Waste tire pyrolysis characteristic testing system and method

Abstract

The invention provides a waste tire pyrolysis characteristic testing system and method, and relates to the technical field of waste tire pyrolysis test.The waste tire pyrolysis characteristic testing system comprises a rotary kiln, a pyrolysis coke collector, a pyrolysis oil collecting unit, a gas washing device and a gas collecting bag, and the rotary kiln is provided with a pyrolysis cavity and is provided with a pyrolysis coke outlet and an oil-gas mixture outlet which are communicated with the pyrolysis cavity; the pyrolytic coke collector is communicated with the pyrolytic coke outlet; the pyrolytic oil collecting unit comprises a first-stage condenser, a high-flash-point oil storage tank, a second-stage condenser and a low-flash-point oil storage tank, the oil-gas mixture outlet, the first-stage condenser and the second-stage condenser are sequentially communicated, a pyrolytic oil outlet of the first-stage condenser is communicated with the high-flash-point oil storage tank, and a pyrolytic oil outlet of the second-stage condenser is communicated with the low-flash-point oil storage tank; and a pyrolysis gas outlet of the secondary condenser, the gas washing device and the gas collecting bag are communicated in sequence. According to the invention, different waste tire materials can be pyrolyzed, and a basis is provided for determination of pyrolysis process parameters by researching the influence of different reaction conditions on the characteristics of waste tire particle pyrolysis products.

Description

Technical Field

[0001] The present invention relates to the technical field of waste tire pyrolysis testing, and in particular to a waste tire pyrolysis characteristic testing system and method. Background Art

[0002] Pyrolysis of waste tires can produce high-value products such as pyrolysis gas, pyrolysis oil, and pyrolysis coke. However, different reaction conditions during the pyrolysis process significantly influence the composition and properties of the pyrolysis products. To obtain higher-value waste tire pyrolysis products and improve the economic efficiency of the pyrolysis process, it is necessary to clarify the impact of different reaction conditions on the properties of the pyrolysis products of different waste tire materials. This will help determine the pyrolysis process parameters that result in higher-value and more economical pyrolysis products.

[0003] However, the related art lacks a system for determining different waste tire pyrolysis process parameters before waste tire pyrolysis, which restricts the acquisition of higher-value pyrolysis products from waste tires and reduces the economic efficiency of the pyrolysis process. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of one aspect of the present invention provides a waste tire pyrolysis characteristics testing system. The waste tire pyrolysis characteristics testing system is capable of pyrolyzing different waste tire materials. By studying the effects of different reaction conditions on the characteristics of the pyrolysis products of waste tire particles, a basis is provided for determining pyrolysis process parameters, thereby improving the value of the pyrolysis products and the economic efficiency of the pyrolysis process.

[0006] Another aspect of the present invention provides a method for testing the pyrolysis characteristics of waste tires.

[0007] According to an embodiment of the present invention, a waste tire pyrolysis characteristics testing system includes a rotary kiln, a pyrolysis coke collector, a pyrolysis oil collection unit, a scrubbing device and an air collection bag. The rotary kiln has a pyrolysis chamber and is provided with a pyrolysis coke outlet and an oil-gas mixture outlet connected to the pyrolysis chamber. The pyrolysis chamber is used to pyrolyze waste tire particles; the pyrolysis coke collector is connected to the pyrolysis coke outlet; the pyrolysis oil collection unit includes a primary condenser, a high-flash-point oil storage tank, a secondary condenser and a low-flash-point oil storage tank. The oil-gas mixture outlet, the primary condenser and the secondary condenser are connected in sequence. The pyrolysis oil outlet of the primary condenser is connected to the high-flash-point oil storage tank, and the pyrolysis oil outlet of the secondary condenser is connected to the low-flash-point oil storage tank; the pyrolysis gas outlet of the secondary condenser, the scrubbing device and the air collection bag are connected in sequence. The air collection bag is used to store the scrubbed pyrolysis gas.

[0008] According to the waste tire pyrolysis characteristics testing system of the embodiment of the present invention, the waste tire particles that have been stripped of steel wire and crushed are received by the rotary kiln, so that the waste tire particles are pyrolyzed in the pyrolysis chamber to obtain pyrolysis coke and oil-gas mixture, the pyrolysis coke is stored in the pyrolysis coke collector, and the oil-gas mixture is cooled and separated by the primary condenser to obtain high flash point pyrolysis oil and intermediate products, wherein the high flash point pyrolysis oil is stored in the high flash point oil storage tank, and the intermediate product continues to enter the secondary condenser to be cooled and separated into low flash point pyrolysis oil and pyrolysis gas, the low flash point pyrolysis oil is stored in the low flash point oil storage tank, and the pyrolysis gas is washed by the scrubber and stored in the gas collection bag, so that the test system can realize the "three-state pyrolysis products" (generally including pyrolysis The waste tire char, pyrolysis oil, and pyrolysis gas are recovered separately, so that by changing the reaction conditions in the test system (including the residence time of the waste tire particles in the pyrolysis chamber, the final pyrolysis temperature of the waste tire particles, and the heating rate during pyrolysis, etc.), the effects of different reaction conditions on the characteristics of the "three-state pyrolysis products" are analyzed based on the recovered pyrolysis char, pyrolysis oil, and pyrolysis gas, and the optimal process parameters for the pyrolysis of the tested waste tire are determined. Therefore, compared with related technologies, the present invention can pyrolyze different waste tire materials. By studying the effects of different reaction conditions on the characteristics of the pyrolysis products of waste tire particles, a basis is provided for determining the pyrolysis process parameters, so as to improve the value of the pyrolysis products and the economic efficiency of the pyrolysis process.

[0009] In some embodiments, the test system also includes a high-temperature electric heating furnace and a temperature controller. The high-temperature electric heating furnace is provided in the rotary kiln and is used to heat the pyrolysis chamber. The high-temperature electric heating furnace includes a heating section, a pyrolysis section and a secondary reaction section arranged in sequence along the extension direction of the pyrolysis chamber. The temperature controller is electrically connected to the heating section, the pyrolysis section and the secondary reaction section respectively.

[0010] In some embodiments, the rotary kiln is further provided with a temperature measuring point, which is used to monitor the temperature of the pyrolysis chamber;

[0011] There are multiple temperature measuring points, which are arranged at intervals along the extension direction of the pyrolysis chamber.

[0012] In some embodiments, the testing system further includes a temperature patrol meter, which can simultaneously measure the temperature of the pyrolysis chamber at all the temperature measurement points.

[0013] In some embodiments, the rotary kiln is further provided with a gas inlet connected to the pyrolysis chamber;

[0014] The testing system further includes a steam generator and a first steam pipe. The steam generator is provided with a first steam outlet. The first steam outlet, the first steam pipe and the gas inlet are sequentially connected to provide activation steam to the pyrolysis chamber.

[0015] In some embodiments, the test system further includes a steam buffer bottle, a first regulating valve and a first flow meter, and the steam buffer bottle, the first regulating valve and the first flow meter are sequentially provided on the first steam pipe.

[0016] In some embodiments, the steam generator is further provided with a second steam outlet;

[0017] The test system also includes a second steam pipe and a second regulating valve. The second steam outlet, the second steam pipe and the steam inlet of the primary condenser are connected in sequence to provide cooling steam to the primary condenser. The second steam pipe is provided with the second regulating valve.

[0018] In some embodiments, the scrubbing device includes an alcohol absorption tank and an alkali solution absorption tank, and the pyrolysis gas outlet of the secondary condenser, the alcohol absorption tank, the alkali solution absorption tank and the gas collecting bag are connected in sequence.

[0019] In some embodiments, the rotary kiln is further provided with a gas inlet connected to the pyrolysis chamber, and the testing system further includes a nitrogen gas cylinder group, a gas supply pipeline, a third regulating valve and a second flow meter.

[0020] Wherein, the nitrogen gas cylinder group, the gas supply pipeline and the gas inlet are sequentially connected to purge the residual air in the gas supply pipeline and the pyrolysis chamber;

[0021] Wherein, the third regulating valve and the second flow meter are provided on the gas supply pipeline.

[0022] According to an embodiment of the present invention, a method for testing pyrolysis characteristics of waste tires comprises the following steps:

[0023] Pyrolysis: placing waste tire particles in the pyrolysis chamber of a rotary kiln for pyrolysis to obtain pyrolysis coke and oil-gas mixture;

[0024] The pyrolysis coke is collected and the oil-gas mixture is separated, the pyrolysis coke is stored in the pyrolysis coke collector, and the oil-gas mixture is passed into a primary condenser for cooling and separation to obtain high-flash-point pyrolysis oil and intermediate products, the high-flash-point pyrolysis oil is stored in a high-flash-point oil storage tank, and the intermediate products are further passed into a secondary condenser for cooling and separation to obtain low-flash-point pyrolysis oil and pyrolysis gas, and the low-flash-point pyrolysis oil is stored in a low-flash-point oil storage tank;

[0025] Pyrolysis gas is collected and passed through a gas scrubber to obtain purified pyrolysis gas, which is then stored in a gas collection bag;

[0026] The process parameters are determined, the effects of different reaction conditions on pyrolysis coke, pyrolysis oil and pyrolysis gas are analyzed, and the optimal process parameters for waste tire pyrolysis are determined.

[0027] The technical advantages of the waste tire pyrolysis characteristics testing method according to the embodiment of the present invention are the same as the technical advantages of the waste tire pyrolysis characteristics testing system described above, and will not be repeated here.

[0028] In some embodiments, during the pyrolysis operation, the waste tire particles have a particle size of 2.5 mm to 7.0 mm;

[0029] The rotation speed of the rotary kiln is r, and r is 0.2rpm-2.0rpm;

[0030] The residence time of the waste tire particles in the pyrolysis chamber is t, and t is 30 min-60 min;

[0031] The final pyrolysis temperature of the waste tire particles in the pyrolysis chamber is T, and T is 400°C-700°C;

[0032] The heating rate of the high-temperature electric heating furnace is δ, and δ is 10°C / min-40°C / min.

[0033] In some embodiments, the flash point of the high flash point pyrolysis oil is F1, and F1>60°C;

[0034] The flash point of the low-flash-point pyrolysis oil is F2, and F2 is 10°C-20°C.

[0035] In some embodiments, before the pyrolysis operation, the testing method further comprises the steps of:

[0036] Nitrogen purging: nitrogen is introduced into the pyrolysis chamber from a nitrogen cylinder assembly to purge and remove residual air, so that the pyrolysis chamber is in an inert atmosphere;

[0037] Steam activation: Activated steam is introduced into the pyrolysis chamber from a steam generator.

[0038] In some embodiments, during the nitrogen purge operation, the nitrogen carrier gas flow rate is 200 mL / min-800 mL / min.

[0039] In some embodiments, the temperature of the activation steam is T1, and T1 is 800° C.-1000° C., and the flow rate of the activation steam is υ, and υ is 0.20 g / min-0.25 g / min.

[0040] In some embodiments, the steam generator further passes cooling steam into the primary condenser, the temperature of the cooling steam is T2, and T2 is 100°C-200°C.

[0041] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 2 is a schematic structural diagram of a waste tire pyrolysis characteristics testing system according to an embodiment of the present invention.

[0043] Figure 2 4 is a flow chart of a method for testing pyrolysis characteristics of waste tires according to an embodiment of the present invention.

[0044] Reference numerals:

[0045] 1. Rotary kiln; 11. Pyrolysis chamber; 12. Pyrolysis coke outlet; 13. Oil-gas mixture outlet; 14. Temperature measuring point; 15. Temperature inspection instrument; 16. Gas inlet;

[0046] 2. Pyrolysis coke collector;

[0047] 3. Pyrolysis oil collection unit; 31. Primary condenser; 32. High flash point oil storage tank; 33. Secondary condenser; 34. Low flash point oil storage tank;

[0048] 4. Gas washing device; 41. Alcohol absorption tank; 42. Alkali solution absorption tank;

[0049] 5. Air collection bag;

[0050] 6. High-temperature electric heating furnace; 61. Temperature controller; 62. Heating section; 63. Pyrolysis section; 64. Secondary reaction section;

[0051] 7. Steam generator; 71. First steam pipe; 72. First steam outlet; 73. Steam buffer bottle; 74. First regulating valve; 75. First flow meter; 76. Second steam outlet; 77. Second steam pipe; 78. Second regulating valve;

[0052] 8. Nitrogen cylinder assembly; 81. Gas supply pipeline; 82. Third regulating valve; 83. Second flow meter. DETAILED DESCRIPTION

[0053] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0054] like Figure 1As shown, a waste tire pyrolysis characteristics testing system according to an embodiment of the present invention includes a rotary kiln 1, a pyrolysis coke collector 2, a pyrolysis oil collection unit 3, a scrubber 4, and an air collecting bag 5. The rotary kiln 1 has a pyrolysis chamber 11 and is provided with a pyrolysis coke outlet 12 and an oil-gas mixture outlet 13 connected to the pyrolysis chamber 11. The pyrolysis chamber 11 is used to pyrolyze waste tire particles; the pyrolysis coke collector 2 is connected to the pyrolysis coke outlet 12; the pyrolysis oil collection unit 3 includes a primary condenser 31, a high flash point oil storage tank 32, a secondary condenser 33, and a low flash point oil storage tank 34. The oil-gas mixture outlet 13, the primary condenser 31, and the secondary condenser 33 are connected in sequence. The pyrolysis oil outlet of the primary condenser 31 is connected to the high flash point oil storage tank 32, and the pyrolysis oil outlet of the secondary condenser 33 is connected to the low flash point oil storage tank 34; the pyrolysis gas outlet of the secondary condenser 33, the scrubber 4, and the air collecting bag 5 are connected in sequence. The air collecting bag 5 is used to store the pyrolysis gas after scrubbing.

[0055] According to the waste tire pyrolysis characteristics testing system of the embodiment of the present invention, the rotary kiln 1 receives the waste tire particles after stripping the steel wire and crushing, so that the waste tire particles are pyrolyzed in the pyrolysis chamber 11 to obtain pyrolysis coke and oil-gas mixture, and the pyrolysis coke is stored in the pyrolysis coke collector 2, and the oil-gas mixture is cooled and separated by the primary condenser 31 to obtain high flash point pyrolysis oil and intermediate products, wherein the high flash point pyrolysis oil is stored in the high flash point oil storage tank 32, and the intermediate product continues to enter the secondary condenser 33 to be cooled and separated into low flash point pyrolysis oil and pyrolysis gas, and the low flash point pyrolysis oil is stored in the low flash point oil storage tank 34, and the pyrolysis gas is washed by the scrubber 4 and stored in the gas collecting bag 5, so that the testing system can realize the "pyrolysis three-state product" ( The test system generally includes the separate recovery of pyrolysis coke, pyrolysis oil, and pyrolysis gas, so that by changing the reaction conditions in the test system (including the residence time of the waste tire particles in the pyrolysis chamber 11, the final pyrolysis temperature of the waste tire particles, and the heating rate during pyrolysis, etc.), based on the recovered pyrolysis coke, pyrolysis oil, and pyrolysis gas, the effects of different reaction conditions on the characteristics of the "three-state pyrolysis products" are analyzed, and the optimal process parameters for the pyrolysis of the tested waste tire are determined. Therefore, compared with related technologies, the present invention can pyrolyze different waste tire materials. By studying the effects of different reaction conditions on the characteristics of the pyrolysis products of waste tire particles, a basis is provided for determining the pyrolysis process parameters, so as to improve the value of the pyrolysis products and the economic efficiency of the pyrolysis process.

[0056] It can be understood that the cooperation between the primary condenser 31 and the secondary condenser 33 can separate the pyrolysis oil in the oil-gas mixture into high-flash point pyrolysis oil and low-flash point pyrolysis oil, so as to determine the pyrolysis reaction conditions of the corresponding waste tire particles through the test system according to the actual working conditions for high-flash point pyrolysis oil and low-flash point pyrolysis oil. The scrubber 4 in the test system can remove impurities in the pyrolysis gas to obtain pyrolysis gas with better purity, which is conducive to ensuring accurate analysis of the pyrolysis gas characteristics and avoiding interference factors.

[0057] It should be noted that the characteristics of "thermal three-state products" include:

[0058] 1) The yield and ratio of the three-phase pyrolysis products, that is, the yield of each of pyrolysis coke, high-flash point pyrolysis oil, low-flash point pyrolysis oil and pyrolysis gas;

[0059] 2) Chemical substances and structure contained in pyrolytic coke;

[0060] 3) Composition, calorific value, viscosity and density of pyrolysis oil;

[0061] 4) Composition and calorific value of pyrolysis gas, etc.

[0062] In addition, the above analysis of the characteristics of the "three-state pyrolysis products" can be obtained using existing instruments and methods in the field, and will not be repeated here.

[0063] like Figure 1 As shown, in some embodiments, the test system also includes a high-temperature electric heating furnace 6 and a temperature controller 61. The high-temperature electric heating furnace 6 is provided in the rotary kiln 1 and is used to heat the pyrolysis chamber 11. The high-temperature electric heating furnace 6 includes a heating section 62, a pyrolysis section 63 and a secondary reaction section 64 arranged in sequence along the extension direction of the pyrolysis chamber 11. The temperature controller 61 is electrically connected to the heating section 62, the pyrolysis section 63 and the secondary reaction section 64, respectively, so that the temperature of each section can be controlled by the temperature controller 61 respectively.

[0064] It can be understood that the high-temperature electric heating furnace 6 and the temperature controller 61 cooperate to provide a three-stage programmable heat source for the pyrolysis chamber 11, so as to realize the temperature control of the pyrolysis chamber 11 in different sections, thereby ensuring the pyrolysis effect of the waste tire particles and reducing the energy consumption of the waste tire pyrolysis to a certain extent.

[0065] Specifically, the extension direction of the pyrolysis chamber 11 can be consistent with the extension direction of the rotary kiln 1 and the extension direction of the high-temperature electric heating furnace 6. The length of the high-temperature electric heating furnace 6 can be similar to that of the pyrolysis chamber 11, so that the pyrolysis chamber 11 is divided into three sections by the heating section 62, pyrolysis section 63, and secondary reaction section 64 of the high-temperature electric heating furnace 6. This allows for segmented control of the pyrolysis temperature and reduces unnecessary energy waste during the pyrolysis process. The operating principles of the high-temperature electric heating furnace 6 and temperature controller 61 can adopt existing technologies in the field and will not be further elaborated here.

[0066] like Figure 1 As shown, in some embodiments, the rotary kiln 1 is further provided with a temperature measuring point 14 , which is used to monitor the temperature of the pyrolysis chamber 11 .

[0067] There are multiple temperature measuring points 14 which are arranged at intervals along the extension direction of the pyrolysis chamber 11 .

[0068] Preferably, there are multiple temperature measuring points 14 and they are arranged at equal intervals along the extension direction of the pyrolysis chamber 11 to improve the monitoring accuracy of the temperature at each position of the pyrolysis chamber 11.

[0069] like Figure 1 As shown, in some embodiments, the test system further includes a temperature patrol meter 15, which can simultaneously measure the temperature of the pyrolysis chamber 11 at all temperature measurement points 14, thereby simplifying the overall temperature measurement structure.

[0070] It can be understood that, in combination with the above structure, through the cooperation of multiple temperature measuring points 14 and temperature patrol meters 15, the temperature of each part of the pyrolysis chamber 11 can be monitored in real time, which is conducive to achieving refined control of the temperature of the pyrolysis chamber 11, obtaining high-value pyrolysis products, and further reducing the energy consumption of the pyrolysis process.

[0071] like Figure 1 As shown, in some embodiments, the rotary kiln 1 is further provided with a gas inlet 16 communicating with the pyrolysis chamber 11 .

[0072] The test system further includes a steam generator 7 and a first steam pipe 71 . The steam generator 7 is provided with a first steam outlet 72 . The first steam outlet 72 , the first steam pipe 71 and the gas inlet 16 are sequentially connected to provide activation steam to the pyrolysis chamber 11 .

[0073] It can be understood that with the assistance of the high-temperature electric heating furnace 6 heating the pyrolysis chamber 11 and the steam generator 7 providing activated steam to the pyrolysis chamber 11 , pyrolysis of the waste tire particles in the pyrolysis chamber 11 can be achieved.

[0074] like Figure 1 As shown, in some embodiments, the test system also includes a steam buffer bottle 73, a first regulating valve 74 and a first flow meter 75, and the first steam pipe 71 is provided with a steam buffer bottle 73, a first regulating valve 74 and a first flow meter 75 in sequence. In other words, the first steam pipe 71 is connected in series with a steam buffer bottle 73, a first regulating valve 74 and a first flow meter 75.

[0075] It can be understood that the steam buffer bottle 73 can maintain the stability of the activated steam, and the first regulating valve 74 and the first flow meter 75 can be used in conjunction to accurately control the flow of the activated steam in the first steam pipe 71, so as to flexibly adjust the amount of activated gas introduced during the pyrolysis process, thereby changing the pyrolysis reaction conditions.

[0076] like Figure 1 As shown, in some embodiments, the steam generator 7 is further provided with a second steam outlet 76 .

[0077] The test system also includes a second steam pipe 77 and a second regulating valve 78 . The second steam outlet 76 , the second steam pipe 77 and the steam inlet of the primary condenser 31 are connected in sequence to provide cooling steam to the primary condenser 31 . The second steam pipe 77 is provided with a second regulating valve 78 .

[0078] It can be understood that, in combination with the above structure, one path of steam from the steam generator 7 enters the pyrolysis chamber 11 as an activation gas, and the other path of steam enters the primary condenser 31 as a cooling medium, which can further simplify the overall structure of the test system and has a high degree of integration. At the same time, the second regulating valve 78 can control the flow of cooling steam entering the primary condenser 31, so as to ensure the cooling performance of the primary condenser 31 according to the actual cooling working conditions.

[0079] Specifically, the second regulating valve 78 can simultaneously perform three functions: regulating, cooling, and reducing pressure. This reduces the temperature and pressure of the steam in the second steam pipe 77, allowing the cooling steam entering the primary condenser 31 to cool and separate the oil-gas mixture into high-flashpoint pyrolysis oil and intermediate products. In this case, the cooling medium in the primary condenser 31 is water vapor, while the cooling medium in the secondary condenser 33 can be dry ice.

[0080] like Figure 1 As shown, in some embodiments, the scrubbing device 4 includes an alcohol absorption tank 41 and an alkali liquid absorption tank 42, and the pyrolysis gas outlet of the secondary condenser 33, the alcohol absorption tank 41, the alkali liquid absorption tank 42 and the gas collecting bag 5 are connected in sequence to ensure the impurity removal effect of the pyrolysis gas by the two-stage scrubbing operation.

[0081] like Figure 1 As shown, in some embodiments, the rotary kiln 1 is further provided with a gas inlet 16 connected to the pyrolysis chamber 11 , and the test system further includes a nitrogen gas cylinder group 8 , a gas supply pipeline 81 , a third regulating valve 82 and a second flow meter 83 .

[0082] The nitrogen cylinder group 8 , the gas supply pipeline 81 and the gas inlet 16 are sequentially connected to purge the residual air in the gas supply pipeline 81 and the pyrolysis chamber 11 .

[0083] The gas supply pipeline 81 is provided with a third regulating valve 82 and a second flow meter 83 .

[0084] It can be understood that the nitrogen cylinder group 8 and the gas supply pipeline 81 form a nitrogen purge system, so that the nitrogen purge system can maintain an inert atmosphere in the entire test system. At the same time, the third regulating valve 82 and the second flowmeter 83 cooperate to accurately control the flow rate of nitrogen in the gas supply pipeline 81, so as to study the effect of different carrier gas flow rates of the nitrogen cylinder group 8 on the characteristics of the waste tire particle pyrolysis products.

[0085] like Figure 2As shown, a method for testing the pyrolysis characteristics of waste tires according to an embodiment of the present invention includes the following steps:

[0086] Step S1, pyrolysis, placing waste tire particles in the pyrolysis chamber 11 of the rotary kiln 1 for pyrolysis to obtain pyrolysis coke and oil-gas mixture;

[0087] Step S2, collecting the pyrolysis coke and separating the oil-gas mixture, allowing the pyrolysis coke to enter the pyrolysis coke collector 2 for storage, and passing the oil-gas mixture into the primary condenser 31 for cooling and separation to obtain high-flash-point pyrolysis oil and intermediate products, which are then passed into the high-flash-point oil storage tank 32 for storage. The intermediate products are further passed into the secondary condenser 33 for cooling and separation to obtain low-flash-point pyrolysis oil and pyrolysis gas, which are then passed into the low-flash-point oil storage tank 34 for storage;

[0088] Step S3, collecting the pyrolysis gas, passing the pyrolysis gas into the scrubber 4 for scrubbing to obtain purified pyrolysis gas, and storing the purified pyrolysis gas in the gas collection bag 5;

[0089] Step S4, determining process parameters, analyzing the effects of different reaction conditions on pyrolysis coke, pyrolysis oil and pyrolysis gas, and determining the optimal process parameters for waste tire pyrolysis.

[0090] The technical advantages of the waste tire pyrolysis characteristics testing method according to the embodiment of the present invention are the same as the technical advantages of the waste tire pyrolysis characteristics testing system described above, and will not be repeated here.

[0091] In some embodiments, in step S1, the particle size of the waste tire particles is 2.5 mm-7.0 mm, wherein the particle size of the waste tire particles can be, for example, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, etc., but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0092] In step S1, the rotation speed of the rotary kiln 1 is r, and r is 0.2 rpm-2.0 rpm, where r can be, for example, 0.2 rpm, 0.4 rpm, 0.6 rpm, 0.8 rpm, 1.0 rpm, 1.2 rpm, 1.4 rpm, 1.6 rpm, 1.8 rpm, 2.0 rpm, etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0093] In step S1, the residence time of the waste tire particles in the pyrolysis chamber 11 is t, and t is 30 min-60 min. For example, t can be 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, etc., but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0094] In step S1, the final pyrolysis temperature of the waste tire particles in the pyrolysis chamber 11 is T, and T is 400°C-700°C. T can be, for example, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C, 700°C, etc., but is not limited to the listed values. Other values ​​not listed within this numerical range are also applicable.

[0095] In step S1, the heating rate of the high-temperature electric heating furnace 6 is δ, and δ is 10℃ / min-40℃ / min. δ can be, for example, 10℃ / min, 15℃ / min, 20℃ / min, 25℃ / min, 30℃ / min, 35℃ / min, 40℃ / min, etc., but is not limited to the listed values. Other values ​​not listed within this numerical range are also applicable.

[0096] In some embodiments, the flash point of the high flash point pyrolysis oil is F1, and F1>60°C.

[0097] The flash point of low flash point pyrolysis oil is F2, and F2 is 10°C-20°C. F2 can be, for example, 10°C, 12°C, 14°C, 16°C, 18°C, 20°C, etc., but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0098] like Figure 2 As shown, in some embodiments, before step S1, the testing method further includes the steps of:

[0099] Step S1', nitrogen purging, nitrogen is introduced into the pyrolysis chamber 11 from the nitrogen cylinder group 8 to purge and remove residual air, so that the pyrolysis chamber 11 is in an inert atmosphere;

[0100] Step S1″, steam activation, the steam generator 7 introduces activation steam into the pyrolysis chamber 11.

[0101] Therefore, in some embodiments of the present invention, the method for testing the pyrolysis characteristics of waste tires includes steps S1, S2, S3, and S4; in other embodiments, the method for testing the pyrolysis characteristics of waste tires includes steps S1', S1", S1, S2, S3, and S4. In other words, the method for testing the pyrolysis characteristics of waste tires of the present invention can be the two aforementioned methods.

[0102] In some embodiments, in step S1', the carrier gas flow rate of nitrogen is 200 mL / min-800 mL / min, wherein the carrier gas flow rate of nitrogen can be, for example, 200 mL / min, 300 mL / min, 400 mL / min, 500 mL / min, 600 mL / min, 700 mL / min, 800 mL / min, etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0103] In some embodiments, the temperature of the activated steam is T1, and T1 is 800°C-1000°C, where T1 can be, for example, 800°C, 820°C, 840°C, 860°C, 880°C, 900°C, 920°C, 940°C, 960°C, 980°C, 1000°C, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0104] The flow rate of the activated steam is υ, and υ is 0.20 g / min-0.25 g / min, where υ can be, for example, 0.20 g / min, 0.21 g / min, 0.22 g / min, 0.23 g / min, 0.24 g / min, 0.25 g / min, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0105] In some embodiments, the steam generator 7 also passes cooling steam into the primary condenser 31, and the temperature of the cooling steam is T2, and T2 is 100℃-200℃, where T2 can be, for example, 100℃, 120℃, 140℃, 160℃, 180℃, 200℃, etc., but is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0106] It should be noted that the parameter range of the above reaction conditions is the high value range of waste tire pyrolysis products, but different waste tire materials have different target products, and the parameter settings of the reaction conditions are also different. The specific parameters can be determined through the test system of the present invention and will not be elaborated here.

[0107] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0109] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0110] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0111] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0112] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A waste tire pyrolysis characteristics testing system, characterized in that: include: A rotary kiln having a pyrolysis chamber and a pyrolysis coke outlet and an oil-gas mixture outlet communicating with the pyrolysis chamber, wherein the pyrolysis chamber is used to pyrolyze waste tire particles; a thermal decoking collector, the thermal decoking collector being in communication with the thermal decoking outlet; A pyrolysis oil collection unit, comprising a primary condenser, a high-flash-point oil storage tank, a secondary condenser, and a low-flash-point oil storage tank, wherein the oil-gas mixture outlet, the primary condenser, and the secondary condenser are sequentially connected, the pyrolysis oil outlet of the primary condenser is connected to the high-flash-point oil storage tank, and the pyrolysis oil outlet of the secondary condenser is connected to the low-flash-point oil storage tank; The gas washing device and the gas collecting bag are connected in sequence to the pyrolysis gas outlet of the secondary condenser, the gas washing device and the gas collecting bag. The gas collecting bag is used to store the pyrolysis gas after washing.

2. The waste tire pyrolysis characteristics testing system according to claim 1, characterized in that: The test system also includes a high-temperature electric heating furnace and a temperature controller. The high-temperature electric heating furnace is arranged in the rotary kiln and is used to heat the pyrolysis chamber. The high-temperature electric heating furnace includes a heating section, a pyrolysis section and a secondary reaction section arranged in sequence along the extension direction of the pyrolysis chamber. The temperature controller is electrically connected to the heating section, the pyrolysis section and the secondary reaction section respectively.

3. The waste tire pyrolysis characteristics testing system according to claim 1, characterized in that: The rotary kiln is also provided with a temperature measuring point, which is used to monitor the temperature of the pyrolysis chamber; There are multiple temperature measuring points, which are arranged at intervals along the extension direction of the pyrolysis chamber.

4. The waste tire pyrolysis characteristics testing system according to claim 1, characterized in that: The rotary kiln is further provided with a gas inlet connected to the pyrolysis chamber; The testing system further includes a steam generator and a first steam pipe. The steam generator is provided with a first steam outlet. The first steam outlet, the first steam pipe and the gas inlet are sequentially connected to provide activation steam to the pyrolysis chamber.

5. The waste tire pyrolysis characteristics testing system according to claim 4, characterized in that: It also includes a steam buffer bottle, a first regulating valve and a first flow meter. The steam buffer bottle, the first regulating valve and the first flow meter are sequentially arranged on the first steam pipeline.

6. The waste tire pyrolysis characteristics testing system according to claim 4, characterized in that: The steam generator is further provided with a second steam outlet; The test system also includes a second steam pipe and a second regulating valve. The second steam outlet, the second steam pipe and the steam inlet of the primary condenser are connected in sequence to provide cooling steam to the primary condenser. The second steam pipe is provided with the second regulating valve.

7. The waste tire pyrolysis characteristics testing system according to claim 1, characterized in that: The gas scrubber comprises an alcohol absorption tank and an alkali solution absorption tank, and the pyrolysis gas outlet of the secondary condenser, the alcohol absorption tank, the alkali solution absorption tank and the gas collecting bag are connected in sequence.

8. The waste tire pyrolysis characteristics testing system according to claim 1, characterized in that: The rotary kiln is further provided with a gas inlet connected to the pyrolysis chamber, and the testing system further comprises: A nitrogen cylinder group and a gas supply pipeline, wherein the nitrogen cylinder group, the gas supply pipeline and the gas inlet are sequentially connected to purge the gas supply pipeline and residual air in the pyrolysis chamber; A third regulating valve and a second flow meter are provided on the gas supply pipeline.

9. A method for testing the pyrolysis characteristics of waste tires, characterized in that: The test method comprises the following steps: Pyrolysis: placing waste tire particles in the pyrolysis chamber of a rotary kiln for pyrolysis to obtain pyrolysis coke and oil-gas mixture; The pyrolysis coke is collected and the oil-gas mixture is separated, the pyrolysis coke is stored in the pyrolysis coke collector, and the oil-gas mixture is passed into a primary condenser for cooling and separation to obtain high-flash-point pyrolysis oil and intermediate products, the high-flash-point pyrolysis oil is stored in a high-flash-point oil storage tank, and the intermediate products are further passed into a secondary condenser for cooling and separation to obtain low-flash-point pyrolysis oil and pyrolysis gas, and the low-flash-point pyrolysis oil is stored in a low-flash-point oil storage tank; Pyrolysis gas is collected and passed through a gas scrubber to obtain purified pyrolysis gas, which is then stored in a gas collection bag; The process parameters are determined, the effects of different reaction conditions on pyrolysis coke, pyrolysis oil and pyrolysis gas are analyzed, and the optimal process parameters for waste tire pyrolysis are determined.

10. The method for testing the pyrolysis characteristics of waste tires according to claim 9, wherein: Prior to the pyrolysis operation, the test method further comprises the steps of: Nitrogen purging: nitrogen is introduced into the pyrolysis chamber from a nitrogen cylinder assembly to purge and remove residual air, so that the pyrolysis chamber is in an inert atmosphere; Steam activation: Activated steam is introduced into the pyrolysis chamber from a steam generator.

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