PA6 polymerization steam heat recovery system

Abstract

The utility model belongs to the technical field of material recovery, and particularly discloses a PA6 polymerization steam heat recovery system which comprises a washing tower, a shell-and-tube heat exchanger, a condenser and a water-sealed tank, the washing tower is connected with a reaction kettle, the shell-and-tube heat exchanger is connected with the washing tower through a first valve, and the condenser is connected with the water-sealed tank through a second valve. The shell-and-tube heat exchanger is connected with the condenser through a third valve, and the condenser is connected with the water-sealed tank. According to the utility model, the power consumption of circulating cooling water and the consumption of steam can be reduced, the load of the circulating cooling water is reduced, the power consumption is saved, and the use of heating steam can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of material recovery, and in particular relates to a PA6 polymerization steam heat recovery system. Background Art

[0002] Nylon 6 (PA6) is a wear-resistant, corrosion-resistant, high-strength polymer widely used in textile, automotive, electrical, aviation and other fields. In the PA6 production process, the reaction materials will contain a certain amount of water to participate in the reaction. After entering the polymerization reactor, due to the high temperature of the reactor, the water in the materials will evaporate, and a large amount of high-temperature process steam will be generated. These steams are generally cooled by circulating cooling water, and the hot water required in the production process needs steam heating. Therefore, how to reasonably use these high-temperature steams can not only reduce the load of circulating cooling water and save electricity consumption, but also reduce the use of heating steam. Saving energy consumption has become a focus of the industry. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a PA6 polymerization steam heat recovery system.

[0004] To achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is: a PA6 polymerization steam heat recovery system, including a washing tower, a shell and tube heat exchanger, a condenser and a water seal tank, the washing tower is connected to the reactor, the shell and tube heat exchanger is connected to the washing tower through a first valve, the shell and tube heat exchanger is connected to the condenser through a third valve, and the condenser is connected to the water seal tank.

[0005] In a preferred embodiment of the present invention, the PA6 polymerization steam heat recovery system further comprises a second valve, which connects the first valve and the third valve in series.

[0006] In a preferred embodiment of the present invention, the shell and tube heat exchanger is used for heat exchange between hot water and high-temperature steam.

[0007] In a preferred embodiment of the present invention, the steam pipes, valves, and shell and tube heat exchangers of the PA6 polymerization steam heat recovery system are all made of stainless steel, and the hot water pipes are made of carbon steel.

[0008] Working process: open the first valve and the third valve, close the second valve, the high-temperature steam generated by the heating of the reactor is first washed by the washing tower, and then enters the shell and tube heat exchanger through the steam pipe (the shell and tube heat exchanger contains hot water provided by the hot water circulation pump) to exchange heat with the hot water, part of the high-temperature steam is condensed, and finally enters the condenser together, is completely condensed by the circulating cooling water inside the condenser, and then returns to the water seal tank, completing the entire waste heat recovery process.

[0009] Compared with the background technology, this technical solution has the following advantages:

[0010] The utility model can reduce the power consumption of circulating cooling water and the consumption of steam, lighten the load of circulating cooling water, save power consumption, and reduce the use of heating steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of the PA6 polymerization steam heat recovery system of the utility model.

[0013] In the figure: 1-reactor, 2-washing tower, 3-shell and tube heat exchanger, 4-condenser, 5-water seal tank, 6-hot water, 7-circulating cooling water, V1-first valve, V2-second valve, V3-third valve. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the utility model more clear, the technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments. The implementation method can have different forms and should not be understood as being limited to the description set forth herein. The same reference numerals in the text always represent the same elements, and similar reference numerals represent similar elements.

[0015] like Figure 1 As shown, the PA6 polymerization steam heat recovery system of the utility model includes a washing tower 2, a shell and tube heat exchanger 3, a condenser 4 and a water seal tank 5. The washing tower 2 is connected to the reactor 1, the shell and tube heat exchanger 3 is connected to the washing tower 2 through a first valve V1, the shell and tube heat exchanger 3 is connected to the condenser 4 through a third valve V3, and the condenser 4 is connected to the water seal tank 5. The PA6 polymerization steam heat recovery system also includes a second valve V2, which connects the first valve V1 and the third valve V3 in series. The shell and tube heat exchanger 3 is used for heat exchange between hot water 6 and high-temperature steam. The steam pipe, valve, and shell and tube heat exchanger of the PA6 polymerization steam heat recovery system are all made of stainless steel, and the hot water pipe is made of carbon steel.

[0016] Open the first valve V1 and the third valve V3, close the second valve V2, and the reactor 1 generates a large amount of high-temperature steam after heating. The high-temperature steam first passes through the washing tower 2 for washing, and then enters the shell and tube heat exchanger 3 through the steam pipe to exchange heat with the hot water 6 inside the shell heat exchanger 3. The hot water 6 absorbs part of the heat of the high-temperature steam, so that part of the high-temperature steam is condensed, and finally enters the condenser 4 together, is completely condensed by the circulating cooling water 7 therein, and then flows into the water seal tank 5. When the temperature of the hot water 6 reaches the design temperature and no overheating is required, the second valve V2 can be opened to allow part of the steam to be directly cooled with cooling water.

[0017] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope covered by the present invention.

Claims

1. A PA6 polymerization steam heat recovery system, characterized in that: It includes a washing tower, a shell and tube heat exchanger, a condenser and a water seal tank. The washing tower is connected to the reactor, the shell and tube heat exchanger is connected to the washing tower through a first valve, the shell and tube heat exchanger is connected to the condenser through a third valve, and the condenser is connected to the water seal tank.

2. The PA6 polymerization steam heat recovery system according to claim 1, characterized in that: A second valve is also included, which connects the first valve and the third valve in series.

3. The PA6 polymerization steam heat recovery system according to claim 1, characterized in that: The shell and tube heat exchanger is used for heat exchange between hot water and high-temperature steam.

4. The PA6 polymerization steam heat recovery system according to claim 1, characterized in that: The steam pipes, valves, and shell and tube heat exchangers of the PA6 polymerization steam heat recovery system are all made of stainless steel, and the hot water pipes are made of carbon steel.

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