CN210700128U

CN210700128U - Multi-thread coil reactor

Info

Publication number: CN210700128U
Application number: CN201920793588.9U
Authority: CN
Inventors: 董振宇; 何潮洪; 戴立言; 刘仲谦; 朱海; 崔兴; 于飞; 吴可君
Original assignee: Quzhou Research Institute of Zhejiang University
Current assignee: Quzhou Research Institute of Zhejiang University
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-06-09
Anticipated expiration: 2029-05-29

Abstract

The utility model discloses a multi-thread coil reactor, in particular to a liquid phase strong exothermic reaction accompanied with gas by-products. The reactor mainly comprises a multi-spiral-wave coil reactor, a heat exchange stirring kettle and a spherical mixer; reactants are premixed in a spherical mixer, enter a coil reactor in a natural flow mode from top to bottom and react; by adjusting the cold fluid flow of the stirring kettle jacket and the rotating speed of the stirring paddle, the reaction heat is quickly removed, and the temperature gradient in the kettle is reduced. The utility model provides a coil pipe reactor adopts the wall structure of multithread, can change the flow pattern of intraductal outer fluid, reinforce heat and mass transfer, improve the security of reaction process, especially when the velocity of flow is lower, can alleviate the torrent degree low, mix insufficient and heat and mass transfer effect subalternation problem.

Description

Multi-thread coil reactor

Technical Field

The utility model relates to a multi-thread coil reactor for strong exothermic reaction, in particular to a multi-thread coil reactor for strong exothermic reaction accompanied with gas by-products and liquid phase.

Background

The strongly exothermic reaction is often accompanied by a large number of side reactions, not only the mechanism is complex, but also the reaction releases larger heat and is easy to run away from control. The reaction system often contains a large amount of unstable compounds, is flammable and explosive, and generates a large amount of bubbles after decomposition, and therefore, it is necessary to improve the heat transfer efficiency, control the concentration of the reactant, and prevent the reaction from being excessively violent. The tubular reactor is one of the core devices in industrial production, and has a series of advantages of simple structure, large specific surface area, high controllability, low online quantity, small back mixing and the like. The tubular reactor can effectively control the flow velocity in the tube and avoid the reaction from being too violent. When the flow velocity in the tube is too low, the effects of heat transfer, mass transfer and mixing are affected.

At present, how to safely and effectively carry out the strong exothermic reaction becomes a problem which is difficult and urgently needed to be solved. The utility model discloses combine the characteristics of strong exothermic reaction, comprehensive consideration factors such as safety, production efficiency, operation have developed a multi-thread coil pipe reactor for strong exothermic reaction: so as to realize the strengthening of the processes of heat and mass transfer, mixing and the like, improve the reaction process and reduce the potential safety hazard.

Disclosure of Invention

The utility model aims to solve the problem of providing a multi-thread coil reactor for strong exothermic reaction. The invention has wide application range and simple operation, and can realize the following functions: at relatively low flow rates, turbulence of the fluid may be enhanced; when the strong heat reaction is carried out, heat can be effectively exchanged, and the safety of the reaction process is improved; a natural flow mode from top to bottom is adopted, so that a gas byproduct flowing space is provided, slug flow is prevented, and liquid phase flow is enhanced; the reactor adopts the connection of multistage, increases exhaust and emergency discharge valve between the section, reducible systemic risk.

In order to solve the problems, the utility model provides a multi-thread coil reactor, which comprises a multi-thread coil reactor, a spherical mixer and a heat exchange stirred tank; the multi-thread coil reactor is arranged in the heat exchange stirring kettle and provides a place for reaction; the heat exchange stirring kettle provides a heat exchange place; at least one side surface of the spherical mixer is a spherical crown surface, an inlet pipe orifice of the spherical mixer is opposite to the concave side of the spherical crown surface, and an outlet pipe orifice of the spherical mixer is connected with the multi-thread coil reactor; the number of the heads of the multi-thread coil reactor is 2-10, the outer diameter is 10-100mm, the groove depth is 2-20mm, and the lead is 1-10 times of the outer diameter; the heat exchange stirring kettle is provided with a jacket for flowing cold fluid.

Preferably, the multi-thread coil reactor adopts a coil external structure, the coil diameter is 100-2000mm, and the thread pitch is 1-5 times of the external diameter.

Preferably, the multi-thread coil reactor adopts segmented connection, the segmented connection can reduce the online amount of materials in the reactor, and each multi-thread coil reactor is arranged in the heat exchange stirring kettle. The liquid amount in the kettle is not changed and the temperature distribution is more uniform by adopting the cooperative regulation of the flow of the jacket and the rotating speed of the stirring paddle.

Preferably, the multi-section connected multi-thread coil reactors are connected by pipelines, and emergency operation devices such as an exhaust valve and an emergency discharge valve are arranged on the pipelines between the sections.

Preferably, the outer wall surface (105) of the multi-thread coil reactor is embossed and roughened. After the embossing treatment, the heat exchange area can be increased by about 30 percent, and the heat exchange effect is enhanced.

The multi-thread coil reactor can be applied to strong exothermic reactions: two or more reaction materials are injected into the mixer to impact the spherical crown surface and realize quick premixing; after premixing, the reactants naturally flow from top to bottom into the multi-thread coil reactor and react; a large amount of heat exchange carriers (such as brine or oil) are arranged in the heat exchange stirring kettle, so that the heat released by the reaction can be quickly removed.

Preferably, the cold fluid in the jacket enters the jacket from an inlet (204) positioned below the jacket and leaves the jacket from an outlet (205) positioned above the jacket, and the heat exchange carrier in the heat exchange stirred tank exchanges heat with the cold fluid in the jacket.

Preferably, when the temperature in the heat exchange stirring kettle fluctuates, the flow of the cold fluid in the jacket and the rotating speed of the stirring paddle in the heat exchange stirring kettle are changed to adjust.

Preferably, the strongly exothermic reaction is a strongly exothermic reaction mainly involving a liquid phase reaction with a gas byproduct, such as nitration, nitrolysis, diazotization, and the like. In a multi-head helical tube reactor, the generated gas is quickly disturbed along with the main fluid, and the liquid turbulence is greatly strengthened.

Compared with the prior art, the utility model following beneficial effect and advantage have: 1. the multi-thread spiral corrugated coil is used as a reactor, so that the heat transfer, mass transfer and transmission can be enhanced, and the multi-thread coil reactors are connected in multiple stages, so that the online amount of materials in the reactor is reduced; 2. a natural flow mode from top to bottom is adopted to provide a gas flow space, so that slug flow is prevented from forming, and the reaction process is safer; 3. the spherical mixer adopts a spherical reflection structure, and realizes the rapid mixing of a plurality of strands of fluid by impacting a spherical crown surface with the fluid; 4. the reaction system in the coil pipe and the cold fluid in the jacket indirectly exchange heat through the heat exchange carrier in the kettle, when the temperature fluctuation is small, the rotating speed of the stirring paddle can be adjusted, and when the temperature fluctuation is large, the flow of the cold fluid and the rotating speed of the stirring paddle can be adjusted simultaneously, so that the controllability of the reaction temperature is higher, and the temperature distribution in the kettle is more uniform.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. Obviously, the following figures are only some embodiments of the invention, and other figures can be derived by those skilled in the art without inventive effort, wherein:

FIG. 1 is a schematic flow diagram of a multi-thread coil reactor for strongly exothermic reactions according to the present invention;

fig. 2 is the core reactor provided by the utility model: structure diagram of multi-thread coil reactor;

fig. 3 is a cross-sectional view of a multi-thread coil reactor provided by the present invention;

fig. 4 is a schematic view of the wall surface of the roughened multi-thread coil reactor provided by the present invention;

FIG. 5 is a schematic structural view of the heat exchange stirred tank and multi-thread coil reactor provided by the present invention;

fig. 6 is a front view and a left side view of the spherical mixer provided by the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention. The described embodiments are only some, not all embodiments of the invention.

The following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the reference numerals of the devices involved in the embodiments are the same as those in the drawings.

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

First embodiment

Example 1 referring to fig. 1, a multi-thread coil reactor for strongly exothermic reactions mainly comprises a multi-thread coil reactor 1, a heat exchange stirred tank 2, a spherical mixer 3 and valves; the multi-thread coil reactor 1 can provide a place for reaction; the heat exchange stirring kettle 2 provides a place for fluid heat exchange, and the heat exchange effect can be enhanced through the stirring paddle; the spherical mixer 3 adopts a spherical reflection structure to realize the quick premixing of two or more streams of fluid; the valve can realize the functions of exhausting, emergency discharging and the like.

As shown in fig. 2, the core of a multiple-screw coil reactor for strongly exothermic reactions is a multiple-screw coil reactor 1. According to different reaction characteristics, different structural parameters can be selected: 2-10 threads, 10-100mm of outer diameter, 2-20mm of groove depth and 1-10 times of lead. The coil pipe reactor can adopt the form of a coil pipe, and comprises spiral type, long-size type, variable-diameter type and other coil curves: the coil bending diameter is 100-2000mm, and the thread pitch is 1-5 times of the pipe diameter. Through the outer structure of the spiral, the fluid can generate centrifugal motion, secondary flow is initiated, transmission, heat transfer and mass transfer are enhanced, and the reaction is further improved.

FIG. 3 provides two general cross-sectional views of a multi-helical bellows, including a cross-section 101 of a four-threaded coil reactor and a cross-section 102 of a six-threaded coil reactor.

Fig. 4 provides a roughened tube wall surface 105 for increasing the specific surface area without increasing the flow resistance outside the tube.

As shown in the attached figure 5, the multi-thread coil reactor is arranged in a heat exchange stirring kettle 2: the reaction fluid enters from the inlet pipe 201 of the reactor and exits from the outlet pipe 202 in a top-down flow mode; the stirring paddle 203 can adopt various forms such as a propelling paddle, a four-inclined blade paddle and the like, and the rotating speed is adjusted to ensure that the temperature distribution in the kettle is more uniform; cold fluid enters the jacket from an inlet 204 positioned below the jacket and leaves the jacket from an outlet 205 positioned above the jacket, and heat exchange carriers in the heat exchange stirred tank exchange heat with the cold fluid in the jacket. An outlet 206 at the lower end of the heat exchange stirred tank can discharge the heat exchange carriers in the stirred tank.

As shown in fig. 6, the spherical mixer comprises reaction

liquid inlets

301 and 302, a reaction liquid outlet 303 and a spherical cap surface 304, two reaction fluids respectively enter the spherical mixer from the pipe orifice 301 and the pipe orifice 302, strike the spherical cap surface 304 to realize the premixing of the reaction fluids, and then enter the multi-thread coil reactor from the reaction liquid outlet 303.

Second embodiment

Nitration of energetic compounds using a multi-threaded coil reactor: the reaction is a strong exothermic reaction, and a stirring kettle is adopted for heat exchange; when the reactor adopts a four-thread coil, the outer diameter is 16mm, the inner diameter is 9mm, the lead is 35mm, and the length of the coil is 5 m; the coil has the coil diameter of 400mm, the thread pitch of 20mm and the number of turns of 5 turns; the feeding temperature of the reaction liquid is-10 ℃, and the temperature of the heat exchange carrier in the stirring kettle is-16 ℃. Under the operating conditions, the reaction time was controlled at 15 min. The conversion rate of reactants can reach more than 90 percent, and the yield of products is about 60 percent. Compared with a 12mm circular tube reactor with the same sectional area, the yield is improved by 5 percent.

While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended to cover in the appended claims all such changes and modifications that are within the scope of the invention.

It is to be understood that the embodiments described herein are merely exemplary and that variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. All such variations and modifications are intended to be included within the scope of the present invention as described hereinabove. Moreover, all embodiments disclosed need not be in the form of selected embodiments, as the embodiments of the invention can be combined to achieve desired results.

Claims

1. A multi-thread coil reactor is characterized by comprising a multi-thread coil reactor, a heat exchange stirring kettle, a spherical mixer and the like; the multi-thread coil reactor is arranged in the heat exchange stirring kettle and provides a reaction place; the heat exchange stirring kettle is provided with a jacket and a stirring paddle and provides a heat exchange place; at least one side surface of the spherical mixer is a spherical crown surface, an inlet pipe orifice of the spherical mixer is opposite to the concave side of the spherical crown surface, and an outlet pipe orifice of the spherical mixer is connected with the multi-thread coil reactor; the number of threads of the multi-thread coil reactor is 2-10, the outer diameter of a section circumcircle is 10-100mm, the groove depth is 2-20mm, and the lead is 1-10 times of the outer diameter.

2. The multi-threaded coil reactor as claimed in claim 1, wherein the multi-threaded coil reactor adopts a serpentine outer structure, the serpentine diameter is 100-2000mm, and the thread pitch is 1-5 times the outer diameter.

3. The multi-threaded coil reactor of claim 1, wherein the multi-threaded coil reactor is connected in multiple stages, each stage is arranged in a heat exchange stirred tank, and a vent valve and an emergency discharge valve are arranged between the stages.

4. The multiple-threaded coil reactor of claim 1, wherein the outer wall surface (105) of the multiple-threaded coil reactor is embossed with a roughening treatment.