Experimental device and method for crystallization of salt cavern dissolution cavity gas injection brine removal column

Abstract

The present invention relates to a salt cavern gas injection brine removal pipe column crystallization experimental device and experimental method, and relates to the field of natural gas storage technology, and is used to solve the problem that the brine removal pipe column crystallization and pipe column blockage in the process of gas injection and brine removal in the salt cavern gas injection can not be simulated at present. The salt cavern gas injection brine removal pipe column crystallization experimental method of the present invention can accurately find the main factors affecting the brine crystallization and blocking of the brine removal pipe column in the process of gas injection and brine removal in the actual salt cavern gas injection and brine removal, thereby providing basic parameters for scientifically and reasonably determining the salt cavern gas injection and brine removal operation parameters.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas storage, and in particular to a salt cavern dissolution cavity gas injection brine removal column crystallization experimental device and an experimental method. Background Art

[0002] Gas injection and brine removal are key processes before salt cavern gas storage enters the operation stage. During this process, saturated brine precipitates crystals, which adhere to the inner wall of the brine removal pipe column and grow rapidly. If it is not cleaned in time, it may even cause the brine removal pipe column to be blocked in severe cases, interrupting the gas injection and brine removal operations.

[0003] Using salt rock formations to build reservoirs to store natural gas is one of the important means to ensure the security of natural gas supply in my country. During the construction of salt cavern reservoirs, fresh water is injected into the salt rock formation through the wellbore to dissolve the salt rock to form an underground salt cavern cavity. Then, natural gas is injected into the underground salt cavern cavity through the pipe column system to discharge the brine in the salt cavern cavity, thereby forming an underground gas storage reservoir. This process is called gas injection and brine discharge. During the gas injection and brine discharge process, natural gas is injected through the annulus between the gas injection and brine discharge inner pipe and the gas injection and brine discharge outer pipe, and the brine is discharged from the brine discharge inner pipe. Due to the large buried depth of the salt cavern cavity (for example, the buried depth of the Jianghan salt cavern gas storage is about 2000m), the temperature of the brine continues to decrease during the gas injection and brine discharge process as it moves upward along the brine discharge inner pipe. The salt in the brine will crystallize and precipitate, and adhere to the inner wall of the brine discharge pipe column, causing the brine discharge inner pipe to be blocked. In severe cases, the brine discharge inner pipe needs to be replaced. At present, there is no experimental device and method for the crystallization of brine removal columns during gas injection and brine removal in salt caverns that can simulate the crystallization process of brine removal columns during gas injection and brine removal in salt caverns, which restricts the optimization design of reasonable brine removal parameters during gas injection and brine removal in salt caverns. Summary of the invention

[0004] The present invention provides a salt cavern dissolution cavity gas injection brine removal pipe column crystallization experimental device and experimental method, which are used to solve the problem that the brine removal pipe column crystallization blocks the pipe column in the process of salt cavern dissolution cavity gas injection brine removal that cannot be simulated at present, find the main influencing factors affecting the crystallization and blocking of the gas injection brine removal pipe column, provide basic data and theoretical basis for scientifically and rationally designing salt cavern dissolution cavity gas injection brine removal parameters, and ensure the efficient completion of salt cavern dissolution cavity gas injection brine removal.

[0005] According to a first aspect of the present invention, the present invention provides a salt cavern cavity gas injection brine removal column crystallization experimental method, comprising the following steps:

[0006] Step 1: Connect the experimental device, prepare brine for the experiment and determine the experimental parameters;

[0007] Step 2: Add the experimental brine into the heating unit of the experimental device;

[0008] Step 3: When the temperature of the experimental brine in the heating unit reaches a preset temperature, the experimental brine is circulated among the heating unit, the intermediate temporary storage unit, and the test tube connected to the intermediate temporary storage unit;

[0009] Step 4: Control the outlet brine temperature and the outlet brine temperature of the test tube to meet the experimental requirements;

[0010] Step 5: Measure the wall thickness of the crystals on the test tube and analyze the crystals in the test tube;

[0011] Step 6: Draw the relationship curve between the experimental parameters and the crystal wall thickness, analyze the influencing factors of the test tube crystallization and quantify the weights of different influencing factors.

[0012] In one embodiment, in step 2, solid materials are also added to the heating unit to ensure that the experimental brine in the heating unit is always in a saturated state.

[0013] In one embodiment, in step 1, preparing brine for the experiment comprises the following steps:

[0014] Step 11: preparing a corresponding volume of fresh water according to the volume of the heating container in the heating unit and the intermediate container in the intermediate storage unit;

[0015] Step 12: Calculate the mass of monovalent salt and divalent salt that needs to be added to the fresh water according to the content of monovalent salt and divalent salt in the brine in the actual salt cave cavity;

[0016] Step 13: Add corresponding masses of monovalent salt and divalent salt to the fresh water in sequence, and stir evenly until there is no solid sediment;

[0017] Step 14: Add a dye to the brine in step 13 to obtain brine for the experiment.

[0018] In one embodiment, the experimental parameters include test tube size, displacement, test tube inlet brine temperature, and test tube outlet brine temperature.

[0019] In one embodiment, in step 5, when the crystal thickness reaches the value set in the experiment, the experimental device is stopped and cooled to room temperature in a natural state, and then the influencing factors of the crystallization of the test tube are analyzed and the weights of different influencing factors are quantified.

[0020] According to a second aspect of the present invention, the present invention provides a salt cavern dissolution cavity gas injection brine removal column crystallization experimental device, which comprises:

[0021] A heating unit, which is used to heat the experimental brine to a predetermined condition;

[0022] an intermediate temporary storage unit connected to the heating unit; and

[0023] A crystallization test unit, whose inlet end is connected to the intermediate temporary storage unit, and whose outlet end is connected to the heating unit;

[0024] Among them, the output side of the heating unit is connected to the input side of the intermediate temporary storage unit, so that the experimental brine in the heating unit can enter the intermediate temporary storage unit; the input side of the heating unit is also connected to the outlet end of the crystallization test unit, so that the experimental brine can circulate between the heating unit, the intermediate temporary storage unit and the crystallization test unit.

[0025] In one embodiment, a solid material storage mechanism is provided in the heating unit, and the solid material storage mechanism is used to store solid materials to keep the experimental brine in a saturated state.

[0026] In one embodiment, the crystallization test unit includes a test tube and a first connecting tube, a heat exchanger is disposed on the outside of the test tube, a first joint at the first end of the test tube is connected to the intermediate temporary storage unit, and a second joint at the second end of the test tube is connected to the input side of the heating unit through the first connecting tube;

[0027] The first connecting pipe is provided with a flow meter and a throttle valve in sequence;

[0028] Both ends of the test tube are provided with temperature monitoring mechanisms.

[0029] In one embodiment, the outlet of the heat exchanger is higher than the second joint, and the inlet of the heat exchanger is lower than the first joint.

[0030] In one embodiment, a pump device is provided on the pipeline between the input side of the heating unit and the input side of the intermediate temporary storage unit;

[0031] The heating unit and the intermediate temporary storage unit are both provided with a temperature display and a control panel; the side of the intermediate temporary storage unit is also provided with an observation window;

[0032] A heating resistance wire is arranged at the bottom of the heating unit, and a liquid adding port and a solid material adding port are respectively arranged at the upper end of the heating unit.

[0033] Compared with the prior art, the advantage of the present invention is that by simulating the crystallization and plugging process of the brine drainage pipe column during the actual gas injection and brine drainage process in the salt cavern dissolution cavity, the main factors affecting the brine crystallization and plugging of the brine drainage pipe column can be accurately found, thereby providing basic parameters for scientifically and reasonably determining the gas injection and brine drainage operation parameters of the salt cavern dissolution cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0035] Figure 1 It is a structural schematic diagram of a salt cavern dissolution cavity gas injection and brine removal column crystallization experimental device in an embodiment of the present invention.

[0036] Reference numerals:

[0037] 1-heating unit; 2-temperature display and control panel; 3-liquid filling port; 4-solid material filling port; 5-throttle valve; 6-flow meter; 7-solid material storage mechanism; 8-heating resistance wire; 9-second connecting pipe; 10-pump device; 11-intermediate temporary storage unit; 12-observation window; 14-liquid outlet; 15-inlet thermometer; 16-condensate outlet; 17-first joint; 18-heat exchanger; 19-test tube; 20-second joint; 21-condensate inlet; 22-outlet thermometer; 23-first connecting pipe. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Example 1

[0040] According to a first aspect of the present invention, the present invention provides a salt cavern dissolution cavity gas injection brine removal column crystallization experimental method, which comprises the following steps.

[0041] Step 1: Connect the experimental equipment, prepare the brine for the experiment and determine the experimental parameters.

[0042] First, the experimental device is an experimental device for realizing the salt cavern cavity gas injection brine column crystallization experimental method, which mainly includes a heating unit 1, an intermediate temporary storage unit 11 and a crystallization test unit. The heating unit 1 is used to heat the experimental brine to a predetermined condition; the intermediate temporary storage unit 11 is connected to the heating unit 1; the inlet end of the crystallization test unit is connected to the intermediate temporary storage unit 11, and its outlet end is connected to the heating unit 1. The heating unit 1 includes a heating container, and the intermediate temporary storage unit 11 includes an intermediate container. The experimental device will be described in detail below.

[0043] Secondly, preparing brine for the experiment includes the following steps.

[0044] Step 11: Prepare corresponding volumes of fresh water according to the volumes of the heating container and the intermediate container. For example, if the volume of the heating container is L1 and the volume of the intermediate container is L2, the volume of fresh water added to the heating container can be 1.2L1, and the volume of fresh water added to the intermediate container can be 1.2L2, that is, the volume of the fresh water is 1.2 times the volume of the corresponding container. It can be understood that the multiple relationship between the above volumes can also be changed according to experimental requirements.

[0045] Step 12: Calculate the mass of monovalent salt and divalent salt to be added to fresh water according to the content of monovalent salt and divalent salt in the actual salt cavern cavity. The monovalent salt may be NaCl, for example, and the divalent salt may be MgCl2, Na2SO4, and CaSO4, for example.

[0046] Step 13: Add corresponding masses of monovalent salt and divalent salt to the fresh water in turn, and stir evenly until there is no solid sediment.

[0047] Step 14: Add dye to the brine in step 13 to obtain experimental brine. The purpose of adding dye to the brine is to facilitate the observation of brine crystals.

[0048] Finally, the experimental parameters are determined by determining the actual on-site gas injection and brine removal operation pipe string size, displacement, salt cavern cavity temperature and ground temperature. The experimental parameters include the test pipe 19 size, displacement, test pipe 19 inlet brine temperature and test pipe 19 outlet brine temperature described below.

[0049] Step 2: Add the brine for the experiment into the heating unit 1 of the experimental device for heating. During this period, the heating unit 1 and the intermediate temporary storage unit 11 can be connected, and the two can be connected again after the heating unit 1 is heated to a certain temperature.

[0050] Since the monovalent salt and / or divalent salt in the experimental brine will precipitate after crystallization, which will reduce the concentration of the experimental brine, solid materials are further added to the heating unit 1 to ensure that the experimental brine in the heating unit 1 is always in a saturated state. The solid material can be a solid monovalent salt and a divalent salt, such as solid NaCl and solid MgCl2, Na2SO4, CaSO4. By providing a solid material storage mechanism in the heating unit 1, the solid material can be placed therein, thereby ensuring the concentration of the experimental brine.

[0051] In addition, according to the experimental needs, the mass of MgCl2, Na2SO4 and CaSO4 that need to be added can be determined to study the influence of the content of MgCl2, Na2SO4 and CaSO4 on the crystallization of the salt cavern cavity gas injection and brine removal column. The corresponding mass of MgCl2, Na2SO4 and CaSO4 are wrapped with gauze and placed in the solid material storage mechanism 7 through the solid material feeding port 4. Among them, MgCl2, Na2SO4 and CaSO4 can be placed separately or together.

[0052] Place them individually or together in a solid material storage box and secure them firmly;

[0053] Step 3: Start heating in the heating unit 1. When the temperature of the experimental brine in the heating unit 1 reaches a preset temperature, circulate the experimental brine among the heating unit 1, the intermediate temporary storage unit 11 and the test tube 19 connected to the intermediate temporary storage unit 11.

[0054] The temperature of the experimental brine in the heating unit 1 can be detected by a temperature measuring element on the heating unit 1 , and the heating temperature can also be controlled by controlling the heating element in the heating unit 1 .

[0055] Step 4: Control the outlet brine temperature and the outlet brine temperature of the test tube 19 to meet the experimental requirements.

[0056] Specifically, the outlet brine temperature and the outlet brine temperature of the test tube 19 can be controlled by controlling the coolant inlet flow and temperature in the heat exchanger 18 outside the test tube 19. During this period, the outlet brine temperature and the outlet brine temperature of the test tube 19 are recorded at a specified time. For example, the records can be made every hour.

[0057] During this period, fresh water can be added to the test tube 19. Specifically, a fresh water injection column (not shown) can be set inside the test tube 19. During the process of gas injection and brine removal, fresh water can be added to the test tube 19 by injecting fresh water columns. On the one hand, this can solve the problem of brine in the test tube 19 being oversaturated and forming salt crystals as the temperature decreases; on the other hand, this anti-crystallization method also avoids the disadvantage of interrupting the gas injection and brine removal operation and prolonging the construction period in the conventional reverse circulation flushing method.

[0058] Step 5: Measure the crystal wall thickness on the test tube 19 and analyze the crystals in the test tube 19. For example, the crystal wall thickness can be measured once every hour at intervals of 10 cm along the length of the test tube 19. In addition, a handheld ultrasonic wall thickness measuring instrument can be used to measure the crystal wall thickness.

[0059] Furthermore, when the crystal thickness reaches the value set in the experiment, the above-mentioned experimental device is stopped and cooled to room temperature in a natural state, and then the influencing factors of the crystallization of the test tube 19 are analyzed and the weights of different influencing factors are quantified.

[0060] Step 6: Draw a relationship curve between the experimental parameters and the crystal wall thickness, analyze the influencing factors of the crystallization of the test tube 19, and quantify the weights of different influencing factors.

[0061] In summary, the method of the present invention can effectively solve the problem of lack of experimental equipment and experimental methods for simulating the crystallization of brine removal columns in the process of gas injection and brine removal in salt caverns, and has the advantages of clear operating steps, clear parameter value range and high experimental accuracy.

[0062] Example 2

[0063] like Figure 1 As shown, according to the second aspect of the present invention, the present invention provides an experimental device for realizing the above-mentioned salt cavern cavity gas injection and brine removal column crystallization experimental method, which includes a heating unit 1, an intermediate temporary storage unit 11 and a crystallization test unit. The heating unit 1 is used to heat the experimental brine to a predetermined condition; the intermediate temporary storage unit 11 is connected to the heating unit 1; the inlet end of the crystallization test unit is connected to the intermediate temporary storage unit 11, and its outlet end is connected to the heating unit 1. Among them, the output side of the heating unit 1 is connected to the input side of the intermediate temporary storage unit 11, so that the experimental brine in the heating unit can enter the intermediate temporary storage unit 11 for cooling; the input side of the heating unit 1 is also connected to the outlet end of the crystallization test unit, so that the experimental brine circulates between the heating unit 1, the intermediate temporary storage unit 11 and the crystallization test unit.

[0064] It can be understood that the heating unit 1 may include a heating container, and the intermediate storage unit 11 may include an intermediate container.

[0065] A solid material storage mechanism 7 is provided in the heating unit 1, and the solid material storage mechanism 7 is used to store solid materials so as to keep the experimental brine in a saturated state.

[0066] Optionally, in order to facilitate the dissolution of solid materials, the solid material storage mechanism 7 may be constructed with a side wall or a bottom wall having a grid-like structure.

[0067] Preferably, the solid storage mechanism 7 includes a box and a movable plate for storing solid materials, and the box can be opened or closed by rotating the movable plate. The movable plate is connected to the control unit and driven to rotate by the control unit. The control unit is connected to the concentration detector or the conductivity meter in the heating unit 1. The concentration detector or the conductivity meter is used to monitor the concentration of the experimental brine in the heating unit 1. When the concentration decreases, a signal is sent to the control unit, and the control unit drives the movable plate to rotate to open the box, so that the solid material stored in the box can enter the heating unit 1 for dissolution.

[0068] The crystallization test unit includes a test tube 19 and a first connecting tube 23. A heat exchanger 18 is arranged outside the test tube 19. A first joint 17 at a first end of the test tube 19 is connected to the intermediate temporary storage unit 11. A second joint 20 at a second end of the test tube 19 is connected to the input side of the heating unit through the first connecting tube 23. Thus, the experimental brine can circulate between the heating unit 1, the intermediate temporary storage unit 2 and the crystallization test unit.

[0069] Furthermore, a flow meter 6 and a throttle valve 5 are sequentially arranged on the first connecting pipe 23. The flow meter 6 is used to control the circulation speed of the experimental brine, and the throttle valve 5 is used to make the liquid or gas-liquid mixture in the first connecting pipe 23 flow only in the direction from the test pipe 19 to the heating unit 1, but not in the reverse direction.

[0070] Both ends of the test tube 19 are provided with temperature monitoring mechanisms.

[0071] Optionally, the temperature monitoring mechanism includes an inlet thermometer 15 disposed at the first end of the test tube 19 and an outlet thermometer 22 disposed at the second end of the test tube 19 to obtain the outlet brine temperature and the outlet brine temperature of the test tube 19 respectively.

[0072] Optionally, the temperature monitoring mechanism includes an infrared thermometer, which is connected to the temperature display and control panel 2 on the heating unit 1, so that the outlet brine temperature of the test tube 19 and the outlet brine temperature can be displayed on the temperature display and control panel 2.

[0073] The outlet of the heat exchanger 18 is higher than the second joint 20, and the inlet of the heat exchanger 18 is lower than the first joint 17. The inlet of the heat exchanger 18 is the condensate inlet, and the outlet of the heat exchanger 18 is the condensate outlet. The test tube 19 is further cooled by the heat exchanger 18 to accelerate crystallization and avoid too long an experimental time.

[0074] A pump device 10 is provided on the pipeline (ie, the second pipeline 9) between the input side of the heating unit 1 and the input side of the intermediate temporary storage unit 11, through which the experimental brine can be circulated.

[0075] In addition, the heating unit 1 and the intermediate temporary storage unit 11 are both provided with a temperature display and control panel 2, which can display and control the temperature of the brine in the heating unit 1 and the cold zone unit 11 respectively.

[0076] An observation window 12 is also provided on the side of the intermediate temporary storage unit 11 , through which the brine in the intermediate temporary storage unit 11 can be observed.

[0077] A heating resistor wire 8 is disposed at the bottom of the heating unit 1, and a liquid adding port 3 is disposed at the upper end of the heating unit 1, through which experimental brine can be added to the heating unit 1. A similar arrangement can be adopted in the intermediate temporary storage unit 11.

[0078] The upper end of the heating unit 1 is also provided with a solid material feeding port 4, which can be connected to a solid material storage mechanism 7 to allow solid materials to be placed therein.

[0079] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A salt cavern gas injection brine removal column crystallization experimental method, characterized in that: The following steps are involved: Step 1: Connect the experimental device, prepare brine for the experiment and determine the experimental parameters; Step 2: Add the experimental brine into the heating unit of the experimental device; also add solid materials into the heating unit to ensure that the experimental brine in the heating unit is always in a saturated state; the heating unit is provided with a solid material storage mechanism, which is used to store solid materials to keep the experimental brine in a saturated state; the solid material storage mechanism includes a box and a movable plate for storing solid materials, the box can be opened or closed by rotating the movable plate, the movable plate is connected to a control unit and driven to rotate by the control unit; the control unit is connected to a concentration detector or a conductivity meter in the heating unit, the concentration detector or the conductivity meter is used to monitor the concentration of the experimental brine in the heating unit, when its concentration drops, a signal is sent to the control unit, the control unit drives the movable plate to rotate, so that the box is opened, so that the solid material stored in the box can enter the heating unit for dissolution; Step 3: When the temperature of the experimental brine in the heating unit reaches a preset temperature, the experimental brine is circulated between the heating unit, the intermediate temporary storage unit and the test tube connected to the intermediate temporary storage unit; Step 4: controlling the outlet brine temperature and the outlet brine temperature of the test tube to meet the experimental requirements, during which fresh water is added to the test tube through the fresh water injection column inside the test tube; Step 5: Measure the wall thickness of the crystals on the test tube and analyze the crystals in the test tube; Step 6: Draw the relationship curve between the experimental parameters and the crystal wall thickness, analyze the influencing factors of the test tube crystallization and quantify the weights of different influencing factors.

2. The salt cavern gas injection brine removal column crystallization experimental method according to claim 1 is characterized in that: In step 1, preparing brine for the experiment includes the following steps: Step 11: preparing a corresponding volume of fresh water according to the volume of the heating container in the heating unit and the intermediate container in the intermediate storage unit; Step 12: Calculate the mass of monovalent salt and divalent salt that needs to be added to the fresh water according to the content of monovalent salt and divalent salt in the brine in the actual salt cave cavity; Step 13: Add corresponding masses of monovalent salt and divalent salt to the fresh water in sequence, and stir evenly until there is no solid sediment; Step 14: Add a dye to the brine in step 13 to obtain brine for the experiment.

3. The salt cavern gas injection brine removal column crystallization experimental method according to claim 1, characterized in that: The experimental parameters include the test tube size, displacement, test tube inlet brine temperature and test tube outlet brine temperature.

4. The salt cavern gas injection brine removal column crystallization experimental method according to claim 1, characterized in that: In step 5, when the crystal thickness reaches the value set in the experiment, the experimental device is stopped and cooled to room temperature in a natural state, and then the influencing factors of the crystallization of the test tube are analyzed and the weights of different influencing factors are quantified.

5. A salt cavern dissolution cavity gas injection brine removal column crystallization experimental device, characterized in that: include: A heating unit, which is used to heat the experimental brine to a predetermined condition; a solid material storage mechanism is provided in the heating unit, and the solid material storage mechanism is used to store solid materials to keep the experimental brine in a saturated state; the solid material storage mechanism includes a box and a movable plate for storing solid materials, and the box can be opened or closed by rotating the movable plate, and the movable plate is connected to a control unit and driven to rotate by the control unit; the control unit is connected to a concentration detector or a conductivity meter in the heating unit, and the concentration detector or the conductivity meter is used to monitor the concentration of the experimental brine in the heating unit, and when the concentration drops, a signal is sent to the control unit, and the control unit drives the movable plate to rotate to open the box, so that the solid material stored in the box can enter the heating unit for dissolution; An intermediate temporary storage unit connected to the heating unit; as well as A crystallization test unit, whose inlet end is connected to the intermediate temporary storage unit and whose outlet end is connected to the heating unit, wherein the crystallization test unit comprises a test tube, wherein a fresh water injection column is arranged inside the test tube, and fresh water is added to the test tube through the fresh water injection column; Among them, the output side of the heating unit is connected to the input side of the intermediate temporary storage unit, so that the experimental brine in the heating unit can enter the intermediate temporary storage unit; the input side of the heating unit is also connected to the outlet end of the crystallization test unit, so that the experimental brine can circulate between the heating unit, the intermediate temporary storage unit and the crystallization test unit.

6. The salt cavern gas injection and brine removal column crystallization experimental device according to claim 5 is characterized in that: The crystallization test unit comprises a first connecting pipe, a heat exchanger is arranged on the outside of the test pipe, a first joint at the first end of the test pipe is connected to the intermediate temporary storage unit, and a second joint at the second end of the test pipe is connected to the input side of the heating unit through the first connecting pipe; The first connecting pipe is provided with a flow meter and a throttle valve in sequence; Both ends of the test tube are provided with temperature monitoring mechanisms.

7. The salt cavern gas injection and brine removal column crystallization experimental device according to claim 6 is characterized in that: The outlet of the heat exchanger is higher than the second joint, and the inlet of the heat exchanger is lower than the first joint.

8. The salt cavern gas injection and brine removal column crystallization experimental device according to claim 5 is characterized in that: A pump device is provided on the pipeline between the input side of the heating unit and the input side of the intermediate temporary storage unit; The heating unit and the intermediate temporary storage unit are both provided with a temperature display and a control panel; the side of the intermediate temporary storage unit is also provided with an observation window; A heating resistance wire is arranged at the bottom of the heating unit, and a liquid adding port and a solid material adding port are respectively arranged at the upper end of the heating unit.

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