An alkylation reactor with an internal cleaning structure

Abstract

The utility model provides an alkylation reactor with an internal cleaning structure, comprising a reaction tank and a stirring motor, wherein the stirring motor is installed at the middle position of the upper end surface of the tank cover, a cooling component is arranged on the annular side surface of the reaction tank, and a flushing component for flushing and cleaning the inner wall of the reaction tank is arranged inside the tank cover. During the alkylation reaction of the reaction tank, the industrial water in the liquid storage tank is transported to the heat absorbing coil in sequence through the liquid passing pipe, the three-way valve and the liquid inlet pipe by starting a circulating water pump, so that the industrial water cools the reaction tank through the heat absorbing coil. When all the reactants in the reaction tank are discharged, the flow direction of the three-way valve is changed first, and then the circulating pump is used to transport the industrial water in the liquid storage tank through the liquid passing pipe and the bypass pipe to the guide pipe, and the guide pipe will divert the industrial water to multiple spray heads, so that the multiple spray heads spray the industrial water downward on the inner wall of the reaction tank for flushing and cleaning.

Description

Technical Field

[0001] The utility model relates to the technical field of alkylation reaction, in particular to an alkylation reactor with an internal cleaning structure. Background Art

[0002] Alkylation refers to the reaction of introducing alkyl groups (-R) into carbon, nitrogen, oxygen and other atoms in organic molecules, referred to as alkylation. Commonly used alkylating agents include olefins, halogenated alkanes, alkyl sulfates and alcohols. Alkylation is one of the important reactions in organic synthesis. Through alkylation, new carbon, carbon-heterovalent bonds can be formed, thereby extending the molecular skeleton of organic compounds, changing the chemical structure of the alkylated compounds, giving them new properties, and producing many organic chemicals with specific uses. In the process of alkylation, corresponding alkylation reactors are required for reaction operations.

[0003] An alkylation reactor provided by announcement number "CN213556995U" cools down the materials in the reactor through cold air to facilitate material fusion, and accelerates the fusion of the materials by stirring the materials with a stirring rod. The stirring rod is corrosion-resistant to avoid corrosion of the device by the fused materials, thereby protecting the safety and protection of the device.

[0004] However, the above technical solutions and the prior art have the following defects:

[0005] Although the alkylation reactor can cool the materials in the reactor by cold air to facilitate material fusion, the alkylation reactor is not provided with a corresponding cleaning structure, resulting in that the reactants adhering to the inner wall of the reactor cannot be cleaned in time, and staff are required to enter the reactor to clean it later, which is time-consuming and laborious. In addition, since the alkylation reactor introduces cold air into the reactor through a cold air inlet for cooling, and then discharges the gas inside the reactor through a cold air outlet, this cooling structure will cause the reaction gas inside the reactor to be discharged through the cold air outlet during actual use, polluting the surrounding environment, and has low practicality. Utility Model Content

[0006] The utility model aims to provide an alkylation reactor with an internal cleaning structure to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An alkylation reactor with an internal cleaning structure comprises a supporting chassis, a reaction tank, a liquid inlet valve, a tank cover, a stirring motor, a thermometer, a stirring rod and a gas inlet valve, wherein the upper end surface of the reaction tank is installed with the tank cover, the middle position of the upper end surface of the tank cover is installed with the stirring motor, the lower end of the stirring motor is installed with the stirring rod, the front side of the upper end surface of the tank cover is installed with a thermometer, the upper side of the right end surface of the reaction tank is connected with the liquid inlet valve, the upper side of the left end surface of the reaction tank is connected with the gas inlet valve, the bottom of the reaction tank is fixedly connected with the supporting chassis, the annular side surface of the reaction tank is provided with a cooling component, and the cooling component is used for absorbing and cooling the heat generated by the reaction tank, and the tank cover is provided with a flushing component for flushing and cleaning the inner wall of the reaction tank.

[0009] Preferably, the cooling component includes a heat absorbing coil, a liquid outlet pipe, a water-cooled condenser, a liquid inlet pipe, a liquid flow pipe, a circulating water pump, a liquid storage tank and a liquid guide pipe. The heat absorbing coil is fixedly connected to the annular side surface of the reaction tank, a liquid storage tank is placed on the left side of the reaction tank, a water-cooled condenser is fixedly connected to the upper end surface of the liquid storage tank, the inlet of the water-cooled condenser and the outlet of the heat absorbing coil are connected with the liquid outlet pipe, the outlet of the water-cooled condenser and the inlet of the liquid storage tank are connected with the liquid guide pipe, the inlet of the heat absorbing coil is connected with the liquid inlet pipe, a circulating water pump is installed on the lower side of the left end surface of the liquid storage tank, and the outlet of the circulating water pump is connected with the liquid flow pipe.

[0010] Preferably, the flushing assembly includes a guide pipe, a spray head, a bypass pipe and a three-way valve. A three-way valve is installed between the liquid inlet pipe and the liquid passage pipe. A bypass pipe is installed on the upper end of the three-way valve. The guide pipe is fixedly connected to the upper side of the inner part of the tank cover, and a spray head is provided at the lower end of the guide pipe.

[0011] Preferably, a cooling water inlet pipe is connected to the upper side of the annular side of the water-cooled condenser, and the cooling water inlet pipe is connected to the outlet of an external cooling water tower; a cooling water outlet pipe is connected to the lower side of the annular side of the water-cooled condenser, and the cooling water outlet pipe is connected to the inlet of an external cooling water tower; a protective shell is fixedly connected to the annular side of the reaction tank.

[0012] Preferably, a first observation window is installed on the upper side of the upper end surface of the liquid storage tank, a liquid replenishment valve is installed on the upper side of the front end surface of the liquid storage tank, and the liquid replenishment valve is connected to the outlet of the external industrial water storage tank through a pipeline, and a drain valve is installed on the lower side of the front end surface of the liquid storage tank, and the outlet of the drain valve is connected to the external wastewater treatment tank through a pipeline.

[0013] Preferably, a plurality of the spray heads are provided, and the specifications of the plurality of spray heads are the same, the plurality of spray heads are all inclined outward, and the three-way valve is respectively connected to the liquid passing pipe, the liquid inlet pipe and the bypass pipe.

[0014] Preferably, a first discharge valve is installed on the right side of the bottom of the reaction tank, a second discharge valve is installed on the left side of the bottom of the reaction tank, a gas discharge pipe is connected to the upper side of the front end surface of the reaction tank, and the outlet of the gas discharge pipe is connected to the inlet of the external gas recovery tank, and a second observation window is installed on the right side of the upper end surface of the tank cover.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model is used in the process of alkylation reaction in the reaction tank. By starting the circulating water pump, the industrial water in the liquid storage tank is transported to the heat absorbing coil through the liquid pipe, the three-way valve and the liquid inlet pipe in sequence, so that the industrial water can cool the reaction tank through the heat absorbing coil. In addition, the structure will not cause the reaction gas in the reaction tank to flow out during use, and the use safety is good;

[0017] 2. The utility model changes the flow direction of the three-way valve to connect the liquid pipe with the bypass pipe, and then uses the circulation pump to transport the industrial water inside the liquid storage tank through the liquid pipe and the bypass pipe to the guide pipe, and the guide pipe will divert the industrial water to multiple spray heads, so that the multiple spray heads can spray the industrial water downward on the inner wall of the reaction tank for flushing and cleaning, thereby reducing the labor intensity of the staff and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 It is a front cross-sectional view of the flushing component and the cooling component in the utility model;

[0020] Figure 3 It is a partial structural diagram of the cooling component in the utility model;

[0021] Figure 4 It is a structural diagram of the reaction tank in the utility model;

[0022] Figure 5 It is a partial structural diagram of the flushing component in the utility model.

[0023] In the figure: 1. supporting frame; 2. reaction tank; 21. first discharge valve; 22. second discharge valve; 23. gas discharge pipe; 3. liquid inlet valve; 4. tank cover; 41. second observation window; 5. stirring motor; 6. thermometer; 7. flushing assembly; 71. flow guide pipe; 72. spray head; 73. bypass pipe; 74. three-way valve; 8. cooling assembly; 81. protective shell; 82. heat absorbing coil; 83. liquid outlet pipe; 84. water-cooled condenser; 841. cooling water inlet pipe; 842. cooling water outlet pipe; 85. liquid inlet pipe; 86. liquid pipe; 87. circulating water pump; 88. liquid storage tank; 881. first observation window; 882. liquid replenishing valve; 883. discharge valve; 89. liquid guide pipe; 9. stirring rod; 10. gas inlet valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-5 , the utility model provides a technical solution:

[0026] Embodiment 1:

[0027] An alkylation reactor with an internal cleaning structure comprises a supporting frame 1, a reaction tank 2, a liquid inlet valve 3, a tank cover 4, a stirring motor 5, a thermometer 6, a stirring rod 9 and a gas inlet valve 10. The upper end surface of the reaction tank 2 is installed with a tank cover 4, which will block the upper end surface of the reaction tank 2. A stirring motor 5 is installed in the middle position of the upper end surface of the tank cover 4. The stirring motor 5 is a low-speed motor. A stirring rod 9 is installed at the lower end of the stirring motor 5. The stirring motor 5, which is a low-speed motor, will drive the stirring rod 9 to rotate at a low speed to stir the alkylation reactants in the reaction tank 2 when working, so as to accelerate the reaction of the alkylation reactants. In order to improve efficiency, a thermometer 6 is installed on the front side of the upper end face of the tank cover 4. The thermometer 6 will display the internal temperature of the reaction tank 2 in real time so that the staff can observe and record. A liquid inlet valve 3 is connected to the upper side of the right end face of the reaction tank 2. The inlet of the liquid inlet valve 3 is connected to the outlet of the external reaction liquid storage tank through a pipeline. The liquid inlet valve 3 is convenient for the staff to inject the required reaction liquid into the reaction tank 2. A gas inlet valve 10 is connected to the upper side of the left end face of the reaction tank 2. The inlet of the gas inlet valve 10 is connected to the outlet of the external reaction gas storage tank through a pipeline. The gas inlet valve 10 is convenient for the staff to inject the required reaction gas into the reaction tank 2.

[0028] A first discharge valve 21 is installed on the right side of the bottom of the reaction tank 2, and the outlet of the first discharge valve 21 is connected to the inlet of the external reaction material storage tank through a pipeline. When the first discharge valve 21 is opened, the reactants in the reaction tank 2 will be discharged to the inside of the external reaction material storage tank for temporary storage. A second discharge valve 22 is installed on the left side of the bottom of the reaction tank 2, and the outlet of the second discharge valve 22 is connected to the inlet of the external waste liquid treatment tank through a pipeline. When the second discharge valve 22 is opened, the flushing water in the reaction tank 2 will be discharged to the inside of the external waste liquid treatment tank for treatment. A gas discharge pipe 23 is connected to the upper side of the front end surface of the reaction tank 2, and the outlet of the gas discharge pipe 23 is connected to the inlet of the external gas recovery tank. The gas discharge pipe 23 is connected to the external gas recovery tank. A valve is installed between the gas recovery tanks, and the valve is convenient for the staff to control the on-off of the gas exhaust pipe 23. The gas exhaust pipe 23 will introduce the gas generated during the reaction process inside the reaction tank 2 into the external reaction gas storage tank for recovery. A second observation window 41 is installed on the right side of the upper end surface of the tank cover 4. The second observation window 41 is convenient for the staff to observe the internal situation of the reaction tank 2 in real time. The bottom of the reaction tank 2 is fixedly connected to a supporting frame 1, and the supporting frame 1 will firmly support the reaction tank 2. A cooling component 8 is arranged on the annular side of the reaction tank 2, and the cooling component 8 is used to adsorb and cool the heat generated by the reaction tank 2. A flushing component 7 for flushing and cleaning the inner wall of the reaction tank 2 is arranged inside the tank cover 4.

[0029] The cooling component 8 includes a heat absorbing coil 82, a liquid outlet pipe 83, a water-cooled condenser 84, a liquid inlet pipe 85, a liquid passage pipe 86, a circulating water pump 87, a liquid storage tank 88 and a liquid guide pipe 89. The heat absorbing coil 82 is fixedly connected to the annular side of the reaction tank 2. The heat absorbing coil 82 is connected to the liquid outlet pipe 83 and the liquid inlet pipe 85 by welding. The heat absorbing coil 82 is made of stainless steel coil. The heat absorbing coil 82 of the stainless steel coil is convenient for industrial water to absorb most of the heat of the reaction tank 2. A liquid storage tank 88 is placed on the left side of the reaction tank 2, and the liquid storage tank 88 will store industrial water for cooling.

[0030] A water-cooled condenser 84 is fixedly connected to the upper end surface of the liquid storage tank 88. The water-cooled condenser 84 will cool down the industrial hands flowing out through the liquid outlet pipe 83. Since the internal detailed structure and working principle of the water-cooled condenser 84 are relatively mature technologies in the prior art, they will not be described in detail here. The inlet of the water-cooled condenser 84 and the outlet of the heat absorption coil 82 are connected with a liquid outlet pipe 83. The liquid outlet pipe 83 will guide the industrial water after absorbing heat in the heat absorption coil 82 to the water-cooled condenser 84. The outlet of the water-cooled condenser 84 and the inlet of the liquid storage tank 88 are connected with a liquid guide pipe 89. The liquid guide pipe 89 will guide the industrial hands after cooling down by the water-cooled condenser 84 to the medicine storage box for recycling. The inlet of the heat absorption coil 82 is connected with a liquid inlet pipe 85. The liquid inlet pipe 85 will guide the industrial hands in the liquid pipe 86 to the heat absorption coil 82.

[0031] A circulating water pump 87 is installed at the lower side of the left end surface of the liquid storage tank 88. When the circulating water pump 87 is working, the industrial hand in the liquid storage tank 88 is transported to the liquid pipe 86. The outlet of the circulating water pump 87 is connected to the liquid pipe 86. The liquid pipe 86 guides the industrial hand to the three-way valve 74. The upper side of the annular side of the water-cooled condenser 84 is connected to a cooling water inlet pipe 841, and the cooling water inlet pipe 841 is connected to the outlet of the external cooling water tower. The cooling water inlet pipe 841 transfers the external cooling water tower cooling water to the cooling water tower. The cooled cooling water is directed to the inside of the water-cooled condenser 84 to cool it down. A cooling water outlet pipe 842 is connected to the lower side of the annular side of the water-cooled condenser 84, and the cooling water outlet pipe 842 is connected to the inlet of the external cooling water tower. The cooling water outlet pipe 842 will direct the cooling water after absorbing heat inside the water-cooled condenser 84 to the outside cooling water tower for recycling. A protective shell 81 is fixedly connected to the annular side of the reaction tank 2, and the protective shell 81 will protect the heat-absorbing coil 82.

[0032] A first observation window 881 is installed on the upper side of the front end of the liquid storage tank 88. The first observation window 881 allows the staff to observe the internal situation of the liquid storage tank 88 in real time. A liquid replenishing valve 882 is installed on the upper side of the front end surface of the liquid storage tank 88, and the liquid replenishing valve 882 is connected to the outlet of the external industrial water storage tank through a pipeline. The liquid replenishing valve 882 allows the staff to replenish industrial water into the liquid storage tank 88. A liquid drain valve 883 is installed on the lower side of the front end surface of the liquid storage tank 88, and the outlet of the liquid drain valve 883 is connected to the external wastewater treatment tank through a pipeline. The liquid drain valve 883 allows the staff to drain the industrial water that has not been used for a long time in the liquid storage tank 88 for replacement.

[0033] Embodiment 2:

[0034] On the basis of the first embodiment, in this embodiment, the flow direction of the three-way valve 74 is changed to connect the liquid pipe 86 with the bypass pipe 73, and then the industrial water inside the liquid storage tank 88 is transported to the guide pipe 71 through the liquid pipe 86 and the bypass pipe 73 by the circulation pump, and the guide pipe will divert the industrial water to multiple spray heads 72, so that the multiple spray heads 72 can spray the industrial water downward on the inner wall of the reaction tank 2 for flushing and cleaning, thereby reducing the labor intensity of the staff.

[0035] The flushing assembly 7 includes a guide pipe 71, a spray head 72, a bypass pipe 73 and a three-way valve 74. The three-way valve 74 is installed between the liquid inlet pipe 85 and the liquid passage pipe 86. The three-way valve 74 is connected to the liquid passage pipe 86, the liquid inlet pipe 85 and the bypass pipe 73 respectively. The three-way valve 74 facilitates the staff to change the flow direction of the industrial water in the liquid passage pipe 86. The bypass pipe 73 is installed on the upper end of the three-way valve 74. The bypass pipe 73 will guide the industrial water discharged upward by the three-way valve 74 to the guide pipe 71, and the upper side of the inner part of the tank cover 4 A guide pipe 71 is fixedly connected, and the guide pipe 71 is annular. The annular guide pipe 71 will divert industrial water to multiple spray heads 72. A spray head 72 is provided at the lower end of the guide pipe 71. There are multiple spray heads 72, and the specifications of the multiple spray heads 72 are the same. The multiple spray heads 72 are all inclined outward. The multiple outward-inclined spray heads 72 will spray the industrial water in the guide pipe 71 downward onto the inner wall of the reaction tank 2, so that the sprayed industrial water can rinse and clean the reactants remaining on the inner wall of the reaction tank 2.

[0036] Working principle: When performing the alkylation reaction, the worker first opens the liquid inlet valve 3 to inject the required external reaction liquid into the reaction tank 2, then opens the gas inlet valve 10 to inject the required reaction gas into the reaction tank 2, and then starts the stirring motor 5, so that the stirring motor 5 drives the stirring rod 9 to stir and mix the reaction liquid and reaction gas in the reaction tank 2, thereby accelerating the fusion of the reaction liquid and reaction gas; during the reaction process, the reaction tank 2 will generate heat. When the heat inside the reaction tank 2 reaches the upper limit value, the worker The operator starts the circulating water pump 87, so that the circulating water pump 87 transports the industrial water in the liquid storage tank 88 to the heat absorbing coil 82 through the liquid pipe 86, the three-way valve 74 and the liquid inlet pipe 85 in sequence, so that the industrial water can cool down the reaction tank 2 through the heat absorbing coil 82 to prevent the reaction tank 2 from being overheated and affecting the reaction effect. The liquid outlet pipe 83 will guide the industrial water after absorbing heat to the water-cooled condenser 84. At this time, the water-cooled condenser 84 will cool down the industrial water entering the interior, and the cooled industrial water will pass through the liquid guide pipe 89. The liquid flows into the liquid storage tank 88 again for recycling, so as to continuously cool down the reaction tank 2. When the reaction is finished, the staff first turns off the stirring motor 5 and the circulating water pump 87, and then opens the first discharge valve 21 to discharge the reaction materials in the reaction tank 2. When all the reaction materials in the reaction tank 2 are discharged, the staff first turns off the first discharge valve 21 and opens the second discharge valve 22, and then changes the flow direction of the three-way valve 74 to connect the liquid pipe 86 with the bypass pipe 73. At this time, the circulating pump is started again, so that the circulating pump can discharge the storage tank 2. The industrial water inside the liquid tank 88 is transported to the guide pipe 71 through the liquid pipe 86 and the bypass pipe 73, and the guide pipe will divert the industrial water to multiple spray heads 72. At this time, multiple spray heads 72 tilted outward will spray the industrial water downward on the inner wall of the reaction tank 2, so as to rinse and clean the reactants remaining on the inner wall of the reaction tank 2, and the waste liquid after flushing will be discharged to the outside through the second discharge valve 22. When the inner wall of the reaction tank 2 is rinsed clean, the staff will first turn off the circulating water pump 87, and then close the second discharge valve 22.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An alkylation reactor with an internal cleaning structure, comprising a supporting frame (1), a reaction tank (2), a liquid inlet valve (3), a tank cover (4), a stirring motor (5), a thermometer (6), a stirring rod (9) and a gas inlet valve (10), characterized in that: The upper end surface of the reaction tank (2) is provided with a tank cover (4), a stirring motor (5) is provided at the middle position of the upper end surface of the tank cover (4), and a stirring rod (9) is provided at the lower end of the stirring motor (5); A thermometer (6) is installed on the front side of the upper end face of the tank cover (4); a liquid inlet valve (3) is connected to the upper side of the right end face of the reaction tank (2); a gas inlet valve (10) is connected to the upper side of the left end face of the reaction tank (2); a supporting frame (1) is fixedly connected to the bottom of the reaction tank (2); a cooling component (8) is arranged on the annular side face of the reaction tank (2); and the cooling component (8) is used to absorb and cool the heat generated by the reaction tank (2); and a flushing component (7) is arranged inside the tank cover (4) for flushing and cleaning the inner wall of the reaction tank (2).

2. The alkylation reactor with an internal cleaning structure according to claim 1, characterized in that: The cooling component (8) comprises a heat absorbing coil (82), a liquid outlet pipe (83), a water-cooled condenser (84), a liquid inlet pipe (85), a liquid passage pipe (86), a circulating water pump (87), a liquid storage tank (88) and a liquid guide pipe (89); the heat absorbing coil (82) is fixedly connected to the annular side surface of the reaction tank (2); the liquid storage tank (88) is placed on the left side of the reaction tank (2); and the upper end surface of the liquid storage tank (88) is fixedly connected to the water-cooled condenser. The heat absorbing coil (82) is connected to the inlet of the water-cooled condenser (84) via a liquid outlet pipe (83), the outlet of the water-cooled condenser (84) and the inlet of a liquid storage tank (88) are connected via a liquid guide pipe (89), the inlet of the heat absorbing coil (82) is connected to a liquid inlet pipe (85), a circulating water pump (87) is installed on the lower side of the left end surface of the liquid storage tank (88), and the outlet of the circulating water pump (87) is connected to a liquid passing pipe (86).

3. The alkylation reactor with an internal cleaning structure according to claim 2, characterized in that: The flushing assembly (7) comprises a flow guide pipe (71), a spray head (72), a bypass pipe (73) and a three-way valve (74); the three-way valve (74) is installed between the liquid inlet pipe (85) and the liquid passage pipe (86); the bypass pipe (73) is installed at the upper end of the three-way valve (74); the flow guide pipe (71) is fixedly connected to the upper side of the interior of the tank cover (4); and the spray head (72) is provided at the lower end of the flow guide pipe (71).

4. The alkylation reactor with an internal cleaning structure according to claim 2, characterized in that: The upper side of the annular side of the water-cooled condenser (84) is connected to a cooling water inlet pipe (841), and the cooling water inlet pipe (841) is connected to an outlet of an external cooling water tower. The lower side of the annular side of the water-cooled condenser (84) is connected to a cooling water outlet pipe (842), and the cooling water outlet pipe (842) is connected to an inlet of an external cooling water tower. The annular side of the reaction tank (2) is fixedly connected to a protective shell (81).

5. The alkylation reactor with an internal cleaning structure according to claim 2, characterized in that: A first observation window (881) is installed on the front side of the upper end of the liquid storage tank (88); a liquid replenishing valve (882) is installed on the upper side of the front end of the liquid storage tank (88), and the liquid replenishing valve (882) is connected to the outlet of an external industrial water storage tank through a pipeline; a liquid discharge valve (883) is installed on the lower side of the front end of the liquid storage tank (88), and the outlet of the liquid discharge valve (883) is connected to an external wastewater treatment tank through a pipeline.

6. The alkylation reactor with an internal cleaning structure according to claim 3, characterized in that: A plurality of the spray heads (72) are provided, and the specifications of the plurality of spray heads (72) are the same. The plurality of spray heads (72) are all inclined outwards, and the three-way valve (74) is respectively connected to the liquid passage pipe (86), the liquid inlet pipe (85) and the bypass pipe (73).

7. The alkylation reactor with an internal cleaning structure according to claim 1, characterized in that: A first discharge valve (21) is installed on the right side of the bottom of the reaction tank (2), a second discharge valve (22) is installed on the left side of the bottom of the reaction tank (2), a gas discharge pipe (23) is connected to the upper side of the front end surface of the reaction tank (2), and the outlet of the gas discharge pipe (23) is connected to the inlet of the external gas recovery tank, and a second observation window (41) is installed on the right side of the upper end surface of the tank cover (4).

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