Rapid cooling reaction kettle for melamine resin production

Abstract

The utility model relates to the technical field of melamine resin production, and discloses a rapid cooling reaction kettle for melamine resin production. The multiple cooling effects of cooling the reaction kettle are achieved through cooperation of the first heat exchange coil pipe, the second heat exchange coil pipe, the first water supply pipe, the second water supply pipe and other parts, and it is guaranteed that the interior of the reaction kettle is rapidly cooled. By arranging the cooling water tank and arranging the refrigeration equipment at the cooling water tank, water in the cooling water tank can be continuously cooled, and the process occurs in the reaction stage of the reaction kettle, so that the cooling water tank of the reaction kettle can continuously prestore low-temperature cooling water in the reaction stage; and then water in the cooling water tank is introduced into the first heat exchange coil pipe for heat exchange through a second water pump and a second water supply pipe, and the water in the cooling water tank is low-temperature water, so that heat exchange can be quickly completed on the outer side wall of the reaction kettle. The heat exchange valve has multiple heat exchange modes with different efficiencies, and the multiple heat exchange modes can be conveniently switched and adjusted only through the valve body.

Description

Technical Field

[0001] This application relates to the field of melamine resin production technology, specifically to a rapid cooling reactor for melamine resin production. Background Technology

[0002] Melamine resin has a variety of applications, such as decorative laminates, tableware and food packaging, coatings and adhesives. Its production process involves raw material preparation, hydroxymethylation, polycondensation, termination and modification, post-treatment, and curing. The termination stage after polycondensation typically requires rapid cooling, a critical control step in melamine resin production. The ability to achieve rapid cooling directly impacts product quality. If cooling is not timely, the reaction will continue, leading to premature cross-linking of the resin (excessively large prepolymer molecular weight), affecting subsequent processing properties (such as decreased flowability), a sharp increase in resin viscosity, and even potential gelation (curing), resulting in product spoilage. However, existing reaction vessels cannot achieve rapid cooling. Utility Model Content

[0003] In view of the above problems, this application provides a rapid cooling reactor for melamine resin production, which can achieve rapid cooling inside the reactor, thereby avoiding a series of problems caused by failure to cool down in time during the melamine resin production process.

[0004] According to one aspect of the embodiments of this application, a rapid cooling reactor for melamine resin production is provided. The rapid cooling reactor for melamine resin production includes a reactor body, a water storage tank, and a cooling water tank. A cooling jacket is provided on the outer periphery of the reactor body. The inner wall of the cooling jacket and the outer wall of the reactor body together enclose a heat exchange cavity. A first heat exchange coil and a second heat exchange coil are spirally arranged within the heat exchange cavity. The first end of the first heat exchange coil extends to the outer periphery of the cooling jacket and is connected to a first water inlet connector. The first end of the second heat exchange coil extends to the outer periphery of the cooling jacket and is connected to a second water inlet connector. The ends of the first heat exchange coil and the second heat exchange coil respectively extend... The first water inlet connector extends to the outer end of the cooling jacket and is connected to a first water outlet pipe and a second water outlet pipe, respectively. One end of the first water inlet connector is connected to a tee pipe, which is also connected to a first water supply pipe and a second water supply pipe. A first solenoid valve and a second solenoid valve are respectively installed on the first water supply pipe and the second water supply pipe. The end of the first water supply pipe extends into the water storage tank and is equipped with a first water pump. The end of the second water supply pipe extends into the cooling water tank and is connected to a second water pump. The second water inlet connector is connected to a third water supply pipe, which extends into the water storage tank and is connected to a third water pump.

[0005] In some embodiments, the end of the second water inlet connector away from the cooling jacket is connected to a multi-port connector, the third water supply pipe is connected to the inner cavity of the multi-port connector, the multi-port connector is also connected to a fourth water supply pipe, the end of the fourth water supply pipe extends to the cooling water pool and is connected to a fourth water pump, and a third solenoid valve and a fourth solenoid valve are respectively provided on the third water supply pipe and the fourth water supply pipe.

[0006] In some embodiments, the outer periphery of the reactor body is provided with a spiral heat dissipation fin ring that matches the first heat exchange coil and the second heat exchange coil.

[0007] In some embodiments, the cross-sectional area of ​​the first heat exchange coil is smaller than the cross-sectional area of ​​the second heat exchange coil.

[0008] In some embodiments, an extraction pump is included, the suction end of which is connected to the bottom end of the reactor body.

[0009] In some embodiments, a plurality of thermocouples are included, and the plurality of thermocouples are respectively disposed on the outer side wall of the reactor body.

[0010] In some embodiments, the water storage tank extends to the cooling water tank via an overflow pipe, and an overflow valve is provided at the overflow pipe.

[0011] The beneficial effects of this application are as follows: This application achieves multiple cooling effects on the reactor through the cooperation of multiple components such as the first heat exchange coil, the second heat exchange coil, the first water supply pipe, and the second water supply pipe, ensuring rapid cooling inside the reactor. This application also features a cooling water tank with a refrigeration device that can be installed there to continuously cool the water in the tank. This process occurs during the reaction stage of the reactor (which does not require cooling), allowing the cooling water tank to continuously store low-temperature cooling water during the reaction stage. Subsequently, the water from the cooling water tank is pumped into the first heat exchange coil via the second water pump and the second water supply pipe for heat exchange. Because the water in the cooling water tank is low-temperature water, it can quickly exchange heat with the outer wall of the reactor. This application offers multiple heat exchange methods with different efficiencies, and these methods can be easily switched and adjusted using only valves.

[0012] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0013] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0014] Figure 1 This is a schematic diagram of the overall structure of the device provided in the embodiments of this application;

[0015] Figure 2 This is a partial structural diagram of the reactor body provided in an embodiment of this application;

[0016] Figure 3 This is a schematic diagram of a partial cross-sectional structure of the reactor body provided in an embodiment of this application.

[0017] The reference numerals in the detailed embodiments are as follows:

[0018] The melamine resin production rapid cooling reactor 100, reactor body 110, cooling jacket 111, heat exchange chamber 112, first heat exchange coil 113, first water inlet connector 113a, second heat exchange coil 114, second water inlet connector 114a, first water outlet pipe 115, second water outlet pipe 116, tee pipe 117, heat dissipation fin ring 118, water storage tank 120, cooling water tank 130, first water supply pipe 140, first solenoid valve 141, first water pump 142, second water supply pipe 150, second solenoid valve 151, second water pump 152, third water supply pipe 160, third water pump 161, third solenoid valve 162, multi-way connector 170, fourth water supply pipe 180, fourth water pump 181, fourth solenoid valve 182. Detailed Implementation

[0019] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0020] For details, please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of the device provided in an embodiment of this application. Figure 2 This is a partial structural diagram of the reactor body provided in an embodiment of this application. Figure 3This is a partial cross-sectional structural diagram of the reactor body provided in an embodiment of this application. The rapid cooling reactor 100 for melamine resin production includes a reactor body 110, a water storage tank 120, and a cooling water tank 130. The reactor body 110 is used for the chemical reaction of raw materials. The water storage tank 120 has a large volume, and its internal water is cooled naturally. A chiller can be connected to the cooling water tank 130 to cool its internal water. To maintain the low temperature of the water in the cooling water tank 130 for a longer period, a heat insulation jacket can be installed around the outer periphery of the cooling water tank 130. A cooling jacket 111 is provided around the outer periphery of the reactor body 110. The inner wall of the cooling jacket 111 and the outer wall of the reactor body 110 together form a heat exchange cavity 112. The cooling jacket 111 is used to achieve heat exchange and cooling of the reactor body 110. The heat exchange chamber 112 is equipped with a first heat exchange coil 113 and a second heat exchange coil 114 arranged in a spiral shape. The first heat exchange coil 113 and the second heat exchange coil 114 are used to introduce liquid water to achieve heat exchange and cooling of the interior of the reactor body 110. The first end of the first heat exchange coil 113 extends to the outer periphery of the cooling jacket 111 and is connected to a first water inlet connector 113a, which supplies water to the first heat exchange coil 113. The first end of the second heat exchange coil 114 extends to the outer periphery of the cooling jacket 111 and is connected to a second water inlet connector 114a, which supplies water to the second heat exchange coil 114. The ends of the first heat exchange coil 113 and the second heat exchange coil 114 extend to the outer end of the cooling jacket 111 and are respectively connected to the first water outlet pipe 115 and the second water outlet pipe 116. The ends of the first water outlet pipe 115 and the second water outlet pipe 116 can extend into the water storage tank 120 for collecting cooling water. One end of the first water inlet connector 113a is connected to a three-way pipe 117, which is also connected to a first water supply pipe 140 and a second water supply pipe 150. The first water supply pipe 140 and the second water supply pipe 150 are respectively equipped with a first solenoid valve 141 and a second solenoid valve 151. The end of the first water supply pipe 140 extends into the water storage tank 120 and is equipped with a first water pump 142. The first water pump 142 can pump the water inside the water storage tank 120 into the first heat exchange coil 113 for heat exchange. The end of the second water supply pipe 150 extends to the cooling water pool 130 and is connected to the second water pump 152. The second water pump 152 can pump the water in the cooling water pool 130 to the first heat exchange coil 113 for heat exchange. The second water inlet connector 114a is connected to the third water supply pipe 160, which extends to the water storage pool 120 and is connected to the third water pump 161. The third water supply pipe 160 can pump the water in the water storage pool 120 to the second water inlet connector 114a for heat exchange.

[0021] It should be noted that in the embodiments of this application, the heating method inside the reaction vessel during the reaction process can be electric heating (providing heat through an electric heating belt wrapped around the outer wall of the reaction vessel or a built-in electric heating rod) or steam injection heating (steam is directly introduced into the reaction liquid, and attention should be paid to the dilution of condensate, which may affect the raw material ratio).

[0022] In this embodiment, during the working phase, the refrigeration equipment connected to the cooling water tank 130 continuously cools the water source within the cooling water tank 130. When it is necessary to control the cooling of the reaction vessel, the corresponding heating device is turned off, and alkali (such as NaOH) is added to neutralize the acidic environment to terminate the reaction. Subsequently, the cooling equipment is turned on, and the cooling settings have multiple opening modes corresponding to multiple cooling rates. For example, in the first mode, after closing the second solenoid valve 151, the first water pump 142 and the third water pump 161 are turned on. The first water pump 142 pumps water from the storage tank 120 to the first heat exchange coil 113 for heat exchange and cooling, and the third water pump 161 pumps water from the storage tank 120 to the second heat exchange coil 114 for heat exchange and cooling. In the second mode, the first solenoid valve 141 is closed and the second solenoid valve 151 is turned on. At this time, the cooling water in the cooling water tank 130 is pumped to the first heat exchange coil 113 by the second water pump 152 for rapid cooling.

[0023] As can be seen from the above, in this embodiment, multiple components such as the first heat exchange coil 113, the second heat exchange coil 114, the first water supply pipe 140, and the second water supply pipe 150 work together to achieve multiple cooling effects on the reactor, ensuring rapid cooling inside the reactor. In this application, a cooling water tank 130 is provided, and a refrigeration device can be installed at the cooling water tank 130 to achieve continuous cooling of the water inside. This process occurs during the reaction stage of the reactor (which does not require cooling), allowing the cooling water tank 130 to continuously store low-temperature cooling water during the reaction stage. Subsequently, in this application, the water in the cooling water tank 130 is pumped into the first heat exchange coil 113 via the second water pump 152 and the second water supply pipe 150 for heat exchange. Since the water in the cooling water tank 130 is low-temperature water, it can quickly exchange heat with the outer wall of the reactor. This application has multiple heat exchange methods with different efficiencies, and the various heat exchange methods can be easily switched and adjusted using only valves.

[0024] In some embodiments, the end of the second water inlet connector 114a away from the cooling jacket 111 is connected to a multi-port connector 170, the third water supply pipe 160 is connected to the inner cavity of the multi-port connector 170, the multi-port connector 170 is also connected to a fourth water supply pipe 180, the end of the fourth water supply pipe 180 extends to the cooling water pool 130 and is connected to a fourth water pump 181, and a third solenoid valve 162 and a fourth solenoid valve 182 are respectively provided on the third water supply pipe 160 and the fourth water supply pipe 180.

[0025] As can be seen from the above, in this embodiment of the application, by setting the above, a fourth water pump 181 and a multi-port connector 170 are set at the second heat exchange coil 114. Then, by controlling the third solenoid valve 162 to close and the fourth solenoid valve 182 to open, the water source inside the cooling water pool 130 is pumped to the second heat exchange coil 114 to complete the cooling of the reactor. This form of cooling efficiency is the highest in this application.

[0026] In some embodiments, the outer periphery of the reactor body 110 is provided with a spiral heat dissipation fin ring 118 that matches the first heat exchange coil 113 and the second heat exchange coil 114. In this embodiment, the heat dissipation fin ring 118 is provided to increase the heat dissipation area and heat dissipation effect of the reactor body 110.

[0027] In some embodiments, the cross-sectional area of ​​the first heat exchange coil 113 is smaller than the cross-sectional area of ​​the second heat exchange coil 114. In this embodiment, by setting the cross-sectional area of ​​the first heat exchange coil 113 to be smaller than the cross-sectional area of ​​the second heat exchange coil 114, the first heat exchange coil 113 and the second heat exchange coil 114 have different cooling efficiencies when both are cooled by water flowing into the water storage tank 120 or the cooling water tank 130, thereby enabling this application to have more adjustable cooling efficiencies and forms during use.

[0028] In some embodiments, an extraction pump is included, with its suction end connected to the bottom end of the reactor body 110. In this embodiment, the finished product in the reactor is extracted using the extraction pump. Using an extraction pump to extract the finished product is a conventional practice in the art and will not be elaborated further here.

[0029] In some embodiments, a plurality of thermocouples are included, and the thermocouples are respectively disposed on the outer side wall of the reactor body 110. In this embodiment, the use of thermocouples facilitates real-time monitoring of the temperature of the reactor body 110.

[0030] In some embodiments, the water storage tank 120 extends to the cooling water tank 130 via an overflow pipe, and an overflow valve is provided at the overflow pipe. In this embodiment, the water inside the water storage tank 120 can be diverted to the cooling water tank 130 through the overflow pipe for cooling and water replenishment.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although the foregoing embodiments have provided a detailed description of this application, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rapid cooling reactor for melamine resin production, characterized in that, The reactor includes a reaction vessel body, a water storage tank, and a cooling water tank. A cooling jacket is provided on the outer periphery of the reaction vessel body. The inner wall of the cooling jacket and the outer wall of the reaction vessel body together form a heat exchange cavity. A first heat exchange coil and a second heat exchange coil are spirally arranged in the heat exchange cavity. The first end of the first heat exchange coil extends to the outer periphery of the cooling jacket and is connected to a first water inlet connector. The first end of the second heat exchange coil extends to the outer periphery of the cooling jacket and is connected to a second water inlet connector. The ends of the first heat exchange coil and the second heat exchange coil extend to the outer end of the cooling jacket and are respectively connected to a first water outlet pipe and a second water outlet pipe. One end of the first water inlet connector is connected to a T-pipe, which is also connected to a first water supply pipe and a second water supply pipe. A first solenoid valve and a second solenoid valve are respectively installed on the first water supply pipe and the second water supply pipe. The end of the first water supply pipe extends into the water storage tank and is equipped with a first water pump. The end of the second water supply pipe extends into the cooling water tank and is connected to a second water pump. The second water inlet connector is connected to a third water supply pipe, which extends into the water storage tank and is connected to a third water pump.

2. The rapid cooling reactor for melamine resin production according to claim 1, characterized in that, The second water inlet connector is connected to a multi-port connector at the end away from the cooling jacket. The third water supply pipe is connected to the inner cavity of the multi-port connector. The multi-port connector is also connected to a fourth water supply pipe. The end of the fourth water supply pipe extends to the cooling water pool and is connected to a fourth water pump. A third solenoid valve and a fourth solenoid valve are respectively installed on the third water supply pipe and the fourth water supply pipe.

3. The rapid cooling reactor for melamine resin production according to claim 1, characterized in that, The outer periphery of the reactor body is provided with a spiral heat dissipation fin ring that matches the first heat exchange coil and the second heat exchange coil.

4. The rapid cooling reactor for melamine resin production according to claim 1, characterized in that, The cross-sectional area of ​​the first heat exchange coil is smaller than that of the second heat exchange coil.

5. The rapid cooling reactor for melamine resin production according to claim 1, characterized in that, It includes an extraction pump, the suction end of which is connected to the bottom end of the reactor body.

6. The rapid cooling reactor for melamine resin production according to claim 1, characterized in that, It includes multiple thermocouples, which are respectively disposed on the outer side wall of the reactor body.

7. The rapid cooling reactor for melamine resin production according to claim 1, characterized in that, The water storage tank extends to the cooling water tank via an overflow pipe, and an overflow valve is installed at the overflow pipe.

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