Waste recovery device and cold hydrogenation system

Abstract

The utility model provides a waste recovery device and a cold hydrogenation system. The device comprises a heater, a first buffer tank, a first receiving tank, a second receiving tank and a second buffer tank, an outlet of the heater is communicated with a top inlet of the stock bin, a bottom outlet of the stock bin, a feeding port of the first receiving tank and a feeding port of the second receiving tank, the top outlet of the stock bin is communicated with a feeding port of the first buffer tank, and a discharging port of the first buffer tank is communicated with the feeding port of the first receiving tank. A discharge port of the first receiving tank is respectively communicated with a feed port of the second receiving tank and a feed port of the second buffer tank, and a discharge port of the second receiving tank is communicated with a feed port of the second buffer tank; a feed port of the first receiving tank is communicated with a discharge port of the cyclone separator, and a feed port of the second receiving tank is communicated with a discharge port of the first filter. A user can recover solid waste particles gathered in the cyclone separator and the first filter by applying the solid waste recovery device, and the waste recovery rate is improved.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of polysilicon production, and in particular to a waste recovery device and a cold hydrogenation system. Background Art

[0002] With the development of new energy, semiconductor and other industries, the demand for silicon wafers is becoming increasingly strong, and the production of silicon wafers requires polysilicon.

[0003] In the production process of polysilicon, the cold hydrogenation process is often involved. The cold hydrogenation process is to pass hydrogen, silicon powder, silicon tetrachloride and other raw materials into a fluidized bed reactor for reaction to generate trichlorosilane, and trichlorosilane with higher purity can be obtained through processes such as distillation.

[0004] Under the cold hydrogenation process, the existing waste recovery devices have the problem of low waste recovery rate. Utility Model Content

[0005] The embodiments of the utility model provide a waste recovery device and a cold hydrogenation system to solve the problem of low waste recovery rate in the existing waste recovery device under the cold hydrogenation process.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] In a first aspect, an embodiment of the utility model provides a waste recovery device, wherein a cold hydrogenation system comprises: a silo, a fluidized bed reactor, a cyclone separator, and a first filter; the bottom outlet of the silo is connected to the feed inlet of the fluidized bed reactor, the discharge port of the fluidized bed reactor is connected to the inlet of the cyclone separator, and the outlet of the cyclone separator is connected to the inlet of the first filter;

[0008] The waste recycling device comprises: a heater, a first buffer tank, a first receiving tank, a second receiving tank, and a second buffer tank;

[0009] The outlet of the heater is respectively connected with the top inlet of the silo, the bottom outlet of the silo, the feed port of the first receiving tank, and the feed port of the second receiving tank; the top outlet of the silo is connected with the feed port of the first buffer tank; the discharge port of the first buffer tank is connected with the feed port of the first receiving tank; the discharge port of the first receiving tank is respectively connected with the feed port of the second receiving tank and the feed port of the second buffer tank; the discharge port of the second receiving tank is connected with the feed port of the second buffer tank;

[0010] The feed inlet of the first receiving tank is communicated with the discharge port of the cyclone separator, and the feed inlet of the second receiving tank is communicated with the discharge port of the first filter.

[0011] Optionally, it also includes:

[0012] The elution tower, the outlet of the second buffer tank is connected to the feed inlet of the elution tower.

[0013] Optionally, it also includes:

[0014] a steam generating device, wherein a steam outlet of the steam generating device is in communication with an inlet of the heater;

[0015] A hydrogen gas source, wherein the gas outlet of the hydrogen gas source is communicated with the inlet of the heater.

[0016] Optionally,

[0017] The discharge port of the first buffer tank is communicated with the feed port of the second buffer tank.

[0018] Optionally,

[0019] The discharge port of the first buffer tank is communicated with the feed port of the second receiving tank.

[0020] Optionally, it also includes:

[0021] A second filter, wherein the inlet of the second filter is communicated with the top outlet of the silo, and the outlet of the second filter is communicated with the feed inlet of the first buffer tank.

[0022] Optionally, it also includes:

[0023] The third filter, the discharge port of the first receiving tank is communicated with the inlet of the third filter, and the outlet of the third filter is communicated with the feed port of the second buffer tank.

[0024] Optionally, it also includes:

[0025] The fourth filter, the discharge port of the second receiving tank is communicated with the inlet of the fourth filter, and the outlet of the fourth filter is communicated with the inlet of the second buffer tank.

[0026] Optionally, it also includes:

[0027] A waste storage tank, wherein the bottom waste discharge port of the first receiving tank is connected to the feed port of the waste storage tank.

[0028] In the second aspect, an embodiment of the utility model provides a cold hydrogenation system, comprising: a silo, a fluidized bed reactor, a cyclone separator, and a first filter; the bottom outlet of the silo is connected to the feed inlet of the fluidized bed reactor, the discharge port of the fluidized bed reactor is connected to the inlet of the cyclone separator, the outlet of the cyclone separator is connected to the inlet of the first filter, and the cold hydrogenation system also includes a waste recovery device as described in any one of the first aspects.

[0029] In an embodiment of the utility model, the cold hydrogenation system includes: a silo, a fluidized bed reactor, a cyclone separator, and a first filter; the bottom outlet of the silo is connected to the feed inlet of the fluidized bed reactor, and the discharge port of the fluidized bed reactor is connected to the inlet of the cyclone separator; the waste recovery device includes: a heater, a first buffer tank, a first receiving tank, a second receiving tank, and a second buffer tank; the outlet of the heater is connected to the top inlet of the silo, the bottom outlet of the silo, the feed inlet of the first receiving tank, and the feed inlet of the second receiving tank, respectively; the top outlet of the silo is connected to the feed inlet of the first buffer tank, the discharge port of the first buffer tank is connected to the feed inlet of the first receiving tank, the discharge port of the first receiving tank is connected to the feed inlet of the second receiving tank and the feed inlet of the second buffer tank, respectively, and the discharge port of the second receiving tank is connected to the feed inlet of the second buffer tank; the feed inlet of the first receiving tank is connected to the discharge port of the cyclone separator, and the feed inlet of the second receiving tank is connected to the discharge port of the first filter. By applying the waste recovery device of the embodiment of the utility model, users can recover the solid waste particles accumulated in the cyclone separator and the first filter, thereby improving the waste recovery rate of the cold hydrogenation system and enhancing resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the pipeline connection structure of the waste recovery device according to an embodiment of the utility model;

[0032] in:

[0033] 1. Silo; 2. Heater; 3. Second filter; 4. First buffer tank; 5. Cyclone separator; 6. First receiving tank; 7. Second buffer tank; 8. elution tower; 10. Second receiving tank; 11. First filter; 12. Fourth filter; 13. Third filter;

[0034] 110-121, regulating valve;

[0035] 21-24. Shut-off valve. DETAILED DESCRIPTION

[0036] 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 part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0037] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0038] In the technical solution of the present disclosure, words such as “connect”, “couple” or “connected” are not limited to physical or mechanical connections, but may include electrical connections.

[0039] See also Figure 1 As shown, the cold hydrogenation system includes: a silo 1, a fluidized bed reactor (not shown in the figure), a cyclone separator 5, and a first filter 11; the bottom outlet of the silo 1 is connected to the feed inlet of the fluidized bed reactor (not shown in the figure), the discharge port of the fluidized bed reactor (not shown in the figure) is connected to the inlet of the cyclone separator 5, and the outlet of the cyclone separator 5 is connected to the inlet of the first filter 11; the silo 1 is used to store silicon powder. In the actual production process, hydrogen is introduced to increase the gas pressure in the silo 1, and the silicon powder is discharged from the silo 1 into the fluidized bed reactor (not shown in the figure) for reaction.

[0040] It should be noted that the discharge port of the fluidized bed reactor (not shown in the figure) is connected to the inlet of the cyclone separator 5, and the outlet of the cyclone separator 5 is connected to the inlet of the first filter 11; the cyclone separator 5 operates to separate the exhaust gas and solid waste particles discharged from the fluidized bed reactor (not shown in the figure). In practical applications, the cyclone separator 5 can separate solid waste particles with a particle size of 10-20 microns in the exhaust gas. After the exhaust gas passes through the cyclone separator 5, it enters the first filter 11, and the exhaust gas is separated again by the first filter 11. In practical applications, the first filter 11 can separate solid waste particles with a particle size of less than 10 microns in the exhaust gas.

[0041] As the reaction proceeds for a long time, a large amount of solid waste particles gradually accumulate in the cyclone separator 5 and the first filter 11. Existing waste recovery devices often ignore the recovery of solid waste particles accumulated in the cyclone separator 5 and the first filter 11 in the cold hydrogenation system, resulting in a low waste recovery rate.

[0042] Based on this, the present invention provides a waste recycling device. Figure 1 As shown, the waste recycling device includes: a heater 2, a first buffer tank 4, a first receiving tank 6, a second receiving tank 10, and a second buffer tank 7;

[0043] The outlet of the heater 2 is respectively connected with the top inlet of the silo 1, the bottom outlet of the silo 1, the feed port of the first receiving tank 6, and the feed port of the second receiving tank 10; the top outlet of the silo 1 is connected with the feed port of the first buffer tank 4; the discharge port of the first buffer tank 4 is connected with the feed port of the first receiving tank 6; the discharge port of the first receiving tank 6 is respectively connected with the feed port of the second receiving tank 10 and the feed port of the second buffer tank 7; the discharge port of the second receiving tank 10 is connected with the feed port of the second buffer tank 7;

[0044] The feed inlet of the first receiving tank 6 is communicated with the discharge port of the cyclone separator 5 , and the feed inlet of the second receiving tank 10 is communicated with the discharge port of the first filter 11 .

[0045] In some embodiments of the utility model, the communication mode between the devices includes communication through pipelines. A valve is provided on each pipeline, so that the user can control the connection and disconnection between the devices by switching the valve, and the user can adjust the air flow through each device by controlling the opening of the valve. The valve includes at least: a regulating valve and a cut-off valve.

[0046] In the embodiment of the utility model, the feed port of the first receiving tank 6 is connected to the discharge port of the cyclone separator 5, and the first receiving tank 6 is used to receive the solid waste particles accumulated during the separation process of the cyclone separator. The feed port of the second receiving tank 10 is connected to the discharge port of the first filter 11, and the second receiving tank 10 is used to receive the solid waste particles accumulated during the continuous filtering process of the first filter 11. With the embodiment of the utility model, the user can pass the hydrogen heated by the heater 2 into the first receiving tank 6 and / or the second receiving tank 10 to bring the solid waste particles out to the second buffer tank 7. Specifically, see Figure 1 As shown, the user operates the regulating valve 113 to open, and the hydrogen heated by the heater 2 enters the first receiving tank 6 through the pipeline 1.2 and the pipeline 1.6 in sequence; the user operates the regulating valve 114 to open, and the hydrogen heated by the heater 2 enters the second receiving tank 10 through the pipeline 1.2, the pipeline 1.6 and the pipeline 1.7 in sequence.

[0047] The following is an explanation with specific user operation examples:

[0048] Need to push material from silo 1 (corresponding to Figure 1 As shown, when the silicon powder in the silo 1 is transported from the conveying pipe 2.4 at the bottom of the silo 1 to the fluidized bed reactor (not shown in the figure), the user operates the regulating valve 111 to open, and the heated hydrogen pushes the silicon powder discharged from the silo 1 to be transported to the fluidized bed reactor (not shown in the figure) through the conveying pipe 2.4. During the pushing process, the user can control the temperature and the regulating valve cascade operation to achieve that the hydrogen temperature at the outlet of the heater 2 is approximately maintained at 180°C. Compared with the existing solution using cold hydrogen, the temperature of the hydrogen in the hydrogen pipe 1.3 with the material is increased, and the temperature of the silicon powder and the temperature of the hydrogen entering the fluidized bed reactor (not shown in the figure) are increased.

[0049] When it is necessary to discharge the solid waste particles collected in the first receiving tank 6 and the second receiving tank 10, the user can operate the regulating valve 113 and the regulating valve 114 to open, and the heated hydrogen is transported to the first receiving tank 6 through the pipeline 1.6, and the hydrogen heated by the heater 2 enters the first receiving tank 6 through the pipeline 1.2 and the pipeline 1.6 in turn; the hydrogen heated by the heater 2 enters the second receiving tank 10 through the pipeline 1.2, the pipeline 1.6 and the pipeline 1.7 in turn, and takes the solid waste particles out to the second buffer tank 7. In this process, the use of hydrogen heated by the heater 2 is conducive to reducing the power consumption required for the insulation of the first receiving tank 6 and the second receiving tank 10 (in the actual production process, the first receiving tank 6 needs to be insulated by a heating device, and the second receiving tank 10 needs to be insulated by a heating device).

[0050] In the embodiment of the utility model, the cold hydrogenation system includes: a silo 1, a fluidized bed reactor (not shown in the figure), a cyclone separator 5, and a first filter 11; the bottom outlet of the silo 1 is connected to the feed inlet of the fluidized bed reactor (not shown in the figure), the discharge port of the fluidized bed reactor (not shown in the figure) is connected to the inlet of the cyclone separator 5, and the outlet of the cyclone separator 5 is connected to the inlet of the first filter 11; the waste recovery device includes: a heater 2, a first buffer tank 4, a first receiving tank 6, a second receiving tank 10, and a second buffer tank 7; the outlet of the heater 2 is connected to the top inlet of the silo 1, The bottom outlet of the silo 1, the feed port of the first receiving tank 6, and the feed port of the second receiving tank 10 are connected respectively, the top outlet of the silo 1 is connected to the feed port of the first buffer tank 4, the discharge port of the first buffer tank 4 is connected to the feed port of the first receiving tank 6, the discharge port of the first receiving tank 6 is connected to the feed port of the second receiving tank 10 and the feed port of the second buffer tank 7 respectively, the discharge port of the second receiving tank 10 is connected to the feed port of the second buffer tank 7; the feed port of the first receiving tank 6 is connected to the discharge port of the cyclone separator 5, and the feed port of the second receiving tank 10 is connected to the discharge port of the first filter 11. The user can use the waste recovery device of the embodiment of the utility model to recover the solid waste particles accumulated in the cyclone separator 5 and the first filter 11, improve the waste recovery rate of the cold hydrogenation system, and improve the resource utilization rate.

[0051] In some embodiments of the present invention, optionally, see Figure 1 As shown, the waste recycling device also includes:

[0052] The elution tower 8 , the outlet of the second buffer tank 7 is connected to the feed inlet of the elution tower 8 .

[0053] In order to further improve the recovery rate of solid waste particles, and purify the hydrogen carrying solid waste particles to recycle the hydrogen. The embodiment of the utility model sets a leaching tower 8 to purify the hydrogen discharged from the exhaust port of the second buffer tank 7. The solid waste particles mixed in the hydrogen are combined with the droplets of the leaching liquid sprayed in the leaching tower 8 to form mixed droplets. Since the weight of the mixed droplets is greater than the weight of the solid waste particles, the mixed droplets carry the solid waste particles and accelerate the fall, so as to separate the solid waste particles from the hydrogen. Actual measurements have proved that after the leaching tower 8 is set for separation, the content of mixed solid waste particles in the hydrogen is extremely low, which can meet the reuse requirements; the solid waste particles can also be effectively collected.

[0054] In some embodiments of the present invention, optionally, see Figure 1 As shown, the waste recycling device also includes:

[0055] A steam generating device (not shown in the figure), wherein the steam outlet of the steam generating device (not shown in the figure) is connected to the inlet of the heater 2;

[0056] A hydrogen gas source, wherein the gas outlet of the hydrogen gas source is communicated with the inlet of the heater 2.

[0057] In practical applications, the hydrogen connected by the hydrogen source often has an uneven flow problem, which makes the heater heat the hydrogen unevenly. Based on this, the embodiment of the utility model is provided with a steam generator (not shown in the figure) to slow down the fluctuation of hydrogen flow and avoid the problem of uneven heating of hydrogen by the heater 2 caused by the fluctuation of hydrogen flow. In practical applications, the user can set an airflow meter on the heater 2, and the user observes the reading of the airflow meter. According to the change of the reading of the airflow meter, the user adjusts the steam production of the steam generator to offset the fluctuation of hydrogen flow; or, according to the change of the reading of the airflow meter, the user adjusts the opening of the valve on the pipeline between the steam outlet and the inlet of the heater 2 to adjust the steam flow and offset the fluctuation of hydrogen flow.

[0058] In some embodiments of the present invention, optionally, see Figure 1 As shown, the discharge port of the first buffer tank 4 is connected to the feed port of the second buffer tank 7. In practical applications, the user can operate the cut-off valve 22 and the regulating valve 119 to open and transmit the hydrogen discharged from the first buffer tank 4 to the second buffer tank through the pipeline 3.2.

[0059] In some embodiments of the present invention, optionally, see Figure 1 As shown, the discharge port of the first buffer tank 4 is connected to the feed port of the second receiving tank 10. In practical applications, the user can operate the regulating valve 116 to open and transmit the hydrogen discharged from the first buffer tank 4 to the second receiving tank 10 through the pipeline 4.2.

[0060] In some embodiments of the present invention, optionally, see Figure 1 As shown, the waste recycling device further includes: a second filter 3, the inlet of the second filter 3 is connected to the top outlet of the silo 1, and the outlet of the second filter 3 is connected to the feed inlet of the first buffer tank 4. The second filter 3 can be used to filter the hydrogen discharged from the silo 1 and separate the silicon powder particles mixed in the hydrogen.

[0061] In some embodiments of the present invention, optionally, see Figure 1As shown, the waste recovery device further includes: a third filter 13, the discharge port of the first receiving tank 6 is communicated with the inlet of the third filter 13, and the outlet of the third filter 13 is communicated with the feed port of the second buffer tank 7. In actual application, when the user needs to discharge the solid waste particles collected in the first receiving tank 6, the regulating valve 113 can be operated to open, and hydrogen enters the first receiving tank 6 through the pipeline 1.2, the pipeline 1.6 and the pipeline 4.1 in sequence, and the first receiving tank 6 is filled with hydrogen. The hydrogen carries the solid waste particles through the third filter 13, and the third filter 13 filters the hydrogen carrying the solid waste particles.

[0062] In some embodiments of the present invention, optionally, see Figure 1 As shown, the waste recovery device further includes: a fourth filter 12, the discharge port of the second receiving tank 10 is communicated with the inlet of the fourth filter 12, and the outlet of the fourth filter 12 is communicated with the inlet of the second buffer tank 7. In actual application, when the user needs to discharge the solid waste particles collected in the second receiving tank 10, the regulating valve 114 can be operated to open, and the hydrogen enters the second receiving tank 10 through the pipeline 1.2, the pipeline 1.6, the pipeline 1.7 and the pipeline 4.2 in sequence, and the second receiving tank 10 is filled with hydrogen. The hydrogen carries the solid waste particles through the fourth filter 12, and the fourth filter 12 filters the hydrogen carrying the solid waste particles.

[0063] based on Figure 1 The connection mode shown can facilitate users to achieve various process uses by adjusting the on / off between various devices. The following describes various process uses in combination with specific user operation examples:

[0064] User operation scenario 1:

[0065] During the continuous pushing process of silo 1, the user can control the temperature and regulating valve 110 to achieve a stable hydrogen temperature of 180°C at the outlet of heater 2, which improves the hydrogen temperature of hydrogen pipeline 1.3 with materials compared with the traditional solution, and improves the temperature of silicon powder entering the fluidized bed (in the cold hydrogenation process, the silicon powder in silo 1 is output to the fluidized bed reactor) and hydrogen. The hydrogen enters silo 1 through silo charging pipeline 1.4 to achieve heat preservation of silicon powder in silo 1, avoiding the problems of cold hydrogen charging in the traditional solution causing the temperature of silicon powder to drop and silicon powder agglomeration to block the pushing pipeline. In addition, the heated hydrogen is transported to the first receiving tank 6 through pipeline 1.6, and the heated hydrogen is transported to the second receiving tank 10 through pipeline 1.7, reducing the power consumption required for the insulation of the first receiving tank 6 and the second receiving tank 10 (in the actual production process, the first receiving tank 6 and the second receiving tank 10 need to be insulated by heating equipment).

[0066] User operation scenario 2:

[0067] During the process of depressurizing silo 1 (i.e., discharging the gas in silo 1 to reduce the gas pressure in silo 1), and when the first receiving tank 6 and the second receiving tank 10 do not need to be pressurized temporarily, the shut-off valve 21 on the silo 1 vent filter pipeline 3.1 is opened, and the hydrogen in silo 1 is discharged into the first buffer tank 4. The shut-off valve 21 is closed when the pressure is released until the gas pressures of silo 1 and the first buffer tank 4 are roughly equal. Then, the regulating valve 119 on pipeline 3.2 is opened, and the regulating valve 121 on pipeline 9.1 is opened. The pressure cascade control enters the elution tower 8 and is always not higher than 0.1MPa. The pressure of silo 1 is depressurized to below 0.1MPa, and the unloading operation is carried out (unloading, i.e., adding silicon powder to silo 1; before unloading, due to the high gas pressure in silo 1 during the pushing process, the silo 1 needs to be depressurized).

[0068] User operation scenario three:

[0069] During the depressurization process of the silo 1, if one of the first receiving tank 6 and the second receiving tank 10 needs to be pressurized, the user performs the following operations:

[0070] Open the shut-off valve 21 on the filter pipe 3.1 of the silo 1, open the regulating valve 115 on the pipe 4.1 to pressurize the first receiving tank 6, wait until the gas pressure of the first buffer tank 4 and the first receiving tank 6 is roughly equal, close the regulating valve 115, close the shut-off valve 21 on the pipe 3.1, open the regulating valve 119 on the pipe 3.2 and the pressure regulating valve 118 on the pipe 9.1, and depressurize the silo 1 to below 0.1MPa. After that, pressurize the first receiving tank 6 to the specified pressure through the regulating valve 113 on the pipe 1.6, close the regulating valve 113, and discharge the cyclone separator 5 (discharging ash, i.e. discharging solid waste particles).

[0071] When the second receiving tank 10 is pressurized, the cut-off valve 21 on the filter pipe 3.1 of the silo 1 is opened, and the regulating valve 116 on the pipe 4.2 is opened to pressurize the second receiving tank 10. When the gas pressures of the two are roughly equal, the cut-off valve 21 on the pipe 3.1 is closed, and the regulating valve 119 on the pipe 3.2 and the pressure regulating valve 118 on the pipe 9.1 are opened to release the pressure of the silo 1 to below 0.1 MPa. Then, the regulating valve 114 on the pipe 1.7 pressurizes the second receiving tank 10 to the specified pressure, and the regulating valve 114 is closed to discharge the ash from the first filter 11.

[0072] User operation scenario 4:

[0073] During the depressurization process of the silo 1, if both the first receiving tank 6 and the second receiving tank 10 need to be pressurized, the user can perform the following operations:

[0074] Open the shut-off valve 21 on the filter pipe 3.1 of the silo 1, open the regulating valve 115 on the pipe 4.1 to pressurize the first receiving tank 6, and when the gas pressures of the two are roughly equal, close the regulating valve 115, and open the regulating valve 113 on the pipe 1.6, charge to the specified pressure, close the regulating valve 113, and perform the ash discharge operation of the cyclone separator 5.

[0075] Open the regulating valve 116 on pipeline 4.2 to pressurize the second receiving tank 10. When the gas pressures of the two are roughly equal, close the regulating valve 116, open the regulating valve 114 on pipeline 1.7, and charge to the specified pressure to discharge the ash from the first filter 11. Then, sequentially open the cut-off valve 22 on pipeline 4.3 and the regulating valve 119 on pipeline 3.2 to discharge the remaining gas into the second buffer tank 7, and release the hydrogen in the second buffer tank 7 to the leaching tower 8. During this process, the pressure cascade control regulating valve 118 controls the pressure of the leaching tower 8 to be no higher than 0.1MPa. After completing the above operations, close the cut-off valve 21, the cut-off valve 22, and the regulating valve 119, and then carry out the material discharge operation of the silo 1.

[0076] User operation scenario five:

[0077] The silo 1 continues the material pushing process and there is hydrogen in the first buffer tank 4. When the first receiving tank 6 and the second receiving tank 10 are to be pressurized, the operations in the user operation scenario 4 can be performed.

[0078] User operation scenario six:

[0079] The silo 1 continues to push the material and there is no hydrogen in the first buffer tank 4. The first receiving tank 6 has just finished discharging ash and is ready to release pressure. The second receiving tank 10 is ready to be pressurized. Open the pipeline 6.1 shut-off valve 23 and the pipeline 6.2 regulating valve 117, and the second receiving tank 10 starts to be pressurized. When the gas pressures of the two are roughly equal, close the regulating valve 117, open the regulating valve 121 to release pressure to the second buffer tank 7, and the pressure cascade control regulating valve 118 controls the pressure of the elution tower 8 to be no higher than 0.1MPa. Release the pressure to below 0.1MPa, and close the shut-off valve 23. The second receiving tank 10 is pressurized and the pipeline 1.7 regulating valve 114 is opened to the specified pressure, and the regulating valve 114 is closed to perform the ash discharging operation.

[0080] Under the above conditions, the second receiving tank 10 has just finished ash discharge and is ready to release pressure, and the first receiving tank 6 is ready to be pressurized. Open the pipeline 8.1 cut-off valve 24 and the pipeline 6.3 regulating valve 120 to pressurize the second receiving tank 10. When the gas pressures of the two are roughly equal, close the regulating valve 120, open the regulating valve 121 to release pressure to the second buffer tank 7, and the pressure cascade control regulating valve 118 controls the pressure of the elution tower 8 to be released to below 0.1MPa, and close the cut-off valve 24. The second receiving tank 10 is pressurized and the pipeline 1.6 regulating valve 113 is opened to the specified pressure. After closing the regulating valve 113, the ash discharge operation is carried out.

[0081] In some embodiments of the present invention, optionally, the waste recycling device further comprises:

[0082] The waste storage tank (not shown in the figure), the bottom waste discharge port of the first receiving tank 6 is connected to the feed port of the waste storage tank (not shown in the figure).

[0083] The waste storage tank (not shown in the figure) is used to store the materials deposited in the first receiving tank 6 after being separated by the cyclone separator 5, and to recycle this part of the materials to improve resource utilization.

[0084] The utility model embodiment provides a cold hydrogenation system, see Figure 1 As shown, the cold hydrogenation system includes: a silo 1, a fluidized bed reactor (not shown in the figure), a cyclone separator 5, and a first filter 11; the bottom outlet of the silo 1 is connected to the feed inlet of the fluidized bed reactor (not shown in the figure), the discharge port of the fluidized bed reactor (not shown in the figure) is connected to the inlet of the cyclone separator 5, the outlet of the cyclone separator 5 is connected to the inlet of the first filter 11, and the cold hydrogenation system also includes a waste recovery device as any one of the embodiments of the utility model.

[0085] In the embodiments of the present utility model, by applying a waste recovery device such as any one of the embodiments of the present utility model, the waste of resources in the cold hydrogenation production process can be effectively reduced.

[0086] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A waste recycling device, characterized in that: The cold hydrogenation system comprises: a silo, a fluidized bed reactor, a cyclone separator, and a first filter; the bottom outlet of the silo is connected to the feed inlet of the fluidized bed reactor, the discharge port of the fluidized bed reactor is connected to the inlet of the cyclone separator, and the outlet of the cyclone separator is connected to the inlet of the first filter; The waste recycling device comprises: a heater, a first buffer tank, a first receiving tank, a second receiving tank, and a second buffer tank; The outlet of the heater is respectively connected with the top inlet of the silo, the bottom outlet of the silo, the feed port of the first receiving tank, and the feed port of the second receiving tank; the top outlet of the silo is connected with the feed port of the first buffer tank; the discharge port of the first buffer tank is connected with the feed port of the first receiving tank; the discharge port of the first receiving tank is respectively connected with the feed port of the second receiving tank and the feed port of the second buffer tank; the discharge port of the second receiving tank is connected with the feed port of the second buffer tank; The feed inlet of the first receiving tank is communicated with the discharge port of the cyclone separator, and the feed inlet of the second receiving tank is communicated with the discharge port of the first filter.

2. The waste recycling device according to claim 1, characterized in that: Also includes: The elution tower, the outlet of the second buffer tank is connected to the feed inlet of the elution tower.

3. The waste recycling device according to claim 1, characterized in that: Also includes: a steam generating device, wherein a steam outlet of the steam generating device is in communication with an inlet of the heater; A hydrogen gas source, wherein the gas outlet of the hydrogen gas source is communicated with the inlet of the heater.

4. The waste recycling device according to claim 1, characterized in that: The discharge port of the first buffer tank is communicated with the feed port of the second buffer tank.

5. The waste recycling device according to claim 1 or 4, characterized in that: The discharge port of the first buffer tank is communicated with the feed port of the second receiving tank.

6. The waste recycling device according to claim 1, characterized in that: Also includes: A second filter, wherein the inlet of the second filter is communicated with the top outlet of the silo, and the outlet of the second filter is communicated with the feed inlet of the first buffer tank.

7. The waste recycling device according to claim 1, characterized in that: Also includes: The third filter, the discharge port of the first receiving tank is communicated with the inlet of the third filter, and the outlet of the third filter is communicated with the feed port of the second buffer tank.

8. The waste recycling device according to claim 1, characterized in that: Also includes: The fourth filter, the discharge port of the second receiving tank is communicated with the inlet of the fourth filter, and the outlet of the fourth filter is communicated with the inlet of the second buffer tank.

9. The waste recycling device according to claim 1, characterized in that: Also includes: A waste storage tank, wherein the bottom waste discharge port of the first receiving tank is connected to the feed port of the waste storage tank.

10. A cold hydrogenation system, characterized in that: include: A silo, a fluidized bed reactor, a cyclone separator, and a first filter; the bottom outlet of the silo is connected to the feed inlet of the fluidized bed reactor, the discharge port of the fluidized bed reactor is connected to the inlet of the cyclone separator, the outlet of the cyclone separator is connected to the inlet of the first filter, and the cold hydrogenation system also includes a waste recovery device as described in any one of claims 1 to 9.

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