Microwave pyrolysis experimental device

Abstract

The utility model relates to the technical field of microwave pyrolysis, and discloses a microwave pyrolysis experimental device which comprises a microwave reaction furnace, a slope sample table is arranged in the microwave reaction furnace, and the top end of the slope sample table is fixedly connected with a single-opening quartz tube. In the process that pyrolysis gas flows along the open end of the single-opening quartz tube, most pyrolysis gas can be condensed into liquid tar and water in the reactor, the open end of the single-opening quartz tube inclines downwards, most condensed liquid is collected by the tar collecting bottle arranged at the open end of the single-opening quartz tube, and the condensed liquid cannot flow back to a reaction high-temperature area of the reactor; according to the utility model, secondary cracking of tar is avoided, residual uncondensed mixed gas enters the condenser, the V-shaped condensing pipeline is adopted, and the inclined condensing pipe is straight and flat, so that the tar can flow downwards along the wall after being condensed, and finally is enriched to flow to a tar collecting bottle, the tar yield is improved, and the tar collecting device is simple and convenient in pipeline connection, simple in operation, high in safety coefficient and easy to realize and popularize.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave pyrolysis, in particular to a microwave pyrolysis experimental device. Background Art

[0002] Microwave pyrolysis technology is a common heating technology because of its uniform heating and fast heating. In the experiment, the raw material is heated rapidly as a whole in the electromagnetic field due to dielectric loss. Taking low-metamorphic coal as an example, three physical phase products are often generated: solid residue, liquid tar, and pyrolysis gas. In the many years of research on microwave pyrolysis technology, the effective separation of the three forms of products has always been the focus of scientific researchers. Due to the difficulty in separating tar from solid residue and pyrolysis gas, the tar yield is low, the liquid tar remains in the solid residue for secondary pyrolysis, etc., which reduces the tar yield.

[0003] Therefore, in order to effectively improve the current separation status of the three products, the utility model discloses a microwave pyrolysis experimental device, which is simple to operate, has a high reaction safety factor, and effectively improves the tar yield. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a microwave pyrolysis experimental device, which has the advantages of strong operability, high safety factor and thorough tar separation, and solves the problems raised in the background technology.

[0005] The utility model provides the following technical scheme: a microwave pyrolysis experimental device, comprising a microwave reaction furnace, wherein a slope sample stage is arranged in the microwave reaction furnace, a single-opening quartz tube is fixedly connected to the top of the slope sample stage, a tar collecting bottle is fixedly connected to the bottom opening of the single-opening quartz tube, an atmosphere reserved port is fixedly connected to the top opening of the single-opening quartz tube, a condenser is arranged on one side of the microwave reaction furnace, a condenser water tank is arranged inside the condenser, a plurality of groups of V-shaped condensation pipelines are arranged inside the condenser water tank, an inclined condensation tube is fixedly connected to the bottom end of the V-shaped condensation pipeline, one end of the inclined condensation tube passes through the side wall of the condenser water tank and extends to the outside of the condenser, a surface of the inclined condensation tube is connected to the open end of the single-opening quartz tube through a connecting pipeline, a tar collecting bottle is fixedly connected to the bottom end of the inclined condensation tube, a water washing bottle is fixedly connected to the top of the inclined condensation tube through a pipeline, a drying bottle is fixedly connected to the top of the drying bottle through a pipeline, and a gas collecting bag is fixedly connected to the top of the inclined condensation tube through a pipeline.

[0006] Preferably, the slope on the sloped sample stage is higher inside and lower outside, and the inclination angle is 8° to 15°. A K-type thermocouple is embedded inside the sloped sample stage to monitor the temperature of the sealed end of the single-opening quartz tube. The angle of the sloped sample stage is adjustable.

[0007] Preferably, the V-shaped condensation pipeline has a pipeline angle of 30°, the angle opening faces downward, and is arranged in four connected groups, and three special stop valves are provided between the inclined condensation tubes at the bottom ends of the four groups of V-shaped condensation pipelines.

[0008] Preferably, the pipeline angle of the inclined condenser is 15°, and its position is lower on the left and higher on the right. Two stop valves are provided at the left bottom end of the inclined condenser, and the stop valves are located outside the condenser.

[0009] Preferably, a condensate outlet is fixedly connected to the top of the condenser, and a condensate inlet is fixedly connected to the bottom of the condenser.

[0010] Preferably, room temperature deionized water is placed inside the water washing bottle, silica gel drying particles are placed inside the drying bottle, and the condenser is made of quartz.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. During the flow of pyrolysis gas along the open end of the single-opening quartz tube, most of the pyrolysis gas can condense into liquid tar and water in the reactor. Since the open end of the single-opening quartz tube is tilted downward, the tar collection bottle set here collects most of the condensed liquid and will not flow back to the high-temperature reaction zone of the reactor, thus avoiding the secondary cracking of the tar. Combined with the thermocouple set on the support table, the temperature of the high-temperature reaction zone of the pyrolysis sample can be accurately controlled.

[0013] 2. The remaining uncondensed mixed gas enters the condenser, using a V-shaped condensation pipeline, and the inclined condenser tube is straight and flat, which is conducive to the tar flowing down along the wall after condensation, and finally enriched and flowing to the tar collection bottle, thereby improving the tar recovery rate;

[0014] 3. The utility model has simple pipeline connection, simple operation, high safety factor and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the microwave pyrolysis device of the utility model.

[0016] In the figure: 1. Microwave reactor; 2. Single-opening quartz tube; 3. Sloped sample table; 4. Atmosphere reserved port; 5. Connecting pipeline; 6. Tar collection bottle; 7. Condenser; 8. V-shaped condensation pipeline; 9. Stop valve; 10. Condensate inlet; 11. Special stop valve; 12. Inclined condenser tube; 13. Condensate outlet; 14. Condenser water tank; 15. Washing bottle; 16. Drying bottle; 17. Gas collecting bag. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Reference Figure 1 A microwave pyrolysis experimental device comprises a microwave reaction furnace 1, a slope sample platform 3 is arranged in the microwave reaction furnace 1, a single-opening quartz tube 2 is fixedly connected to the top of the slope sample platform 3, a tar collection bottle 6 is fixedly connected to the bottom opening of the single-opening quartz tube 2, an atmosphere reservation port 4 is fixedly connected to the top opening of the single-opening quartz tube 2, a condenser 7 is arranged on one side of the microwave reaction furnace 1, a condenser water tank 14 is arranged inside the condenser 7, a plurality of groups of V-shaped condensation pipelines 8 are arranged inside the condenser water tank 14, and the bottom end of the V-shaped condensation pipeline 8 is fixedly connected to the condenser water tank 14. An inclined condenser 12 is fixedly connected, one end of which passes through the side wall of the condenser water tank 14 and extends to the outside of the condenser 7. The surface of the inclined condenser 12 is connected to the open end of the single-opening quartz tube 2 through a connecting pipe 5. The bottom end of the inclined condenser 12 is fixedly connected to a tar collecting bottle 6, the top end of the inclined condenser 12 is fixedly connected to a water washing bottle 15 through a pipe, the top end of the water washing bottle 15 is fixedly connected to a drying bottle 16 through a pipe, and the top end of the drying bottle 16 is fixedly connected to an air collecting bag 17 through a pipe, so as to achieve a benign separation of tar and pyrolysis gas.

[0019] Among them, the slope on the slope sample stage 3 is set to be high inside and low outside, and the inclination angle is 8°~15°. A K-type thermocouple is embedded in the interior of the slope sample stage 3 to monitor the temperature of the sealed end of the single-opening quartz tube 2. The angle of the slope sample stage 3 is adjustable. Its purpose is to allow the condensed tar in the single-opening quartz tube 2 to flow out and be collected smoothly. The inclination angle of the slope sample stage 3 should not be too large or too small. If it is too small, it is difficult to effectively flow out the liquid tar, and if it is too large, it is easy to cause the sample in the single-opening quartz tube 2 to slip.

[0020] Among them, the pipeline angle of the V-shaped condensation pipeline 8 is 30°, the angle opening faces downward, and is arranged in four connected groups. Three special stop valves 11 are arranged between the inclined condensation tubes 12 at the bottom ends of the four groups of V-shaped condensation pipelines 8. The set special stop valves 11 are connected to the condenser 7 as a whole. While keeping the inclined condensation tubes 12 cut off, it is necessary to ensure good connection with the condenser 7 to prevent the leakage of condensate.

[0021] Among them, the pipeline angle of the inclined condenser 12 is 15°, which is the optimal angle adjusted after repeated trials of the condenser 7. Its position is low on the left and high on the right. Two stop valves 9 are provided at the left bottom end of the inclined condenser 12, and the stop valves 9 are located outside the condenser 7.

[0022] The top of the condenser 7 is fixedly connected with a condensed water outlet 13 , and the bottom of the condenser 7 is fixedly connected with a condensed water inlet 10 .

[0023] The washing bottle 15 contains deionized water at room temperature, the drying bottle 16 contains silica gel drying particles, and the condenser 7 is made of quartz.

[0024] Working principle: place the pyrolysis raw material at the bottom of a single-open quartz tube 2 sealed at one end, and place it on an 8° slope sample table 3 in a microwave reaction furnace 1, extend the open end of the single-open quartz tube 2 beyond the furnace by 80 mm, seal the open end of the single-open quartz tube 2 with a plug and connect it to the inlet of a condenser 7, connect a washing bottle 15, a drying bottle 16, and an air collecting bag 17 in sequence at the outlet of the condenser 7, connect the lower opening to a tar collection bottle 6, seal the reserved opening of the tar collection bottle 6 with a plug, seal the atmosphere reserved opening 4 of the single-open quartz tube 2 with a plug, and then connect two stop valves 9 to the outlet of the inclined condenser tube 12 in the condenser 7 and then connect it to the tar collection bottle 6. , condensate is introduced from the condensate inlet 10 of the condenser 7. After checking the air tightness of the connected device, the microwave reactor 1 with the parameters set is opened to start the experiment. During the experimental reaction, the change of the tar amount at the stop valve 9 in the inclined condenser tube 12 in the condenser 7 is continuously observed. After the condensed tar is enriched, the stop valve 9 is opened. After the tar flows to the next stop valve 9, the stop valve 9 is immediately closed. The operation is carried out from right to left in sequence until the tar flows into the tar collecting bottle 6 at the opening of the inclined condenser tube 12. After the reaction is completed, the power supply, condensate, etc. are turned off, and all the tar in the tar collecting bottle 6 and the gas in the gas collecting bag 17 can be retained for standby use to complete the microwave pyrolysis experiment.

[0025] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A microwave pyrolysis experimental device, characterized in that: The invention comprises a microwave reaction furnace (1), wherein a slope sample stage (3) is arranged inside the microwave reaction furnace (1), a single-opening quartz tube (2) is fixedly connected to the top of the slope sample stage (3), a tar collection bottle (6) is fixedly connected to the bottom opening of the single-opening quartz tube (2), an atmosphere reservation port (4) is fixedly connected to the top opening of the single-opening quartz tube (2), a condenser (7) is arranged on one side of the microwave reaction furnace (1), a condenser water tank (14) is arranged inside the condenser (7), a plurality of groups of V-shaped condensation pipelines (8) are arranged inside the condenser water tank (14), and the V-shaped condensation pipelines (8) are fixedly connected to the bottom opening of the single-opening quartz tube (2). The bottom end of the inclined condenser (12) is fixedly connected to an inclined condenser tube (12), one end of which passes through the side wall of the condenser water tank (14) and extends to the outside of the condenser (7), the surface of the inclined condenser tube (12) is connected to the open end of the single-opening quartz tube (2) via a connecting pipe (5), the bottom end of the inclined condenser tube (12) is fixedly connected to a tar collection bottle (6), the top end of the inclined condenser tube (12) is fixedly connected to a water washing bottle (15) via a pipe, the top end of the water washing bottle (15) is fixedly connected to a drying bottle (16) via a pipe, and the top end of the drying bottle (16) is fixedly connected to an air collecting bag (17) via a pipe.

2. A microwave pyrolysis experimental device according to claim 1, characterized in that: The slope on the slope sample stage (3) is arranged to be higher inside and lower outside, and the inclination angle is 8° to 15°. A K-type thermocouple is embedded inside the slope sample stage (3) for monitoring the temperature of the sealed end of the single-opening quartz tube (2). The angle of the slope sample stage (3) is adjustable.

3. A microwave pyrolysis experimental device according to claim 1, characterized in that: The V-shaped condensation pipeline (8) has a pipeline angle of 30°, with its opening facing downward, and is arranged in four connected groups. Three special stop valves (11) are provided between the inclined condensation pipes (12) at the bottom ends of the four groups of V-shaped condensation pipelines (8).

4. A microwave pyrolysis experimental device according to claim 1, characterized in that: The pipeline angle of the inclined condenser (12) is 15°, and its position is lower on the left and higher on the right. Two stop valves (9) are provided at the left bottom end of the inclined condenser (12), and the stop valves (9) are located outside the condenser (7).

5. The microwave pyrolysis experimental device according to claim 1, characterized in that: The top of the condenser (7) is fixedly connected with a condensed water outlet (13), and the bottom of the condenser (7) is fixedly connected with a condensed water inlet (10).

6. A microwave pyrolysis experimental device according to claim 1, characterized in that: Normal temperature deionized water is placed inside the water washing bottle (15), silica gel drying particles are placed inside the drying bottle (16), and the condenser (7) is made of quartz.

Images