Hoisting type heat exchanger

Abstract

The utility model relates to a hoisting type heat exchanger, which comprises a connecting pipeline, a spray tower and a lifting device, the plurality of heat exchange pipelines cover the connecting pipeline; the air inlet pipe is connected with the top of the heat exchange pipeline and a fan; the air outlet pipe is connected with the bottom of the heat exchange pipeline and the heat preservation jacket of the leaching tower; wherein the bottom end of the connecting pipeline is connected with the fused salt chlorination furnace, and the top end of the connecting pipeline is connected with the leaching tower; due to the fact that the temperature of gas-phase aluminum trichloride and impurities generated by the fused salt chlorination furnace is high, when the aluminum trichloride passes through the connecting pipeline, the hoisting type heat exchanger works, namely the draught fan works, external air is subjected to heat exchange through the air inlet pipe and the heat exchange pipeline, the aluminum trichloride and the impurities are cooled, and heat obtained after heat exchange is introduced into the heat preservation jacket of the leaching tower through the air outlet pipe. The leaching tower is heated, and the temperature of the leaching tower is kept at 200-250 DEG C;

Description

Technical Field

[0001] The utility model relates to a production process of anhydrous aluminum trichloride, in particular to a hoisting type heat exchanger. Background Art

[0002] The mixed molten salt is added into a molten salt chlorination furnace, aluminum oxide powder and petroleum coke powder are added, and chlorine gas is introduced for chlorination reaction to produce gaseous aluminum trichloride. During the process that the aluminum trichloride passes through a scrubbing tower, there must be molten salt containing impurities; the conventional solution is to separate the molten salt by means of scrubbing. However, due to the large content, the scrubbed molten salt will block at the bottom of the scrubbing tower and cannot be discharged.

[0003] In addition, in order to obtain better crystallization of aluminum trichloride, it is necessary to ensure that the temperature in the scrubbing tower is 200-250 degrees Celsius. The conventional solution is to externally add a heater to ensure the temperature in the scrubbing tower, which increases the energy consumption.

[0004] In summary, how to filter the molten salt and maintain the temperature in the scrubbing tower has become a problem that needs to be solved urgently by researchers in this field. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is: how to filter the molten salt and maintain the temperature in the scrubbing tower.

[0006] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0007] The utility model is a hoisting type heat exchanger, including: a connecting pipe, which is inclined to connect a molten salt chlorination furnace and a scrubbing tower; a plurality of heat exchange pipes, which cover the connecting pipe; an air inlet pipe, which connects the top of the heat exchange pipes and a fan; an air outlet pipe, which connects the bottom of the heat exchange pipes and a heat preservation jacket of the scrubbing tower; wherein, the bottom end of the connecting pipe is connected to the molten salt chlorination furnace, and the top end is connected to the scrubbing tower.

[0008] In this solution, since the gaseous aluminum trichloride and impurities generated by the molten salt chlorination furnace have a high temperature, when the aluminum trichloride passes through the connecting pipe, the hoisting type heat exchanger works, that is, the fan works, and the outside air is heated through the air inlet pipe and the heat exchange pipes, and the aluminum trichloride and impurities are cooled. The heat after heat exchange is introduced into the heat preservation jacket of the scrubbing tower through the air outlet pipe to heat the scrubbing tower and keep the temperature of the scrubbing tower at 200-250 degrees Celsius.

[0009] In addition, since the heat exchange pipes are cooled, the high-boiling-point and impurity-containing molten salt will flow back and re-enter the molten salt chlorination furnace under the action of gravity, reducing the content of the molten salt entering the scrubbing tower and reducing the possibility of blockage of the molten salt scrubbing.

[0010] When the temperature of the scrubbing tower is detected to decrease, increase the air volume of the fan, so that the heat entering the jacket from the outlet duct increases; conversely, when the temperature of the scrubbing tower is detected to be too high, decrease the air volume of the fan, so that the heat entering the jacket from the outlet duct decreases;

[0011] To ensure that the air entering the heat exchanger is dry, a dehumidifier is also provided at the inlet of the fan of the present utility model;

[0012] By setting the dehumidifier, the dryness of the air entering the heat exchanger is ensured.

[0013] When the scrubbing tower and the connecting pipe are not working, how to maintain the temperature of the scrubbing tower and the connecting pipe. The present utility model adopts a main pipe arranged at the outlet of the fan; the main pipe is connected to the inlet duct through a first valve; the main pipe is connected to the heat exchange pipe through a heating pipe; a second valve and a heater are arranged on the heating pipe;

[0014] When the connecting pipe needs to be cooled; the first valve is opened and the second valve is closed, and the air enters the heat exchange pipe through the main pipe and the inlet duct;

[0015] When the connecting pipe and the scrubbing tower are shut down, it is necessary to maintain the temperature of the connecting pipe and the scrubbing tower. The first valve is closed and the second valve is opened, and the air enters the heat exchange pipe through the main pipe and the heating pipe to maintain the temperature of the connecting pipe and the scrubbing tower.

[0016] The beneficial effects of the present utility model: The present utility model is a hoisting type heat exchanger. In this scheme, since the temperature of the gaseous aluminum trichloride and impurities generated by the molten salt chlorination furnace is relatively high, when the aluminum trichloride passes through the connecting pipe, the hoisting type heat exchanger works, that is, the fan works, and the outside air is heat exchanged through the inlet duct and the heat exchange pipe to cool the aluminum trichloride and impurities. The heat after heat exchange is introduced into the heat preservation jacket of the scrubbing tower through the outlet duct to heat the scrubbing tower, and the temperature of the scrubbing tower is maintained at 200-250 degrees Celsius without an external heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] In the figure: 1-connecting pipe, 2-molten salt chlorination furnace, 3-scrubbing tower, 4-heat exchange pipe, 5-inlet duct, 6-fan, 7-outlet duct, 8-dehumidifier, 9-main pipe, 10-first valve, 11-heating pipe, 12-second valve, 13-heater, 31-heat preservation jacket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will now be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0021] As Figure 1 shown, the present utility model is a hoisting type heat exchanger, including: a connecting pipe 1, which is obliquely connected to a molten salt chlorination furnace 2 and a scrubbing tower 3; a plurality of heat exchange pipes 4, which cover the connecting pipe 1; an air inlet pipe 5, which is connected to the top of the heat exchange pipe 4 and a fan 6; an air outlet pipe 7, which is connected to the bottom of the heat exchange pipe 4 and the heat preservation jacket 31 of the scrubbing tower 3; wherein, the bottom end of the connecting pipe 1 is connected to the molten salt chlorination furnace 2, and the top end is connected to the scrubbing tower 1;

[0022] In this solution, since the temperature of the gaseous aluminum trichloride and impurities generated by the molten salt chlorination furnace is relatively high, when the aluminum trichloride passes through the connecting pipe, the hoisting type heat exchanger works, that is, the fan works, and the outside air is heat-exchanged through the air inlet pipe and the heat exchange pipe to cool the aluminum trichloride and impurities. The heat after heat exchange is introduced into the heat preservation jacket of the scrubbing tower through the air outlet pipe to heat the scrubbing tower and keep the temperature of the scrubbing tower at 200-250 degrees Celsius;

[0023] In addition, since the heat exchange pipes are heat-exchanged and cooled, the high-boiling-point and impurity-containing molten salt will flow back and re-enter the molten salt chlorination furnace under the action of gravity, reducing the content of the molten salt entering the scrubbing tower and reducing the possibility of molten salt scrubbing blockage;

[0024] When it is detected that the temperature of the scrubbing tower decreases, the air volume of the fan is increased, so that the heat entering the jacket from the air outlet pipe increases; conversely, when it is detected that the temperature of the scrubbing tower is too high, the air volume of the fan is decreased, so that the heat entering the jacket from the air outlet pipe decreases;

[0025] As Figure 1 shown, in order to ensure that the air entering the heat exchanger is dry, a dehumidifier 8 is also provided at the inlet of the fan 6 of the present utility model;

[0026] By setting the dehumidifier, the dryness of the air entering the heat exchanger is ensured.

[0027] As Figure 1 shown, when the scrubbing tower and the connecting pipe are not working, how to maintain the temperature of the scrubbing tower 3 and the connecting pipe 1, the present utility model adopts a main pipe 9 provided at the outlet of the fan 6; the main pipe 9 is connected to the air inlet pipe 5 through a first valve 10; the main pipe 9 is connected to the heat exchange pipe 4 through a heating pipe 11; a second valve 12 and a heater 13 are provided on the heating pipe 11;

[0028] When it is necessary to cool the connecting pipe; the first valve is opened and the second valve is closed, and the air enters the heat exchange pipe through the main pipe and the air inlet pipe;

[0029] When the connecting pipeline and the scrubbing tower are shut down, it is necessary to maintain the temperature of the connecting pipeline and the scrubbing tower. The first valve is closed and the second valve is opened. The air enters the heat exchange pipeline through the main pipe and the heating pipe to maintain the temperature of the connecting pipeline and the scrubbing tower.

[0030] Inspired by the ideal embodiments of the present utility model described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hoisting type heat exchanger, characterized in that, Including: A connecting pipe, which is obliquely connected to a molten salt chlorination furnace and a scrubbing tower; A plurality of heat exchange pipes, which cover the connecting pipe; An air inlet pipe, which is connected to the top of the heat exchange pipe and a blower; An air outlet pipe, which is connected to the bottom of the heat exchange pipe and the heat preservation jacket of the scrubbing tower; Wherein, the bottom end of the connecting pipe is connected to the molten salt chlorination furnace, and the top end is connected to the scrubbing tower.

2. The lifting heat exchanger according to claim 1, characterized in that, A dehumidifier is also arranged at the inlet of the blower.

3. The lifting heat exchanger according to claim 1, wherein, A main pipe is arranged at the outlet of the blower; The main pipe is connected to the air inlet pipe through a first valve; The main pipe is connected to the heat exchange pipe through a heating pipe; A second valve and a heater are arranged on the heating pipe.

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