External circulation self-suction type residual gas recycling reaction device

Abstract

The utility model discloses an external circulation self-suction type residual gas recycling reaction device which comprises a reaction kettle body, a stirring paddle is arranged in the reaction kettle body, and the stirring paddle consists of a titanium porous stirring paddle and a stirring rod; the stirring paddle provides stirring power through a variable frequency motor arranged at the top of the reaction kettle; a liquid outlet, a gas outlet, a liquid inlet and a residual gas inlet are formed in the reaction kettle body, the liquid outlet is formed in the upper part of the kettle body, the liquid outlet and the residual gas inlet are formed in the bottom of the kettle body, the liquid outlet is connected with a liquid inlet pipe, the residual gas inlet is connected with a gas inlet pipe, the gas inlet pipe is nested in the liquid inlet pipe, and a three-way pipe is mounted on the liquid inlet pipe. According to the utility model, the design of a self-suction hollow stirring paddle is replaced by the design of external circulation and a large-page porous stirring paddle, so that the corrosion of corrosive gas to the stirring paddle is reduced, the mechanical strength of the stirring paddle is improved, and the service life of reaction equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to a gas-liquid reaction device, in particular to a gas-liquid reaction device for self-use of surplus gas, which is mainly used for gas-liquid reaction of water purification in hydrometallurgy and chemical industry. Background Art

[0002] Gas-liquid reaction is widely used in many fields such as chemical industry, petrochemical industry, environment, pharmaceutical industry, light industry, etc. As a common chemical reaction, it is mainly realized in a gas-liquid reactor. For gas-liquid reaction, due to the gas mass transfer problem, a large amount of gas needs to be introduced to meet the higher reaction efficiency, but the extra gas needs to be absorbed by the absorbent or absorption equipment, thereby indirectly increasing the production cost. CN204656489U, CN107890847A and CN216093644U all reported self-priming gas-liquid reaction devices, but in order to further improve the utilization rate of the residual gas and the equipment maintenance cost, a set of external circulation self-priming residual gas recycling reaction devices was designed and processed. Utility Model Content

[0003] The utility model aims to improve the utilization rate of residual gas in gas-liquid reaction by self-priming, prolong the service life of stirring paddle by external circulation, reduce equipment maintenance cost and reduce the deterioration of air tightness induced by disassembly of equipment kettle body, etc.

[0004] The utility model discloses an external circulation self-priming residual gas recycling reaction device, comprising a reactor body, a stirring paddle installed in the reactor body, the stirring paddle is composed of a titanium porous stirring paddle and a stirring rod; the stirring paddle is provided with stirring power by a frequency conversion motor arranged on the top of the reactor, and a polytetrafluoroethylene mechanical sealing plug is adopted to seal the stirring paddle and the reactor body; a liquid outlet, a gas outlet, a liquid inlet and a residual gas inlet are arranged on the reactor body, wherein the liquid outlet is arranged on the upper part of the reactor body, the liquid outlet and the residual gas inlet are arranged on the bottom of the reactor body, the liquid outlet is connected with a liquid inlet pipe, the residual gas inlet is connected with an air inlet pipe, the air inlet pipe is nested inside the liquid inlet pipe, a three-way pipe is arranged on the liquid inlet pipe, which can not only ensure the feeding of the residual gas-containing liquid but also serve as a discharge pipe; the gas outlet is arranged on the flange at the top of the reactor, the gas outlet is connected with the residual gas inlet through a gas external circulation pipe, an emptying pipe is arranged on the gas external circulation pipe, and a valve is arranged on the emptying pipe to control the residual gas circulation; for the convenience of maintenance, the reactor body is connected by a flange.

[0005] The liquid outlet is arranged at the upper middle part of the reactor body, which is conducive to the full gas-liquid separation of the residual gas carried by the liquid.

[0006] The stirring paddle adopts a large-page titanium porous stirring paddle with 4-6 blades. The large-page titanium porous stirring paddle ensures that a slight negative pressure is formed at the bottom center of the reactor to facilitate the introduction of residual gas and the full mixing of gas and liquid, thereby improving the utilization rate of residual gas.

[0007] In order to improve the mechanical strength of the stirring paddle, the stirring rod is made of solid titanium instead of the hollow design of the self-priming stirring paddle.

[0008] In order to ensure the recycling of residual gas, the residual gas is led from the top of the reactor to the bottom of the reactor through external circulation, and re-enters the system from the bottom of the reactor.

[0009] The utility model has the following advantages over the prior art:

[0010] By replacing the self-priming hollow stirring paddle design with an external circulation and a large-page porous stirring paddle design, the corrosion of the stirring paddle by corrosive gases such as hydrogen sulfide, chlorine, and hydrogen chloride gases is reduced, the mechanical strength of the stirring paddle is increased, and the service life of the reaction equipment is extended; the external circulation design is adopted to introduce the residual gas from the bottom of the reaction equipment, which increases the residence time of the gas in the liquid; the external circulation design reduces the maintenance cost of gas corrosion to the reaction equipment and reduces the technical difficulty of equipment maintenance; the selection of a large-page porous titanium plate stirring paddle is conducive to forming a slight negative pressure at the bottom center of the reactor and extending the reaction time of the gas in the liquid, thereby improving the utilization rate of the residual gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the waste gas recycling reaction device of the utility model;

[0012] In the figure: 1- frequency conversion motor, 2- PTFE mechanical seal, 3- flange cover, 4- reactor body, 5- exhaust port, 6- drain port, 7- gas external circulation pipe, 8- liquid outlet, 9- stirring paddle, 10- liquid inlet, 11- residual gas inlet pipe, 12- three-way pipe, L-1 is a venturi gas-liquid mixer, L-2 is a primary chlorine gas recycling reaction device, L-3 is a secondary chlorine gas recycling reaction device, and L-4 is a tertiary chlorine gas recycling reaction device. DETAILED DESCRIPTION

[0013] The following is combined with Figure 1 The structure and working process of the gas-liquid reaction device of the present invention are further explained through the operation of purifying and removing lead from nickel electrolyte.

[0014] like Figure 1As shown, an external circulation self-priming residual gas recycling reaction device is installed with a stirring paddle 9 in the reactor body 4, and the stirring paddle 9 and the reactor body 4 are sealed by a PTFE mechanical seal plug 2. The stirring paddle 9 is composed of a central solid stirring rod and 4-6 large-page porous titanium plates. The stirring paddle is provided with stirring power by a variable frequency motor 1 arranged on the top of the reactor. The reactor body 4 and the flange 3 together form a closed gas-liquid reaction chamber. The reactor is provided with a liquid outlet 8, a gas outlet 5, a liquid inlet 10 and a residual gas inlet 11. The liquid outlet 8 is arranged at the upper part of the kettle body, and the liquid outlet 8 and the residual gas inlet 11 are arranged at the bottom of the kettle body. The liquid outlet 8 is connected to the liquid inlet pipe, and the residual gas inlet 11 is connected to the air inlet pipe. The air inlet pipe is nested inside the liquid inlet pipe. A three-way pipe 12 is installed on the liquid inlet pipe. The first through-tube of the three-way pipe is connected to the liquid inlet pipe, and liquid is fed into the liquid inlet pipe through the second through-tube. The third through-tube at the bottom is used as a discharge pipe. The gas outlet 5 is arranged on the flange at the top of the reactor. The gas outlet 5 is connected to the residual gas inlet 11 through the gas external circulation pipe 7. The gas external circulation pipe 7 is provided with an emptying pipe 6, and the emptying pipe 6 is provided with an exhaust valve for controlling the residual gas circulation. After the unreacted residual gas is separated into gas and liquid in the reactor body 4, it enters the reaction system again at the residual gas inlet 11 at the bottom of the reactor through the gas outlet 5 and the gas external circulation pipe 7. When the system is stopped, the liquid in the reactor can be discharged from the system through the discharge pipe.

[0015] After the nickel electrolyte and chlorine gas of the mixed acid system (sulfuric acid system and chlorine system) are mixed in the gas-liquid mixer, they enter the reactor through the liquid inlet 10 at the bottom of the residual gas recycling device, and a deep gas-liquid mixing reaction is carried out in the chlorine recycling reaction device. The residual gas that has not reacted completely is led from the top of the reactor to the bottom of the reactor through external circulation, and the residual gas enters the reactor body again through the gas outlet 5, the gas external circulation pipe 7, the air inlet pipe, and the residual gas inlet 11 for recycling. Under the violent stirring action of the stirring paddle 9, the chlorine-containing solution and the residual chlorine are contacted again and fully reacted; after the reaction, the chlorine-containing solution is degassed near the height of the liquid outlet 8, the residual chlorine enters the top and the liquid enters the cobalt removal chute through the liquid outlet 8; as the solution continues to enter, the residual chlorine enters the residual gas inlet 11 again through the gas outlet 5 and the gas external circulation pipe 7, and the gas-liquid reaction is circulated. The solution overflowing into the cobalt removal chute is precipitated after adjusting the pH with an alkaline solution to obtain the corresponding nickel-cobalt slag. The tail gas is absorbed by a sodium hydroxide solution. The solution after absorption is tested and analyzed and it is found that the chlorine content in the tail gas is less than 0.5% of the total amount of chlorine introduced, and the amount of nickel-cobalt slag is reduced by about 30% compared with the existing technology, thereby improving the efficiency of chlorine purification and cobalt removal.

Claims

1. An external circulation self-priming residual gas recycling reaction device, characterized in that: The invention comprises a reactor body (4), a stirring paddle (9) installed in the reactor body, the stirring paddle (9) being composed of a titanium porous stirring paddle and a stirring rod; the stirring paddle is provided with stirring power by a variable frequency motor (1) arranged at the top of the reactor; a liquid outlet (8), a gas outlet (5), a liquid inlet (10) and a residual gas inlet (11) are arranged on the reactor body; the liquid outlet (8) is arranged at the top of the reactor body, the liquid outlet (8) and the residual gas inlet (11) are arranged at the bottom of the reactor body, the liquid outlet (8) is connected to a liquid inlet pipe, the residual gas inlet (11) is connected to an air inlet pipe, the air inlet pipe is nested inside the liquid inlet pipe, and a three-way pipe (12) is installed on the liquid inlet pipe; the gas outlet (5) is arranged on the flange at the top of the reactor, the gas outlet (5) is connected to the residual gas inlet (11) through a gas external circulation pipe (7), and an exhaust pipe (6) is arranged on the gas external circulation pipe (7).

2. The external circulation self-priming residual gas recycling reaction device as claimed in claim 1, characterized in that: The liquid outlet (8) is arranged at a position slightly above the middle of the reactor body, which is conducive to sufficient gas-liquid separation of the residual gas carried by the liquid.

3. The external circulation self-priming residual gas recycling reaction device as claimed in claim 1, characterized in that: The stirring paddle (9) is a large-page titanium porous stirring paddle, and the number of blades of the stirring paddle is 4-6. The large-page titanium porous stirring paddle ensures that a slight negative pressure is formed at the bottom center of the reactor to facilitate the introduction of residual gas and the full mixing of gas and liquid.

4. The external circulation self-priming residual gas recycling reaction device as claimed in claim 1, characterized in that: The stirring rod of the stirring paddle (9) is made of solid titanium.

5. The external circulation self-priming residual gas recycling reaction device as claimed in claim 1, characterized in that: The stirring blade and the reactor body are sealed with a polytetrafluoroethylene mechanical seal plug (2).

6. The external circulation self-priming residual gas recycling reaction device as claimed in claim 1, characterized in that: An exhaust valve is installed on the exhaust pipe (6) to control the circulation of residual gas.

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