Refrigerant heat recycling system in vinyl chloride conversion process

Abstract

The utility model discloses a refrigerant heat recycling system in a vinyl chloride conversion process, which is characterized in that a jacket water outlet of a converter is communicated with an inlet of a hot water tower through a pipeline, a water outlet of the hot water tower is communicated with an inlet of a hot water pump through a pipeline, and an outlet of the hot water pump is divided into two paths through pipelines, one path is communicated with a jacket water inlet of the converter through a pipeline, the other path is communicated with a thermal medium inlet of the air preheater through a pipeline, and a thermal medium outlet of the air preheater is communicated with an inlet of the hot water tower through a pipeline. The utility model has the advantages that after a refrigerant in the conversion process of vinyl chloride absorbs reaction heat, the refrigerant enters the air preheater to heat and increase the temperature of dry air entering the radiator, so that the heat is recycled, the consumption of medium-pressure steam required by the radiator is reduced, and the effect of reducing energy consumption is realized; the temperature of circulating hot water in the hot water tower is reduced, the steam generation amount is reduced, water resource waste is reduced, and the resource utilization rate of the system is increased.

Description

Technical field:

[0001] The utility model relates to a heat recycling system, in particular to a refrigerant heat recycling system in a vinyl chloride conversion process. Background technology:

[0002] In the process of preparing PVC by the calcium carbide method, calcium carbide first reacts with water to generate acetylene gas, acetylene then reacts with hydrogen chloride to generate vinyl chloride, and finally vinyl chloride is polymerized to obtain PVC. The process of acetylene and hydrogen chloride reacting in the converter to generate vinyl chloride is an exothermic reaction. Therefore, the hot water in the water jacket of the converter as a refrigerant will take away the excess heat in the converter to ensure that the reaction temperature in the reactor is always 120-180°C; when the temperature of the refrigerant rises, a large amount of low-pressure steam will be generated. Since it cannot be effectively utilized, it will be discharged in the form of exhaust steam, resulting in a waste of water resources and heat, affecting the resource utilization and economic benefits of the system. At the same time, after polymerization, the PVC needs to be dried through a drying bed, and the air intake of the drying bed needs to use 0.8Mpa medium-pressure steam to preheat the air. Therefore, the consumption of medium-pressure steam is large, which increases the overall energy consumption of the system. Utility model content:

[0003] In order to solve the above problems, the purpose of the utility model is to provide a refrigerant heat recovery system in the vinyl chloride conversion process.

[0004] The utility model is implemented by the following technical solutions:

[0005] A refrigerant heat recovery system in a vinyl chloride conversion process, comprising a converter, a vinyl chloride refining unit, a polymerization kettle, a centrifuge, a drying bed, a hot water tower, a hot water pump, a blower, an air preheater, a medium-pressure steam source and a radiator;

[0006] The vinyl chloride outlet of the converter is connected to the vinyl chloride inlet of the vinyl chloride refining unit through a pipeline, the vinyl chloride outlet of the vinyl chloride refining unit is connected to the vinyl chloride inlet of the polymerization kettle through a pipeline, the discharge port of the polymerization kettle is connected to the inlet of the centrifuge through a pipeline, and the discharge port of the centrifuge is connected to the feed port of the drying bed through a pipeline;

[0007] The air outlet of the blower is connected to the air inlet of the air preheater through a pipeline, the air outlet of the air preheater is connected to the air inlet of the radiator through a pipeline, and the air outlet of the radiator is connected to the air inlet of the drying bed through a pipeline; the steam outlet of the medium-pressure steam source is connected to the heat medium inlet of the radiator;

[0008] The jacket water outlet of the converter is connected to the inlet of the hot water tower through a pipeline, the water outlet of the hot water tower is connected to the inlet of the hot water pump through a pipeline, the outlet of the hot water pump is divided into two paths through the pipeline, one path is connected to the jacket water inlet of the converter through a pipeline, and the other path is connected to the heat medium inlet of the air preheater through a pipeline, and the heat medium outlet of the air preheater is connected to the inlet of the hot water tower through a pipeline.

[0009] Furthermore, the outlet of the hot water pump is also connected to the inlet of the hot water tower through a reflux pipeline.

[0010] Furthermore, an air filter is provided at the air inlet of the blower.

[0011] Furthermore, the number of the air preheaters is two, the heat medium inlets of the two air preheaters are connected to the outlet of the hot water pump through a pipeline, the heat medium outlets of the two air preheaters are connected to the inlet of the hot water tower through a pipeline, and the air outlet of the first air preheater is connected to the air inlet of the second air preheater through a pipeline.

[0012] Advantages of the utility model:

[0013] The utility model allows the refrigerant in the vinyl chloride conversion process to enter the air preheater after absorbing the reaction heat to heat and increase the temperature of the dry air entering the radiator, thereby realizing heat recycling and reducing the consumption of medium-pressure steam required for the radiator, thereby achieving the effect of reducing energy consumption; the hot water after heat exchange is returned to the hot water tower, which can reduce the temperature of the circulating hot water in the hot water tower, reduce the amount of steam generated, and further reduce the exhaust steam emission at the top of the hot water tower, thereby reducing the waste of water resources and improving the resource utilization rate of the system. Description of the drawings:

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 Schematic diagram of system connection of this embodiment.

[0016] In the figure: converter 1, vinyl chloride refining unit 2, polymerization kettle 3, centrifuge 4, drying bed 5, hot water tower 6, hot water pump 7, air filter 8, blower 9, air preheater 10, medium-pressure steam source 11, radiator 12, reflux pipeline 13. Specific implementation method:

[0017] 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.

[0018] Embodiment 1:

[0019] like Figure 1 A refrigerant heat recovery system in a vinyl chloride conversion process shown includes a converter 1, a vinyl chloride refining unit 2, a polymerization kettle 3, a centrifuge 4, a drying bed 5, a hot water tower 6, a hot water pump 7, a blower 9, an air preheater 10, a medium-pressure steam source 11 and a radiator 12;

[0020] The vinyl chloride outlet of the converter 1 is connected to the vinyl chloride inlet of the vinyl chloride refining unit 2 through a pipeline, the vinyl chloride outlet of the vinyl chloride refining unit 2 is connected to the vinyl chloride inlet of the polymerization kettle 3 through a pipeline, the discharge port of the polymerization kettle 3 is connected to the inlet of the centrifuge 4 through a pipeline, and the discharge port of the centrifuge 4 is connected to the feed port of the drying bed 5 through a pipeline;

[0021] In this embodiment, there are two air preheaters 10. An air filter 8 is provided at the air inlet of the blower 9. The air outlet of the blower 9 is connected to the air inlet of the first air preheater 10 through a pipeline. The air outlet of the first air preheater 10 is connected to the air inlet of the second air preheater 10 through a pipeline. The air outlet of the second air preheater 10 is connected to the air inlet of the radiator 12 through a pipeline. The air outlet of the radiator 12 is connected to the air inlet of the drying bed 5 through a pipeline. The steam outlet of the medium-pressure steam source 11 is connected to the heat medium inlet of the radiator 12.

[0022] The jacket water outlet of the converter 1 is connected to the inlet of the hot water tower 6 through a pipeline, the water outlet of the hot water tower 6 is connected to the inlet of the hot water pump 7 through a pipeline, the outlet of the hot water pump 7 is connected to the jacket water inlet of the converter 1 through a pipeline, and the outlet of the hot water pump 7 is also connected to the inlet of the hot water tower 6 through a reflux pipeline 13. The heat medium inlets of the two air preheaters 10 are both connected to the outlets of the hot water pump 7 through pipelines, and the heat medium outlets of the two air preheaters 10 are both connected to the inlet of the hot water tower 6 through pipelines.

[0023] In this embodiment, the vinyl chloride refining unit 2 is an existing vinyl chloride refining system. The utility model does not improve the vinyl chloride refining system. Therefore, the specific equipment and connection relationship of the vinyl chloride refining system will not be described in detail here.

[0024] Job Description:

[0025] Acetylene reacts with hydrogen chloride in converter 1 to generate crude vinyl chloride, which is then refined by vinyl chloride refining unit 2 to obtain refined vinyl chloride, which is then used as a raw material to enter polymerization kettle 3 for polymerization reaction to obtain polyvinyl chloride monomer, which is separated by centrifuge 4 and dried by drying bed 5 to obtain finished PVC.

[0026] After absorbing the reaction heat, the hot water in the jacket of the converter 1 enters the hot water tower 6, and then is sent to the air preheater 10 through the hot water pump 7 to preheat the air entering the radiator 12. In this embodiment, by setting two air preheaters 10, the heat exchange time between hot water and air can be extended to achieve sufficient heat exchange and ensure that the temperature of the air entering the radiator 12 reaches above 50°C, thereby saving the medium-pressure steam consumption of the radiator 12, thereby achieving energy-saving effect. The hot water after heat exchange and cooling with the air is returned to the hot water tower 6, which can reduce the temperature of the hot water in the hot water tower 6, reduce the amount of steam generated, and continue to enter the jacket of the converter 1 as a refrigerant to absorb heat, thereby realizing circulation. When the system abnormality causes the converter 1 jacket or the air preheater 10 to be unable to receive the water output of the hot water pump 7, the water output of the hot water pump 7 can also be returned to the hot water tower 6 through the reflux pipeline 13.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A refrigerant heat recovery system in a vinyl chloride conversion process, characterized in that: It includes converter, vinyl chloride refining unit, polymerization kettle, centrifuge, drying bed, hot water tower, hot water pump, blower, air preheater, medium pressure steam source and radiator; The vinyl chloride outlet of the converter is connected to the vinyl chloride inlet of the vinyl chloride refining unit through a pipeline, the vinyl chloride outlet of the vinyl chloride refining unit is connected to the vinyl chloride inlet of the polymerization kettle through a pipeline, the discharge port of the polymerization kettle is connected to the inlet of the centrifuge through a pipeline, and the discharge port of the centrifuge is connected to the feed port of the drying bed through a pipeline; The air outlet of the blower is connected to the air inlet of the air preheater through a pipeline, the air outlet of the air preheater is connected to the air inlet of the radiator through a pipeline, and the air outlet of the radiator is connected to the air inlet of the drying bed through a pipeline; the steam outlet of the medium-pressure steam source is connected to the heat medium inlet of the radiator; The jacket water outlet of the converter is connected to the inlet of the hot water tower through a pipeline, the water outlet of the hot water tower is connected to the inlet of the hot water pump through a pipeline, the outlet of the hot water pump is divided into two paths through the pipeline, one path is connected to the jacket water inlet of the converter through a pipeline, and the other path is connected to the heat medium inlet of the air preheater through a pipeline, and the heat medium outlet of the air preheater is connected to the inlet of the hot water tower through a pipeline.

2. The refrigerant heat recovery system in the vinyl chloride conversion process according to claim 1, characterized in that: The outlet of the hot water pump is also connected to the inlet of the hot water tower through a reflux pipeline.

3. The refrigerant heat recovery system in the vinyl chloride conversion process according to claim 1, characterized in that: An air filter is provided at the air inlet of the blower.

4. The refrigerant heat recovery system in the vinyl chloride conversion process according to claim 1, characterized in that: There are two air preheaters, the heat medium inlets of the two air preheaters are connected to the outlet of the hot water pump through a pipeline, the heat medium outlets of the two air preheaters are connected to the inlet of the hot water tower through a pipeline, and the air outlet of the first air preheater is connected to the air inlet of the second air preheater through a pipeline.

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