Integrated high-pressure feeding system of autoclave

Abstract

The utility model belongs to the technical field of reaction kettle feeding devices, and particularly relates to an integrated high-pressure feeding system of an autoclave. Wherein the premixing feeder, the air storage tank and the air compressor are fixed in the integrated protective shell, and a feeding pipeline and a discharging pipeline are arranged in the integrated protective shell; a mechanical stirrer, a liquid level switch and a deep liquid discharge pipe are arranged on a pressure-bearing kettle body of the premixing feeder, and a heat preservation layer is sleeved outside the pressure-bearing kettle body to form a heat exchange jacket; a feeding valve is arranged at a feeding port of the pressure-bearing kettle body, an air inlet valve and an exhaust valve are arranged at a ventilation port, an emptying valve is arranged at an outlet, the heater and the temperature sensor enter the heat exchange jacket, the air compressor is communicated with the air storage tank, the air storage tank is communicated with the air inlet valve of the premixing feeder, and the feeding pipeline is connected with the feeding valve of the premixing feeder. The discharging pipeline is connected with a high-position discharging valve of the premixing feeder; the device can realize continuous feeding and discharging and continuous production of the autoclave, and is applied to gold extraction of Carlin dip dyeing type refractory gold-bearing ore by adopting a pressure oxidation pretreatment process in the gold industry.

Description

Technical Field

[0001] The utility model belongs to the technical field of reaction kettle feeding devices, and in particular relates to an integrated high-pressure feeding system for an autoclave. Background Art

[0002] An autoclave is a device used for chemical reactions, material synthesis and heating treatment, usually operated at high temperature and high pressure. By controlling the pressure in the autoclave, some reactions are carried out under high pressure, thereby producing more efficient reaction results. Many liquid phase reactions need to be carried out under high temperature and / or high pressure conditions. Redox reactions are usually more efficient under high temperature and high pressure. The gold industry uses a pressure oxidation process to fully oxidize and decompose sulfide minerals in the autoclave to extract gold in the Carlin impregnation type refractory gold-bearing ore. However, the reaction materials need to be added continuously in a timely manner during the production process, and the current reactor cannot be continuously fed and discharged under high pressure, which is far from meeting the production needs. Therefore, it is necessary to provide a continuous feeding device. The pneumatic conveying device belongs to dense phase medium pressure pneumatic conveying, which is suitable for the conveying of non-breakable particles, powder materials and fluids. It is widely used in casting, chemical, pharmaceutical and food industries. The pneumatic conveying device, conveying pipeline, supercharger and other components form a sealed conveying system, which can be equipped with an automatic control electronic control system to realize continuous feeding under high pressure environment under PLC automatic control of the entire system of the autoclave. Summary of the invention

[0003] In order to overcome the above problems, the utility model provides an integrated high-pressure feeding system for an autoclave, which adopts the principle of pneumatic conveying to realize continuous feeding and discharging of the autoclave and continuous production, and is applied to the gold industry to extract gold from Carlin impregnation-type difficult-to-treat gold-containing ores using a pressure oxidation pretreatment process.

[0004] An integrated high-pressure feeding system for an autoclave comprises an integrated protective shell 1, a premixing feeder 1 2, a premixing feeder 2 3, a gas storage tank 4 and an air compressor 5, wherein the premixing feeder 1 2, the premixing feeder 2 3, the gas storage tank 4 and the air compressor 5 are fixed in the integrated protective shell 1 from left to right in sequence, and a feed pipe 13 and a discharge pipe 14 are arranged in the integrated protective shell 1;

[0005] The premix feeder 1 2 and the premix feeder 2 3 have the same structure, and both include a mechanical agitator 21, a pressure kettle body 22, a heater 26, a liquid level switch 27, a temperature sensor 29, and a depth drain pipe 222, wherein the pressure kettle body 22 is provided with a mechanical agitator 21 and a depth drain pipe 222, and the pressure kettle body 22 is externally sheathed with a heat-insulating layer 224, so that a heat exchange jacket 223 is formed between the pressure kettle body 22 and the heat-insulating layer 224; the pressure kettle body 22 is provided with a feed inlet and an air vent at the top, and an outlet at the bottom, wherein a feed valve 23 is provided at the feed inlet, an air inlet valve 24 and an exhaust valve 25 are provided at the air vent, and an emptying valve 210 is provided at the outlet at the bottom, The liquid level switch 27 is fixed on the top of the pressure kettle body 22 and extends into the interior thereof, the heater 26 and the temperature sensor 29 respectively pass through the insulation layer 224 and enter the heat exchange jacket 223, and a high-level discharge valve 28 is provided on the top of the depth discharge pipe 222; the air compressor 5 is connected with the gas storage tank 4 by pipeline, and a pressure sensor 41 is provided on the top of the gas storage tank 4, and the gas outlet of the gas storage tank 4 is connected with the air inlet valve 24 of the premix feeder 1 2 and the premix feeder 2 3 through pipelines, the feed pipe 13 is respectively connected with the feed valve 23 of the premix feeder 1 2 and the premix feeder 2 3, and the discharge pipe 14 is respectively connected with the high-level discharge valve 28 of the premix feeder 1 2 and the premix feeder 2 3.

[0006] An exhaust port 228 is disposed on the upper side wall of the thermal insulation layer 224 , and a heat exchange medium inlet and outlet 227 is disposed on the bottom, wherein the exhaust port 228 and the heat exchange medium inlet and outlet 227 are both connected to the heat exchange jacket 223 .

[0007] The air inlet valve 24 and the air outlet valve 25 are respectively connected to the air vents of the pressure vessel body 22 through pipelines.

[0008] The pressure-bearing kettle body 22 has a built-in turbulence plate 221 , and a kettle body support 226 is fixed to the bottom of the insulation layer 224 .

[0009] The mechanical agitator 21 includes a motor, a stirring shaft and stirring blades, wherein the motor is fixed to the pressure kettle body 22 through an agitator sealing support 225, the stirring shaft is connected to the driving shaft of the motor, and is driven to rotate by the motor, and the stirring shaft passes through the top of the pressure kettle body 22 and extends into the pressure kettle body 22, and a plurality of blades are fixed to the bottom of the stirring shaft located in the pressure kettle body 22.

[0010] The heater 26 penetrates into the heat exchange jacket 223 from the bottom of the insulation layer 224 , and the temperature sensor 29 penetrates into the heat exchange jacket 223 from below the side wall of the insulation layer 224 .

[0011] The integrated protective shell 1 includes a supporting frame 11 and a protective outer plate 12, wherein the supporting frame 11 is arranged inside the protective outer plate 12, and the premix feeder 1 2, the premix feeder 2 3, the gas storage tank 4, and the air compressor 5 are all fixed on the supporting frame 11.

[0012] The depth discharge pipe 222 is fixed on the top of the pressure kettle body 22 and extends into the interior thereof, and a high-position discharge valve 28 is provided on the depth discharge pipe 222 located above the pressure kettle body 22 .

[0013] Beneficial effects of the utility model:

[0014] The setting of the premix feeder can complete the mixing and preheating of the slurry to be treated in advance, improving the efficiency of pressure oxidation of the slurry in the autoclave. The top ore inlet and deep liquid outlet structure design is combined with level meter control, and feeding is carried out under high-pressure gas pressure, realizing the one / two alternating continuous feeding function requirement of the premix feeder under high-pressure environment. The modular design facilitates engineering application maintenance and management, and is safer and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the premix feeder of the utility model.

[0018] Among them: 1—integrated protective housing; 2—premix feeder 1; 3—premix feeder 2; 4—gas storage tank; 5—air compressor; 6—PLC control module;

[0019] 11—support frame; 12—protective outer plate; 13—feeding pipe; 14—discharging pipe;

[0020] 21—mechanical agitator; 22—pressure kettle; 23—feed valve; 24—intake valve; 25—exhaust valve; 26—heater; 27—liquid level switch; 28—high-level discharge valve; 29—temperature sensor; 210—drain valve:

[0021] 221—turbulence plate; 222—deep drain pipe; 223—heat exchange jacket; 224—insulation layer; 225—stirrer sealing support; 226—kettle support; 227—heat exchange medium inlet and outlet; 228—exhaust port;

[0022] 41—Pressure sensor. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] Example 1

[0025] like Figure 1-2 As shown, an integrated high-pressure feeding system for an autoclave comprises an integrated protective shell 1, a premixing feeder 1 2, a premixing feeder 2 3, a gas storage tank 4 and an air compressor 5, wherein the premixing feeder 1 2, the premixing feeder 2 3, the gas storage tank 4 and the air compressor 5 are fixed in the integrated protective shell 1 from left to right, and a feeding pipe 13 and a discharging pipe 14 are arranged in the integrated protective shell 1;

[0026] The premix feeder 1 2 and the premix feeder 2 3 have the same structure, and both include a mechanical agitator 21, a pressure kettle body 22, a heater 26, a liquid level switch 27, a temperature sensor 29, and a depth drain pipe 222, wherein the pressure kettle body 22 is provided with a mechanical agitator 21 and a depth drain pipe 222, and the pressure kettle body 22 is externally sheathed with a heat-insulating layer 224, so that a heat exchange jacket 223 is formed between the pressure kettle body 22 and the heat-insulating layer 224; the pressure kettle body 22 is provided with a feed inlet and an air vent at the top, and an outlet at the bottom, wherein a feed valve 23 is provided at the feed inlet, an air inlet valve 24 and an exhaust valve 25 are provided at the air vent, and an emptying valve 210 is provided at the outlet at the bottom, The liquid level switch 27 is fixed on the top of the pressure kettle body 22 and extends into the interior thereof, the heater 26 and the temperature sensor 29 respectively pass through the insulation layer 224 and enter the heat exchange jacket 223, and a high-level discharge valve 28 is provided on the top of the depth discharge pipe 222; the air compressor 5 is connected with the gas storage tank 4 by pipeline, and a pressure sensor 41 is provided on the top of the gas storage tank 4, and the gas outlet of the gas storage tank 4 is connected with the air inlet valve 24 of the premix feeder 1 2 and the premix feeder 2 3 through pipelines, the feed pipe 13 is respectively connected with the feed valve 23 of the premix feeder 1 2 and the premix feeder 2 3, and the discharge pipe 14 is respectively connected with the high-level discharge valve 28 of the premix feeder 1 2 and the premix feeder 2 3.

[0027] An exhaust port 228 is disposed on the upper side wall of the thermal insulation layer 224 , and a heat exchange medium inlet and outlet 227 is disposed on the bottom, wherein the exhaust port 228 and the heat exchange medium inlet and outlet 227 are both connected to the heat exchange jacket 223 .

[0028] The air inlet valve 24 and the air exhaust valve 25 are respectively connected to the vent of the pressure kettle body 22 through pipelines. The vent of the pressure kettle body 22 passes through the insulation layer 224 and is located above the insulation layer 224.

[0029] The pressure-bearing kettle body 22 has a built-in turbulence plate 221 , and a kettle body support 226 is fixed to the bottom of the insulation layer 224 .

[0030] The mechanical agitator 21 includes a motor, a stirring shaft and stirring blades, wherein the motor is fixed to the pressure kettle body 22 through an agitator sealing support 225, the stirring shaft is connected to the driving shaft of the motor, and is driven to rotate by the motor, and the stirring shaft passes through the top of the pressure kettle body 22 and extends into the pressure kettle body 22, and a plurality of blades are fixed to the bottom of the stirring shaft located in the pressure kettle body 22.

[0031] The heater 26 penetrates into the heat exchange jacket 223 from the bottom of the insulation layer 224 , and the temperature sensor 29 penetrates into the heat exchange jacket 223 from below the side wall of the insulation layer 224 .

[0032] The integrated protective housing 1 includes a support frame 11 and a protective outer plate 12, wherein the support frame 11 is arranged inside the protective outer plate 12, and the premix feeder 1 2, the premix feeder 2 3, the gas storage tank 4, and the air compressor 5 are all fixed on the support frame 11. The premix feeder 1 2 and the premix feeder 2 3 are respectively fixed on the support frame 11 through the kettle support 226 at the bottom thereof, and the gas storage tank 4 is fixed on the support frame 11 through the bottom support rod.

[0033] The depth drainage pipe 222 passes through the insulation layer 224 and extends to the interior of the pressure kettle body 22 , and is fixed to the top of the pressure kettle body 22 . A high-position discharge valve 28 is provided on the depth drainage pipe 222 located above the pressure kettle body 22 .

[0034] The working process of the utility model is as follows: first, the heat exchange medium inlet and outlet 227 is opened to pass the heat exchange medium into the heat exchange jacket 223, the high-position exhaust valve 25 and the feed valve 23 of the premix feeder 2 are opened, and the feed pipe 13 continuously feeds the materials to be mixed and reacted into the pressure kettle body 22 of the premix feeder 2 through the feed valve 23, and when the liquid level reaches the set lower limit through the liquid level switch 27, the mechanical agitator 21 is started, and the material is mixed and separated under the action of the internal turbulence plate 221, and at the same time, the heat exchanger installed in the pressure kettle body 22 is The heater 26 in the heat jacket 223 starts to heat the heat exchange medium in the heat exchange jacket 223, and the heat exchange medium heats the material in the pressure kettle body 22 until the specified temperature is detected by the temperature sensor 29, and the heater 26 stops working. When the material level in the premix feeder 2 monitored by the liquid level switch 27 reaches the upper limit and the temperature reaches the specified requirement, the high-level exhaust valve 25 and the feed valve 23 are closed, the intake valve 24 is opened, the air compressor 5 is started, and the constant-pressure gas is supplied to the gas storage tank 4. After the pressure sensor 41 monitors that a certain pressure has been reached in the gas storage tank 4, the pressurized gas enters the pressure kettle body 22, the high-level discharge valve 28 is opened, and the material is continuously discharged at a certain pressure through the deep discharge pipe 222, the high-level discharge valve 28, and the discharge pipe 14 of the integrated protective shell 1, and enters the autoclave; while the premix feeder 1 2 is discharging, the exhaust valve 25 and the feed valve 23 of the premix feeder 2 3 are opened, and the feed pipe 13 of the integrated protective shell 1 begins to fill the premix feeder 2 3 with material, and the heat exchange of the premix feeder 2 3 is The heater 26 in the jacket 223 is turned on for heating; as the material in the premix feeder 2 is discharged, when the liquid level in the premix feeder 2 reaches the lower limit through the liquid level switch 27, the air intake valve 24 and the high-level discharge valve 28 on the premix feeder 2 are closed, and the exhaust valve 25 and the feed valve 23 at the top of the premix feeder 2 are opened. At the same time, the air intake valve 24 and the high-level discharge valve 28 at the top of the premix feeder 23 are opened, so that the premix feeder 2 and the premix feeder 23 can alternately and continuously output the material to the pressure reactor under high pressure. When the high-pressure feeding system stops working, the material is emptied through the drain valve 210 at the bottom.

[0035] During the heating process, the exhaust port 228 is opened periodically to exhaust air.

[0036] Example 2

[0037] See also Figure 1 , Figure 2As shown, the utility model is composed of an integrated protective shell 1, a premix feeder 1 2, a premix feeder 2 3, a gas storage tank 4, an air compressor 5, and a PLC control module 6. The integrated protective shell 1 includes a supporting frame 11, a protective outer plate 12, a feed pipe 13, and a discharge pipe 14. The premix feeder 1 2 and the premix feeder 2 3 are composed of a mechanical agitator 21, a pressure kettle 22, a feed valve 23, an air intake valve 24, an exhaust valve 25, a heater 26, a liquid level switch 27, a high-level discharge valve 28, a temperature sensor 29, and an emptying valve 210. The pressure kettle 22 has a built-in turbulence plate 221, a deep The mechanical agitator 21 of the premix feeder 1 2 and the premix feeder 2 3 is fixed on the pressure kettle 22 through the agitator sealing support 225, and the feed valve 23, the air inlet valve 24, the exhaust valve 25, and the drain valve 210 are connected to the inside of the pressure kettle 22, and the liquid level switch 27 is placed on the top of the pressure kettle 22 and Extending to the interior thereof, the heater 26 and the temperature sensor 29 pass through the insulation layer 224 and are fixed in the heat exchange jacket 223, and the high-level discharge valve 28 is installed on the deep discharge pipe 222; the air compressor 5 is connected with the gas storage tank 4 by pipeline, and a pressure sensor 41 is arranged on the top of the gas storage tank 4, and the gas storage tank 4 is connected with the air inlet valve 24 of the premix feeder 1 2 and the premix feeder 2 3 through pipelines, respectively, the premix feeder 1 2, the premix feeder 2 3, the gas storage tank 4, and the air compressor 5 are all fixed on the supporting rack 11 inside the integrated protective shell 1, and the PLC control module 6 is placed on the protective plate 12 outside the integrated protective shell 1, the feed pipe 13 of the integrated protective shell 1 is respectively connected with the feed valve 23 of the premix feeder 1 2 and the premix feeder 2 3, and the discharge pipe 14 of the integrated protective shell 1 is respectively connected with the high-level discharge valve 28 of the premix feeder 1 2 and the premix feeder 2 3.

[0038] The working process of the utility model is as follows: the PLC control module 6 is started to set the system working pressure, temperature, stirring speed and duration. First, open the high-level exhaust valve 25 and the feed valve 23 of the premix feeder 2, and the feed pipe 13 continuously feeds the materials to be mixed and reacted into the pressure kettle body 22 of the premix feeder 2 through the feed valve 23. When the liquid level reaches the lower limit of the liquid level switch 27, the top mechanical agitator 21 starts, and the material is mixed and separated under the action of the internal turbulence plate 221. At the same time, the heater 26 installed in the heat exchange jacket 223 of the pressure kettle body 22 starts to heat the heat exchange medium in the jacket 223, and the heat exchange medium heats the material in the pressure kettle body 22 until the temperature sensor 29 detects that the specified temperature has been reached, and the heater 26 stops working. When the material level of the premix feeder 2 reaches the upper limit of the liquid level switch 27 and the temperature reaches the specified requirement, close the high-level exhaust valve 25 and the feed valve 23, open the air intake valve 24, and start the air compressor 5 to supply constant-pressure gas to the gas storage tank 4. The pressure of the gas storage tank 4 After the sensor 41 reaches a certain pressure, the pressurized gas enters the pressure kettle body 22, opens its high-level discharge valve 28, and the material is continuously discharged into the autoclave at a certain pressure through the depth discharge pipe 222, the high-level discharge valve 28, and the discharge pipe 14 of the integrated protective shell 1; while the premix feeder 2 is discharging, the high-level exhaust valve 25 and the feed valve 23 of the premix feeder 23 are opened, and the feed pipe of the integrated protective shell begins to fill the premix feeder 23 with material, and the premix feeder 23 starts the heating premixing program; as the material output in the premix feeder 2 reaches the lower limit of the liquid level switch 27, its air intake valve 24 and the high-level discharge valve 28 are closed, and the top exhaust valve 25 and the feed valve 23 are opened, and at the same time, the top air intake valve and the high-level discharge valve of the premix feeder 23 are opened, so as to realize the alternating continuous high-pressure output of materials from the premix feeder 2 and the premix feeder 23 to the autoclave. When the high-pressure feeding system stops working, the material is discharged through the drain valve 210 at the bottom.

[0039] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes based on the technical scheme and the utility model concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope of the present invention.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0041] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An integrated high-pressure feeding system for an autoclave, characterized in that: The invention comprises an integrated protective housing (1), a premix feeder 1 (2), a premix feeder 2 (3), an air storage tank (4) and an air compressor (5), wherein the premix feeder 1 (2), the premix feeder 2 (3), the air storage tank (4) and the air compressor (5) are fixed in the integrated protective housing (1) in sequence from left to right, and a feed pipe (13) and a discharge pipe (14) are provided in the integrated protective housing (1); The premix feeder 1 (2) and the premix feeder 2 (3) have the same structure, and both include a mechanical stirrer (21), a pressure kettle body (22), a heater (26), a liquid level switch (27), a temperature sensor (29), and a depth discharge pipe (222), wherein the pressure kettle body (22) is provided with the mechanical stirrer (21) and the depth discharge pipe (222), and the pressure kettle body (22) is externally sheathed with a heat-insulating layer (224), so that the pressure kettle body (2 2) and the insulation layer (224) form a heat exchange jacket (223); the pressure kettle body (22) is provided with a feed inlet and a vent at the top, and an outlet at the bottom, wherein the feed inlet is provided with a feed valve (23), the vent is provided with an air inlet valve (24) and an exhaust valve (25), and the outlet at the bottom is provided with an emptying valve (210), a liquid level switch (27) is fixed on the top of the pressure kettle body (22) and extends into the interior thereof, a heater (26) and a temperature sensor (2 9) pass through the insulation layer (224) and enter the heat exchange jacket (223), and a high-level discharge valve (28) is provided at the top of the deep liquid discharge pipe (222); the air compressor (5) is connected to the gas storage tank (4) through a pipeline, and a pressure sensor (41) is provided at the top of the gas storage tank (4). The gas outlet of the gas storage tank (4) is connected to the gas inlet valve (24) of the premix feeder 1 (2) and the premix feeder 2 (3) through pipelines, and the feed pipeline (13) is connected to the gas inlet valve (24) of the premix feeder 1 (2) and the premix feeder 2 (3) respectively. The first premix feeder (2) and the second premix feeder (3) are connected to the feed valves (23), and the discharge pipe (14) is respectively connected to the high-position discharge valves (28) of the first premix feeder (2) and the second premix feeder (3); the upper side wall of the insulation layer (224) is provided with an exhaust port (228), and the bottom is provided with a heat exchange medium inlet and outlet (227), wherein the exhaust port (228) and the heat exchange medium inlet and outlet (227) are both connected to the heat exchange jacket (223).

2. The integrated high-pressure feeding system for an autoclave according to claim 1, characterized in that: The air inlet valve (24) and the air exhaust valve (25) are respectively connected to the air vent of the pressure vessel body (22) through pipelines.

3. The integrated high-pressure feeding system for an autoclave according to claim 1, characterized in that: The pressure-bearing kettle body (22) has a built-in turbulence plate (221), and a kettle body support (226) is fixed at the bottom.

4. The integrated high-pressure feeding system for an autoclave according to claim 1, characterized in that: The mechanical agitator (21) comprises a motor, a stirring shaft and stirring blades, wherein the motor is fixed to the pressure kettle body (22) via a stirring seal support (225), the stirring shaft is connected to the driving shaft of the motor and is driven to rotate by the motor, and the stirring shaft passes through the top of the pressure kettle body (22) and extends into the pressure kettle body (22), and a plurality of blades are fixed to the bottom of the stirring shaft located in the pressure kettle body (22).

5. The integrated high-pressure feeding system for an autoclave according to claim 1, characterized in that: The heater (26) penetrates into the heat exchange jacket (223) from the bottom of the heat insulation layer (224), and the temperature sensor (29) penetrates into the heat exchange jacket (223) from below the side wall of the heat insulation layer (224).

6. The integrated high-pressure feeding system for an autoclave according to claim 1, characterized in that: The integrated protective shell (1) comprises a supporting frame (11) and a protective outer plate (12), wherein the supporting frame (11) is arranged inside the protective outer plate (12), and the premix feeder 1 (2), the premix feeder 2 (3), the gas storage tank (4), and the air compressor (5) are all fixed on the supporting frame (11).

7. The integrated high-pressure feeding system for an autoclave according to claim 1, characterized in that: The depth discharge pipe (222) is fixed on the top of the pressure kettle body (22) and extends into the interior thereof, and a high-position discharge valve (28) is provided on the depth discharge pipe (222) located above the pressure kettle body (22).

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