Waste salt pyrolysis device

Abstract

The utility model discloses a waste salt pyrolysis device, which belongs to the field of solid waste treatment and comprises a first pre-drying device, a second carbonization furnace, a second fuel gas supply device, a second purification device and a third high-temperature pyrolysis component. Wherein the first pre-drying device is used for pre-drying waste salt to be treated; the first pre-drying device is connected with the second carbonization furnace; and the second fuel gas supply device is connected with the second purification device and can provide fuel gas for the second carbonization furnace to serve as a fuel source of the second fuel gas supply device. Two-stage pyrolysis is adopted, so that waste salt can be uniformly heated stage by stage, and coking is avoided. Meanwhile, sectional treatment is adopted, full pyrolysis of the waste salt is achieved, and it is determined that the organic matter pyrolysis removal rate is larger than 99.5%; in the pyrolysis process, generation of dioxin can be effectively restrained, and air pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the field of solid waste treatment, in particular to a waste salt pyrolysis device. Background Art

[0002] A large amount of industrial waste salt is generated in the industrial production processes of pesticide intermediates, drug synthesis, printing and dyeing. These industrial waste salts contain a large amount of toxic and harmful organic matter and salts. The organic matter has a high concentration and is very harmful, making it difficult to treat biochemically.

[0003] For this reason, people have also conducted corresponding research. For example, Chinese patent application CN202210963057.6 discloses a solid waste salt countercurrent rotary kiln pyrolysis device, system and method, which includes a countercurrent rotary kiln pyrolysis furnace, a hot blast furnace, a solid waste salt spiral feeding device, an auxiliary burner, an auxiliary burner combustion-supporting fan, a pyrolysis fan, a water-cooled spiral discharging device, an oxygen meter and a CO analyzer. The hot blast furnace provides the pyrolysis furnace with a stable and adjustable temperature of hot air. The solid waste salt goes through a drying stage, a low-temperature pyrolysis stage, and a medium-temperature pyrolysis gasification stage from the kiln tail to the kiln head of the countercurrent rotary kiln pyrolysis furnace, thereby completely removing organic pollutants.

[0004] Chinese patent application CN202110769187.1 discloses a system and method for treating waste salt using a two-stage pyrolysis technology, which includes a primary crusher, a conveyor, a first-stage pyrolysis furnace, a secondary crusher, a second-stage pyrolysis furnace, a waste salt recovery device, a first-stage hot blast furnace, a second-stage hot blast furnace and a waste gas treatment device; it also involves a method for treating waste salt using a two-stage pyrolysis technology, the steps of which are: using a crusher to crush the waste salt into uniform particles; transporting the waste salt particles to a two-stage pyrolysis furnace for pyrolysis treatment; collecting the waste salt after pyrolysis and treating the waste gas generated by pyrolysis.

[0005] How to achieve harmless treatment of industrial waste salt has always been a technical problem that urgently needs to be solved. Utility Model Content

[0006] The invention aims to provide a waste salt pyrolysis device, which can ensure that the waste salt is evenly heated step by step and avoid coking by adopting a segmented oxygen control method.

[0007] In order to achieve the above purpose, this application adopts the following technical solutions:

[0008] A waste salt pyrolysis device, comprising:

[0009] A first pre-drying device, which is used to pre-dry the waste salt to be treated;

[0010] A second carbonization furnace, which is connected to the first pre-drying device, and the second carbonization furnace can carbonize the waste salt treated by the first pre-drying device;

[0011] A second gas supply device is connected to the second carbonization furnace, and the second gas supply device can provide gas to the second carbonization furnace as a fuel source for the second gas supply device;

[0012] A second purification device, which is connected to the second carbonization furnace and can purify the flue gas generated by the second carbonization furnace;

[0013] A third high-temperature cracking component is connected to the second carbonization furnace, and the waste salt treated in the second carbonization furnace can be sent to the third high-temperature cracking component for high-temperature cracking;

[0014] The third high temperature cracking assembly includes a third bracket, a third sleeve, a third rotating drum, a third rotating device, a third combustion device, a third flue gas duct, and a control system;

[0015] The third sleeve is connected to the third bracket and the third sleeve is fixedly connected to the third bracket, the third rotating drum is arranged in the third sleeve and the third rotating drum can rotate relative to the third sleeve, and the third rotating device is connected to the third rotating drum and the third rotating device can drive the third rotating drum to rotate;

[0016] The third combustion device is connected to the third flue gas duct and the flue gas generated by the third combustion device can enter the third flue gas duct;

[0017] The third sleeve is respectively provided with a waste salt inlet, a waste salt outlet, a flue gas inlet, and a flue gas outlet. The waste salt inlet is connected to the second carbonization furnace, and the waste salt treated in the second carbonization furnace can be sent to the third rotating drum through the waste salt inlet for high-temperature cracking. The horizontal plane where the waste salt outlet is located is located above the horizontal plane where the waste salt inlet is located, and the material treated in the third rotating drum can be sent out through the waste salt outlet;

[0018] The third flue gas duct is connected to the flue gas inlet, and the flue gas generated by the third combustion device can enter the third drum through the third flue gas duct and the flue gas inlet in sequence, and the flue gas outlet is located near the waste salt inlet, and the flue gas contacts the waste salt in the third drum in reverse direction and can be discharged through the flue gas outlet after high-temperature cracking of the waste salt;

[0019] The third rotating device is connected to the control system.

[0020] The third high-temperature cracking component also includes a third gas supply device, which is connected to the third combustion device and can provide gas to the third combustion device as a fuel source for the third combustion device.

[0021] The second gas supply device and the third gas supply device are natural gas supply devices respectively.

[0022] The second carbonization furnace is made of heat-resistant steel material.

[0023] The second carbonization furnace is made of 310S stainless steel.

[0024] The third rotating drum is coaxially arranged with the third sleeve.

[0025] The axial direction of the third rotating drum is inclined relative to the horizontal direction.

[0026] The third sleeve and the third flue gas duct are respectively made of heat-insulating materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the waste salt pyrolysis device in Example 1.

[0028] Figure 2 This is a schematic diagram of the structure of the third high-temperature cracking component in Example 1.

[0029] Markings in the figure: 1. first pre-drying device, 2. second carbonization furnace, 3. second gas supply device, 4. second purification device, 5. third high-temperature cracking assembly, 11. third bracket, 12. third sleeve, 13. third rotating drum, 14. third rotating device, 15. third combustion device, 16. third flue gas duct, 17. waste salt inlet, 18. flue gas inlet, 19. flue gas outlet. DETAILED DESCRIPTION

[0030] The utility model is described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] The present embodiment provides a waste salt pyrolysis device, including a first pre-drying device, a second carbonization furnace, a second gas supply device, a second purification device, and a third high-temperature cracking component. Among them, the first pre-drying device is used to pre-dry the waste salt to be treated; the first pre-drying device is connected to the second carbonization furnace, and the second carbonization furnace can carbonize the waste salt treated by the first pre-drying device; the second gas supply device is connected to the second purification device, and the second gas supply device can provide gas to the second carbonization furnace as a fuel source for the second gas supply device; the second purification device is connected to the second carbonization furnace, and the second purification device can purify the flue gas generated by the second carbonization furnace; the second carbonization furnace is connected to the third high-temperature cracking component. In this embodiment, the second carbonization furnace is made of 310S stainless steel, and the second gas supply device is a natural gas supply device.

[0033] The waste salt treatment process is as follows: the waste salt to be treated is first sent to the first pre-drying device for low-temperature drying pretreatment; then, the waste salt enters the second carbonization furnace for combustion treatment; the second gas supply device provides fuel for the combustion of the second carbonization furnace, and the second purification device treats the flue gas generated by the combustion of the second carbonization furnace; finally, the waste salt enters the third high-temperature cracking component for high-temperature pyrolysis.

[0034] In this embodiment, the third high temperature cracking assembly includes a third bracket, a third sleeve, a third drum, a third rotating device, a third combustion device, a third flue gas pipe, and a control system, and the third rotating device is connected to the control system. Among them, the third sleeve is connected to the third bracket, and the third drum is arranged in the third sleeve; the third rotating device is connected to the third drum, and the third rotating device can drive the third drum to rotate; the third combustion device is connected to the third flue gas pipe, and the flue gas generated by the third combustion device can enter the third flue gas pipe. At the same time, the third sleeve is respectively provided with a waste salt inlet, a waste salt outlet, a flue gas inlet, and a flue gas outlet. The waste salt inlet is connected to the second carbonization furnace; the horizontal plane where the waste salt outlet is located is located above the horizontal plane where the waste salt inlet is located, and the processed materials in the third drum can be sent out through the waste salt outlet; the third flue gas pipe is connected to the flue gas inlet, and the flue gas generated by the third combustion device can enter the third drum through the third flue gas pipe and the flue gas inlet in turn; the flue gas outlet is located near the waste salt inlet, and the flue gas contacts the waste salt in the third drum in reverse direction and performs high temperature cracking on the waste salt, and can be discharged through the flue gas outlet.

[0035] Furthermore, the third high-temperature cracking assembly also includes a third gas supply device, which is connected to the third combustion device, and the third gas supply device can provide gas to the third combustion device as a fuel source for the third combustion device. Preferably, the third drum and the third sleeve are coaxially arranged, and the axial direction of the third drum is inclined relative to the horizontal direction. Furthermore, the third gas supply device uses a natural gas supply device, and the third sleeve and the third flue gas duct are respectively made of heat-insulating materials.

[0036] With this structure, the waste salt treated by the second carbonization furnace enters the third drum through the waste salt inlet, undergoes high-temperature cracking in the third drum, and is finally discharged from the waste salt outlet; during this process, the flue gas generated by the third combustion device enters the third drum through the third flue gas duct and the flue gas inlet in turn, and is discharged through the flue gas outlet after heat exchange with the waste salt in the third drum. The axial direction of the third drum is tilted relative to the horizontal direction; with this structure, the waste moves upward from bottom to top; and the flue gas enters the third drum from the upper flue gas inlet, and is finally discharged from the lower flue gas outlet.

[0037] In the present application, the barrel of the second carbonization furnace is preferably made of 310S heat-resistant steel, and the part in contact with the material is a metal part, which has fast heat transfer and will not pollute the material. In the present application, the waste salt is treated by the device, and organic matter and other easily decomposable salts are effectively decomposed, thereby realizing the effective recovery of inorganic salts.

[0038] Example 1

[0039] The above-mentioned device was used to treat the waste salt produced by the wastewater treatment of a coal chemical enterprise. The waste salt contained the following components: sodium chloride and sodium sulfate totaling 96.30%, total organic carbon (TOC) 1.23%, and water and other impurity ions 2.47%.

[0040] The product after treatment by the device was measured, and the components in the product were as follows: sodium chloride and sodium sulfate totaled 98.3%, total organic carbon (TOC) 0.04%, and water and other impurity ions 1.66%.

[0041] Example 2

[0042] The above-mentioned device was used to treat the waste salt produced by the wastewater treatment of a coal-to-oil enterprise. The waste salt contained the following components: sodium chloride and sodium sulfate totaling 94.67%, total organic carbon (TOC) 1.45%, and water and other impurity ions 3.88%.

[0043] The product after treatment by the device was measured, and the components in the product were as follows: sodium chloride and sodium sulfate totaled 97.92%, total organic carbon (TOC) 0.12%, and water and other impurity ions 1.96%.

[0044] Example 3

[0045] The above-mentioned device is used to treat the waste salt generated by the wastewater treatment of pharmaceutical enterprises. The waste salt contains the following components: sodium chloride and sodium sulfate totaling 92.60%, total organic carbon (TOC) 2.63%, and water and other impurity ions 4.77%.

[0046] The product after treatment by the device was measured, and the components in the product were as follows: sodium chloride and sodium sulfate totaled 97.50%, total organic carbon (TOC) 0.23%, and water and other impurity ions 2.27%.

[0047] Example 4

[0048] The above-mentioned device was used to treat the waste salt produced by the wastewater treatment of a chemical enterprise. The waste salt contained the following components: sodium chloride and sodium sulfate totaling 95.40%, total organic carbon (TOC) 0.48%, and water and other impurity ions 4.12%.

[0049] The product after treatment by the device was measured, and the components in the product were as follows: sodium chloride and sodium sulfate totaled 98.62%, total organic carbon (TOC) 0.04%, and water and other impurity ions 1.34%.

[0050] In summary, compared with the prior art, this application has the following advantages:

[0051] (1) The present application adopts two-stage pyrolysis, which can ensure that the waste salt is evenly heated step by step to avoid coking;

[0052] (2) This application adopts staged treatment to achieve full pyrolysis of waste salt. It has been determined that the pyrolysis removal rate of organic matter is greater than 99.5%;

[0053] (3) During the pyrolysis process, the generation of dioxins can be effectively curbed, reducing air pollution;

[0054] (4) This application can achieve the effective recycling of inorganic salts in waste salt, with a high recycling rate, without causing pollution and waste, and can effectively realize the resource utilization of waste salt, with good application prospects.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste salt pyrolysis device, characterized in that: include: A first pre-drying device, which is used to pre-dry the waste salt to be treated; A second carbonization furnace, which is connected to the first pre-drying device, and the second carbonization furnace can carbonize the waste salt treated by the first pre-drying device; A second gas supply device is connected to the second carbonization furnace, and the second gas supply device can provide gas to the second carbonization furnace as a fuel source for the second gas supply device; A second purification device, which is connected to the second carbonization furnace and can purify the flue gas generated by the second carbonization furnace; A third high-temperature cracking component is connected to the second carbonization furnace, and the waste salt treated in the second carbonization furnace can be sent to the third high-temperature cracking component for high-temperature cracking; The third high temperature cracking assembly includes a third bracket, a third sleeve, a third rotating drum, a third rotating device, a third combustion device, a third flue gas duct, and a control system; The third sleeve is connected to the third bracket and the third sleeve is fixedly connected to the third bracket, the third rotating drum is arranged in the third sleeve and the third rotating drum can rotate relative to the third sleeve, and the third rotating device is connected to the third rotating drum and the third rotating device can drive the third rotating drum to rotate; The third combustion device is connected to the third flue gas duct and the flue gas generated by the third combustion device can enter the third flue gas duct; The third sleeve is respectively provided with a waste salt inlet, a waste salt outlet, a flue gas inlet, and a flue gas outlet. The waste salt inlet is connected to the second carbonization furnace, and the waste salt treated in the second carbonization furnace can be sent to the third rotating drum through the waste salt inlet for high-temperature cracking. The horizontal plane where the waste salt outlet is located is located above the horizontal plane where the waste salt inlet is located, and the material treated in the third rotating drum can be sent out through the waste salt outlet; The third flue gas duct is connected to the flue gas inlet, and the flue gas generated by the third combustion device can enter the third drum through the third flue gas duct and the flue gas inlet in sequence, and the flue gas outlet is located near the waste salt inlet, and the flue gas contacts the waste salt in the third drum in reverse direction and can be discharged through the flue gas outlet after high-temperature cracking of the waste salt; The third rotating device is connected to the control system.

2. The waste salt pyrolysis device according to claim 1, characterized in that: The third high-temperature cracking component also includes a third gas supply device, which is connected to the third combustion device and can provide gas to the third combustion device as a fuel source for the third combustion device.

3. The waste salt pyrolysis device according to claim 2, characterized in that: The second gas supply device and the third gas supply device are natural gas supply devices respectively.

4. The waste salt pyrolysis device according to claim 1, characterized in that: The second carbonization furnace is made of heat-resistant steel material.

5. The waste salt pyrolysis device according to claim 4, characterized in that: The second carbonization furnace is made of 310S stainless steel.

6. The waste salt pyrolysis device according to claim 1, characterized in that: The third rotating drum is coaxially arranged with the third sleeve.

7. The waste salt pyrolysis device according to claim 6, characterized in that: The axial direction of the third rotating drum is inclined relative to the horizontal direction.

8. The waste salt pyrolysis device according to any one of claims 1 to 7, characterized in that: The third sleeve and the third flue gas duct are respectively made of heat-insulating materials.

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