially connected to a discharging gearbox 11 and a discharging motor 12 arranged outside the anaerobic insulation box 1.

[0032] The pushing drive includes a connected pushing motor 8 , which is connected to a shield-shaped spiral pusher 6 via a pushing gearbox 7 .

[0033] The waste salt pyrolysis furnace 5 is also connected to a fault salt discharge port 19 located outside the anaerobic insulation box 1 at one end of the waste salt feed pipe 13; The anaerobic insulation box 1 is also provided with a maintenance manhole 20 .

[0034] In the present invention, large components such as the anaerobic insulation box 1 are welded to the end face of the waste salt pyrolysis furnace 5, the end face of the secondary combustion chamber 3 is connected to the anaerobic insulation box 1 by welding, small components such as the pushing gearbox 7 and the spiral pusher are connected to the anaerobic insulation box 1 by mechanical seals, and various external connection ports and maintenance entrances are connected to the anaerobic insulation box 1 by flanges, and the waste salt pyrolysis furnace 5 operates at a slightly negative pressure. These measures ensure that the pyrolysis process remains in an anaerobic state without the need for inert gas protection, essentially guaranteeing the safe operation of the pyrolysis furnace and the full carbonization requirements of organic matter.

[0035] A method of use, which is a method of using equipment for anaerobic pyrolysis treatment of industrial waste salt, comprising the following steps: 1) The fuel gas and the combustion-supporting gas enter the secondary combustion chamber 3 through the secondary combustion chamber burner 4 and are ignited and baked until the temperature inside the waste salt pyrolysis furnace 5 reaches the temperature required for waste salt pyrolysis, which is not less than 650 degrees, and the temperature difference inside the waste salt pyrolysis furnace 5 is not more than 25 degrees; 2) The discharge motor 12 is powered on and started, driving the discharge gearbox 11 and the pyrolysis discharge screw conveyor 10 to operate. The waste salt is slowly conveyed from one end to the other end by the shield-shaped screw pusher 6. After pyrolysis, the waste salt falls into the pyrolysis discharge screw conveyor 10 through the other end for discharge. The residence time of the waste salt in the waste salt pyrolysis furnace 5 is controlled to be 30 to 90 minutes. Since the waste gas discharge pipe 15 is connected to the pyrolysis flue gas treatment device, and the pyrolysis flue gas treatment device is connected to the induced draft fan, the waste salt pyrolysis furnace 5 is slightly negative pressure, ensuring that the oxygen concentration in the waste salt pyrolysis furnace 5 is not greater than 0.2%; 3) The pyrolysis gas generated during the pyrolysis of the waste salt is sucked into the secondary combustion chamber 3 and burned by the flame at the end of the secondary combustion chamber burner 4 to produce exhaust gas. The pyrolysis gas stays in the secondary combustion chamber 3 for no less than 2 seconds to fully burn and ensure that the combustible components in the pyrolysis gas are completely oxidized; 4) The pyrolysis waste salt produced by the waste salt pyrolysis furnace 5 is discharged out of the equipment through the discharging device; 5) When the equipment is shut down due to an accident or is shut down for regular maintenance, the waste salt remaining in the pyrolysis furnace can be discharged from the faulty salt discharge port 19 by reversing the spiral pusher; or the anaerobic insulation box 1 can be entered through the maintenance manhole 20 for inspection and maintenance.

[0036] Example 1: (1) First, the composition of waste salt needs to be tested. Specific test indicators include various inorganic salts, such as sodium sulfate, sodium chloride, sodium nitrate, sodium carbonate, etc., as well as the total organic carbon (TOC) value. According to the key components, generally the components with lower melting points, such as sodium nitrate and sodium thiosulfate, they are classified and concentrated into different raw material tanks or raw material tanks. Then, according to the laboratory's guidance on the proportion of compatibility, various types of waste salt are transported and mixed by metering screws, i.e., compatibility, and then evenly fed into the pyrolysis process. The purpose of this is to ensure that the composition of the waste salt entering the pyrolysis process is relatively uniform within a certain range, ensuring the effective adjustment of the pyrolysis operating conditions. (2) The equipment for feeding into pyrolysis can be one or more of belt conveyor, screw conveyor, bucket elevator, etc., and the specific requirements are based on the layout design and equipment selection of different projects; (3) The raw materials entering the equipment for anaerobic pyrolysis of industrial waste salt of the present invention are slowly transported from one end to the other end through the shield-shaped screw pusher 6 built into the waste salt pyrolysis furnace 5, and the heat generated by the continuous combustion of the built-in secondary combustion chamber 3 heat-treats the raw materials in the waste salt pyrolysis furnace 5. The controlled temperature can be 500-800°C, and is selected according to the composition of the raw materials. Usually, the operation is carried out in an anaerobic environment. The TOC in the raw materials is pyrolyzed into carbon under an anaerobic environment, and some impurities such as copper, iron, calcium, magnesium, silicon, etc. react with oxygen-containing substances to form water-insoluble metal oxides. After pyrolysis, the raw materials fall into the pyrolysis discharge screw conveyor 10 through the other end for discharge; (4) The waste gas after pyrolysis first enters the secondary combustion chamber 3 for secondary combustion, in which substances such as hydrogen sulfide and carbon monoxide are burned into sulfur dioxide, carbon dioxide, etc. Depending on the temperature of the exhaust gas, it can be selected whether heat recovery is required. Generally speaking, the flue gas needs to be treated by a pyrolysis flue gas treatment device before being discharged. The flue gas meets the emission standards after quenching, dust removal, desulfurization and denitrification. The pyrolysis flue gas treatment device and method can be redesigned according to the composition of the flue gas. This type of technology belongs to the existing mature technology. For example, the process route of quenching tower + dry deacidification + bag dust removal + ammonia injection + SCR + induced draft fan + chimney can be adopted; (5) When treating sodium-based waste salt whose main components are sodium chloride and sodium sulfate, if the mass ratio of sodium sulfate: sodium chloride is greater than 3:1, the operating temperature is usually 600~650℃; under this temperature condition, and when TOC is greater than 10,000 mg / kg, the pyrolysis time is usually 80~90 minutes, and when TOC is less than 10,000 mg / kg, the pyrolysis time is generally less than 70 minutes. When the mass ratio of sodium sulfate: sodium chloride is close to 1:1, the operating temperature is usually 500~550℃, and when TOC is greater than 10,000 mg / kg, the pyrolysis time is usually 90 minutes, and when TOC is less than 10,000 mg / kg, the pyrolysis time is generally 70~90 minutes.

[0037] Example 2: (1) When treating industrial waste salts rich in sodium thiosulfate produced by the waste alkali liquid treatment unit, the pyrolysis reaction of sodium thiosulfate should be considered in addition to the TOC pyrolysis; (2) When treating this type of salt, since the reaction requires a certain amount of oxygen, a certain concentration of oxygen content (0% to 1%) is allowed during the operation process to ensure that TOC is removed while also allowing the sodium thiosulfate to be completely decomposed into gas and sodium sulfate, and finally the sodium sulfate is recovered through the salt separation device; (3) This type of waste salt generally contains sodium sulfate and sodium carbonate in addition to sodium thiosulfate. Due to the different production processes, this type of waste salt contains less hardness ions. Therefore, the operation process does not require semi-melting operation, and only solid-state pyrolysis is required. However, considering the shortening of pyrolysis time, the pyrolysis temperature is generally 650 degrees and the pyrolysis time is 60 minutes; (4) The waste gas generated by this process contains a certain amount of sulfur dioxide. The flue gas treatment unit needs to be equipped with alkaline washing to deeply remove it until it meets the emission standards. The waste liquid discharged regularly from the alkaline washing (containing sodium sulfite, with a concentration of about 4%m) can be aerated and converted into sodium sulfate and then mixed into the salt separation device to produce sodium sulfate.

[0038] Example 3: (1) Industrial waste salt from the coal chemical industry usually has a low TOC content of less than 10,000 mg / kg. Anaerobic pyrolysis produces fewer combustible components, and it is necessary to continuously burn combustible gas for heat supply during pyrolysis. Therefore, when this device treats industrial waste salt, it can also mix a certain amount of organic waste liquid with waste salt at the front end, thereby reducing the amount of combustible gas.

[0039] (2) This implementation method can significantly reduce the operating costs of industrial waste salt, with a reduction rate of up to 30%.

Claims

1. An apparatus for anaerobic pyrolysis of industrial waste salt, comprising an anaerobic insulation box, the inner walls of which are provided with an insulation layer, characterized in that: A waste salt pyrolysis furnace is fixedly installed in the anaerobic insulation box, and a shield-shaped spiral pusher is installed in the waste salt pyrolysis furnace, and one end of the shield-shaped spiral pusher is connected to a pusher driver located outside the anaerobic insulation box; A waste salt feeding pipe extending upward from the anaerobic insulation box is provided on one end of the waste salt pyrolysis furnace, and a discharging device is provided at the lower part of the other end of the waste salt pyrolysis furnace; A secondary combustion chamber is fixedly arranged in the anaerobic insulation box above the waste salt pyrolysis furnace. The secondary combustion chamber is connected to the waste salt pyrolysis furnace through a pyrolysis gas exhaust pipe. The secondary combustion chamber is also provided with an exhaust gas exhaust pipe extending from the anaerobic insulation box. The exhaust gas exhaust pipe is connected to a pyrolysis flue gas treatment device. The invention also includes a secondary combustion chamber burner arranged outside the anaerobic insulation box, one end of the secondary combustion chamber burner passes through the anaerobic insulation box and extends into the secondary combustion chamber.

2. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 1, characterized in that: The waste salt pyrolysis furnace is a hollow column, and the two ends of the waste salt pyrolysis furnace are respectively welded to the inner walls of the two sides corresponding to the anaerobic insulation box; The circumference of the waste salt pyrolysis furnace is surrounded by three cylindrical arc surfaces, two of which are arranged in parallel, and the other arc surface is a third arc surface. The two arc surfaces arranged in parallel are connected on the sides close to each other, and the sides of the two arc surfaces away from each other are connected through the third arc surface. The central axes of the three cylindrical arc surfaces are arranged parallel to each other; The two parallel arc surfaces are both provided with pyrolysis furnace discharge pipes, and the pyrolysis furnace discharge pipes are both connected to the discharge device; A shield-shaped spiral pusher is respectively arranged in the area of ​​the two parallel arc surfaces.

3. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 2, characterized in that: Two waste salt feeding pipes are arranged on the third arc surface, and the two waste salt feeding pipes are respectively arranged corresponding to the areas where the two parallel arc surfaces are located.

4. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 2, characterized in that: The diameters of the circles containing the two parallel arc surfaces are equal.

5. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 2, characterized in that: The shield-shaped spiral pusher is a shield-shaped spiral pusher whose size matches the cylindrical arc surface on which it is located.

6. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 1, characterized in that: The waste salt pyrolysis furnaces are provided in two numbers, the two waste salt pyrolysis furnaces are arranged in parallel with each other, and the two waste salt pyrolysis furnaces are respectively connected to the secondary combustion chamber through pyrolysis gas exhaust pipes.

7. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 1, characterized in that: The discharging device includes a pyrolysis discharging screw conveyor, one end of which is welded to the inner wall of one side of the anaerobic insulation box, and the other end of which passes through the other side of the anaerobic insulation box and is connected to the waste salt discharge port; One end of the pyrolysis discharging screw conveyor away from the waste salt discharging port is sequentially connected to a discharging gearbox and a discharging motor arranged outside the anaerobic insulation box.

8. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 1, characterized in that: The pushing drive comprises a connected pushing motor, and the pushing motor is connected to the shield-shaped spiral pusher through a pushing gearbox.

9. The equipment for anaerobic pyrolysis treatment of industrial waste salt according to claim 1, characterized in that: The waste salt pyrolysis furnace is also connected to a fault salt discharge port located outside the anaerobic insulation box at one end of the waste salt feed pipe; The anaerobic insulation box is also provided with an inspection manhole.

10. A method of use, which is a method of using the equipment for anaerobic pyrolysis treatment of industrial waste salt as claimed in claim 1, characterized in that: The following steps are involved: 1) The fuel gas and the combustion-supporting gas enter the secondary combustion chamber through the secondary combustion chamber burner and ignite the furnace until the temperature inside the waste salt pyrolysis furnace reaches the temperature required for waste salt pyrolysis, and the temperature difference inside the waste salt pyrolysis furnace is no more than 25 degrees; 2) The discharge motor is powered on and started, driving the discharge gearbox and the pyrolysis discharge screw conveyor to operate, controlling the residence time of the waste salt in the waste salt pyrolysis furnace to be 30 to 90 minutes. Since the waste gas discharge pipe is connected to the pyrolysis flue gas treatment device, and the pyrolysis flue gas treatment device is connected to the induced draft fan, the waste salt pyrolysis furnace is slightly negatively pressurized, ensuring that the oxygen concentration in the waste salt pyrolysis furnace is no more than 0.2%; 3) The pyrolysis gas generated during the pyrolysis of waste salt is sucked into the secondary combustion chamber and burned by the flame at the end of the burner in the secondary combustion chamber to produce exhaust gas. The pyrolysis gas stays in the secondary combustion chamber for no less than 2 seconds to fully burn and ensure that the combustible components in the pyrolysis gas are completely oxidized; 4) The pyrolysis waste salt produced by the waste salt pyrolysis furnace is discharged out of the equipment through the discharging device; 5) When the equipment is shut down due to an accident or regularly shut down for maintenance, the waste salt remaining in the pyrolysis furnace can be discharged from the faulty salt discharge port by means of the reverse pyrolysis discharge screw conveyor; or the anaerobic insulation box can be entered through the maintenance manhole for inspection and maintenance.

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