Energy-saving reflux reaction system

Abstract

The utility model discloses an energy-saving reflux reaction system which comprises a reaction kettle and a reaction raw material storage source, the reaction raw material storage source is communicated with the reaction kettle, a gas phase outlet pipeline of the reaction kettle is provided with a reflux energy saver, a gas channel is arranged in the reflux energy saver, the gas phase outlet pipeline of the reaction kettle is communicated with the gas channel, and the reflux energy saver is communicated with the gas channel. A cold raw material circulation cavity is arranged outside the gas channel in a sleeving manner, a raw material inlet and a raw material outlet are formed in the cold raw material circulation cavity, the raw material inlet is communicated with a reaction raw material storage source, and an outlet of the gas channel is connected with a backflow gas inlet in the reaction kettle. According to the energy-saving reflux reaction system provided by the utility model, reaction raw materials can be preheated in advance, and the load of the original gas phase condenser is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical reaction production technical field, concretely relates to a kind of energy-saving reflux reaction system. BACKGROUND

[0002] In long reflux reaction production, the gas phase in the reaction kettle is condensed by condenser and refluxed into the reaction kettle. The cooling medium is a single refrigerant, such as circulating water or other refrigerants. The heat at this point is not recycled. In large-scale, long reflux reaction, the heat generated is considerable. If this heat is not recycled, it will cause a great waste of heat.

[0003] In view of this, the present patent application is proposed. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an energy-saving reflux reaction system to solve the problem of large-scale waste of heat in the reflux reaction process of the current chemical production reaction system.

[0005] The utility model is implemented by the following technical solutions:

[0006] An energy-saving reflux reaction system includes a reaction kettle and a reaction raw material storage source. The reaction raw material storage source is in communication with the reaction kettle. A reflux energy saver is arranged on the gas phase outlet pipeline of the reaction kettle. A gas passage is arranged in the reflux energy saver. The gas phase outlet pipeline of the reaction kettle is in communication with the gas passage. A cold raw material flow cavity is arranged outside the gas passage. A raw material inlet and a raw material outlet are arranged on the cold raw material flow cavity. The raw material inlet is in communication with the reaction raw material storage source. The inlet of the gas passage is connected with the reflux gas inlet on the reaction kettle.

[0007] As a preferred design, the raw material inlet on the cold raw material flow cavity is arranged at the bottom near the reflux energy saver. The raw material outlet is arranged at the top near the reflux energy saver. The raw material inlet and the raw material outlet are respectively arranged on the two sides of the reflux energy saver.

[0008] As a preferred design, a condenser is arranged between the outlet of the gas passage and the reflux gas inlet on the reaction kettle.

[0009] As a preferred design, a reaction kettle feeding valve is arranged between the reaction raw material storage source and the reaction kettle. A raw material feeding valve A1, a raw material blocking valve, and a reflux energy saver inlet valve are sequentially arranged on the connecting pipeline between the reaction raw material storage source and the reflux energy saver.

[0010] As a preferred design, a condensate discharge valve A and a reflux gas recovery valve A are arranged on the connecting pipeline between the condenser and the reflux gas inlet on the reaction kettle.

[0011] As a preferred design, the reaction kettle is provided with multiple, the reflux economizer is provided with multiple, each reaction kettle is provided with a reflux economizer and a condenser, the raw material outlet of a reflux economizer is connected with the inlet of the adjacent reaction kettle, and the raw material outlet of a reflux economizer is connected with the raw material inlet of the adjacent reflux economizer.

[0012] As a preferred design, the connection pipeline between the raw material outlet of a reflux economizer and the inlet of the adjacent reaction kettle is sequentially provided with a control valve A, a control valve B, a material blocking valve A and a control valve C.

[0013] As a preferred design, the connection pipeline between the raw material outlet of a reflux economizer and the raw material inlet of the adjacent reflux economizer is provided with a control valve D.

[0014] As a preferred design, each reflux economizer is provided with two raw material inlets and a raw material outlet.

[0015] As a preferred design, the energy-saving reflux reaction system further comprises multiple temperature monitoring meters arranged on corresponding material flow pipelines.

[0016] The energy-saving reflux reaction system has the following advantages and beneficial effects compared with the prior art:

[0017] The energy-saving reflux reaction system provided by the utility model sets a reflux economizer on the gas phase outlet pipeline of the reaction kettle, and the cooling medium is the reaction liquid raw material, so that the reaction raw material that needs to be heated is preheated in advance, the load of the original gas phase condenser is reduced, the preheating of the reaction raw material is achieved, the loss of heat is minimized, the heat is maximally utilized, the system is quite practical in large-scale reflux reaction production, the equipment structure is simple, the investment is small, the operation is easy, and the system is worth popularizing and using. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the example embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.In the drawings:

[0019] Figure 1 The utility model provides a kind of structure schematic diagram of energy-saving reflux reaction system.

[0020] Figure 2 The utility model provides a kind of structure schematic diagram of energy-saving reflux reaction system.

[0021] Figure: 1 - raw material isolation valve, 2 - material isolation valve A, 3 - material isolation valve B, 4 - reflux gas recovery valve A, 5 - condensate discharge valve A, 6 - kettle bottom valve A, 7 - reflux gas recovery valve B, 8 - condensate discharge valve B, 9 - kettle bottom valve B, 10 - heat exchanger discharge valve A, 11 - reactor feed valve, 12 - inlet and outlet valve B, 13 - reflux economizer inlet valve, 14 - inlet and outlet valve A, 15 - vent valve A, 16 - control valve A, 17 - control valve B, 18 - inlet and outlet valve C, 19 - feed valve A, 20 - heat exchanger discharge valve B, 21 - control valve C, 22 - control valve I, 23 - control valve D, 24 - control valve H, 25 - vent valve B, 26 - control valve E, 27 - control valve F, 28 - control valve G, 29 - feed valve B, 30 - cold raw material flow cavity, 31 - gas passage. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application clearer, further detailed description will be given below in combination with embodiments and drawings. The schematic embodiments and their descriptions are only used to explain the present application, and not to limit the present application.

[0023] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without these specific details. In other instances, well-known structures, circuits, materials or processes have not been described in detail in order to avoid obscuring the present application.

[0024] In the entire description, the mention of "one embodiment", "an embodiment", "one example" or "an example" means that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present application. Therefore, the phrases "one embodiment", "an embodiment", "one example" or "an example" appearing in various places throughout the description do not necessarily refer to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in one or more embodiments or examples in any appropriate combination and / or subcombination. In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0025] In the description of the utility model, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the protection scope of the utility model.

[0026] Embodiment 1:

[0027] As shown in Figure 1 , 2 An energy-saving reflux reaction system, comprising a reaction kettle and a reaction raw material storage source, the reaction raw material storage source being in communication with the reaction kettle to introduce reaction raw materials, a reflux energy-saving device being provided on a gas phase outlet pipeline of the reaction kettle, a gas passage 31 being provided inside the reflux energy-saving device, the gas phase outlet pipeline of the reaction kettle being in communication with the gas passage 31, a cold raw material flow passage 30 being provided outside the gas passage 31, a raw material inlet and a raw material outlet being provided on the cold raw material flow passage 30, the raw material inlet being in communication with the reaction raw material storage source, and an outlet of the gas passage 31 being in communication with a reflux gas inlet on the reaction kettle.

[0028] In use, cold raw materials at a lower temperature are introduced into the flow passage, and the gas in the gas passage inside the flow passage is cooled under the external cold source, the cold raw materials are heated by absorbing the heat of the high-temperature gas, thereby preheating the cold raw materials and utilizing the heat in the reflux reaction. The raw material liquid after waste heat is discharged through the raw material outlet and introduced into the next process, such as reaction. The cooled gas condensate is directly returned to the reaction kettle, and a small part of the gas that is not cooled is condensed by the secondary condenser and then returned to the reaction kettle.

[0029] Further, the raw material inlet on the cold raw material flow passage is arranged at the bottom of the reflux energy-saving device, the raw material outlet is arranged at the top of the reflux energy-saving device, and the raw material inlet and the raw material outlet are respectively arranged on the two sides of the reflux energy-saving device.

[0030] Better, a condenser such as condenser H3 and condenser H4 is arranged between the outlet of the gas passage and the reflux gas inlet on the reaction kettle. The condenser can use cooling water or other cooling medium, which is to further condense the gas that is not condensed from the gas passage.

[0031] In order to facilitate the control of the reaction process, a reactor feed valve 11 is arranged between the reaction raw material storage source and the reactor, and the raw material liquid is fed into the reactor through the reactor feed valve 11. A raw material feed valve A1, a raw material isolation valve 1 and a reflux economizer inlet valve 13 are arranged in sequence on the connecting pipeline between the reaction raw material storage source and the reflux economizer.

[0032] A condensate discharge valve A5 and a reflux gas recovery valve A4 are arranged on the connecting pipeline between the condenser and the reflux gas inlet of the reactor. Alternatively, a condensate discharge valve B8 and a reflux gas recovery valve B7 are arranged. The excess condensate can be discharged through the condensate discharge valve A5 and the condensate discharge valve B8.

[0033] In order to further utilize the heat, in the embodiment, multiple reactors and multiple reflux economizers are arranged, one reflux economizer and one condenser are arranged corresponding to each reactor, the raw material outlet of one reflux economizer is connected to the inlet of the adjacent reactor, and the raw material outlet of one reflux economizer is connected to the raw material inlet of the adjacent another reflux economizer. Through such arrangement, multiple reactors can be connected in series, the cold raw material liquid can be preheated by one reflux economizer (which can be defined as the first reflux economizer) and then enter the adjacent reactor (which can be defined as the second reactor) for reaction, or continue to be preheated by the adjacent reflux economizer (which can be defined as the second reflux economizer) and then enter the next reactor (which can be defined as the third reactor). The process is repeated, and a considerable amount of heat can be recovered in a large-scale reflux reaction.

[0034] In order to better control the reaction, corresponding control valves are needed at the nodes. For example, control valve A16, control valve B17, material isolation valve 2 and control valve C21 are arranged in sequence on the connecting pipeline between the raw material outlet of one reflux economizer (which can be defined as the first reflux economizer) and the inlet of the adjacent reactor (which can be defined as the second reactor). The preheated raw material liquid enters the second reactor for reaction through the opening of the control valve A16, the control valve B17, the material isolation valve 2 and the control valve C21.

[0035] Control valve D23 is arranged on the connecting pipeline between the raw material outlet of one reflux economizer and the raw material inlet of the adjacent reflux economizer. The preheated raw material liquid enters the second reflux economizer for preheating and then enters the next reaction process through the opening of the control valve A16, the control valve B17, the material isolation valve 2 and the control valve D23.

[0036] Better, two raw material inlets and raw material outlets are arranged on each reflux economizer, to form two raw material liquid preheating flow channels, each raw material inlet and the corresponding raw material outlet are oppositely arranged, and the raw material liquid can enter from both sides of each reflux economizer for preheating.

[0037] The embodiment also comprises a plurality of temperature monitors arranged on corresponding material flow pipelines, and the preheating effect is monitored by the temperature monitors.

[0038] In the embodiment, the bottom of each reaction kettle is provided with a valve, which is a kettle bottom valve A6 and a kettle bottom valve B 9 respectively, each reflux economizer is provided with a vent valve, which is a vent valve A15 and a vent valve B 25 respectively, each reflux economizer is provided with a heat exchanger liquid discharge valve, which is a heat exchanger liquid discharge valve A10 and a heat exchanger liquid discharge valve B 20 respectively, each reflux economizer is also provided with an economizer inlet and outlet valve, which is an inlet and outlet valve A14, an inlet and outlet valve B12 and an inlet and outlet valve C18 respectively, and each reflux economizer and the reaction kettle are provided with a feeding valve, which is a feeding valve A19 and a feeding valve B 29 respectively.

[0039] The energy-saving reflux reaction system can be installed in series with a number of mutual reflux economizers according to the scale in normal production, for example, two units are taken as an example, and the same principle applies to a plurality of units.

[0040] The working principle of the energy-saving reflux reaction system is as follows:

[0041] In the initial reaction, liquid reaction raw material A is introduced into the reaction kettle R1 by opening the raw material feeding valve A1, the raw material isolation valve 1 and the reaction kettle feeding valve 11, and other valves are in a closed state.

[0042] With the addition of reaction materials and the rise of temperature in the reaction process, the reaction materials are introduced into the reaction kettle R2 through the reflux economizer: reaction raw material A is introduced into the reflux economizer H1 by opening the raw material feeding valve A1, the raw material isolation valve 1 and the reflux economizer inlet valve 13, and enters the reaction kettle R2 by opening the control valve A16, the control valve B17, the material isolation valve A2 and the control valve C 21, and other valves are in a closed state.

[0043] When the reaction kettles R1, R2 are both in the high-temperature reflux reaction stage, the reaction raw materials are preheated and added to the next reactor R3, R4, R5...Rn through the previous operation method. Specifically, the reaction raw materials A enter the reflux energy saver H1 by opening the raw material feeding valve A1, the raw material isolation valve 1, and the reflux energy saver inlet valve 13, enter the reflux energy saver H2 by opening the control valve A16, the control valve B17, the material isolation valve A2, and the control valve D 23, enter the reactor R3, R4, R5...Rn by opening the control valve E 26, the control valve F 27, the material isolation valve B 3, the raw material feeding valve A2, and other valves being in the closed state.

[0044] II. When the reactor R1 reaction is completed, the material route for the next batch of reactions is as follows:

[0045] 1. The reaction raw materials A enter the reactor R1 by opening the raw material feeding valve A2, the material isolation valve B 3, the control valve G 28, entering the reflux energy saver H2, opening the control valve H 24, the control valve I 22, the material isolation valve A 2, the feeding valve A19, and other valves being in the closed state.

[0046] 2. The feeding operation principle is the same when the next batch of reactions is performed after the completion of the reaction of the other reactors.

[0047] 3. The preheating effect of the raw materials can be observed through the thermometers T1, T2, T3, T4, T5, T6...Tn.

[0048] The above specific embodiments further illustrate the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An energy-saving backflow reaction system, comprising a reaction kettle and a reaction raw material storage source, wherein the reaction raw material storage source is in communication with the reaction kettle, characterized in that, The gas phase outlet pipeline of the reaction kettle is provided with a reflux economizer, the inside of the reflux economizer is provided with a gas passage (31), the gas phase outlet pipeline of the reaction kettle communicates with the gas passage (31), the outside of the gas passage (31) is provided with a cold raw material flow cavity (30), the cold raw material flow cavity (30) is provided with a raw material inlet and a raw material outlet, the raw material inlet communicates with a reaction raw material storage source, and the inlet of the gas passage (31) is connected with a reflux gas inlet on the reaction kettle.

2. The energy-efficient reflow reaction system of claim 1, wherein The raw material inlet on the cold raw material flow cavity (30) is arranged at the bottom close to the reflux economizer, the raw material outlet is arranged at the top close to the reflux economizer, and the raw material inlet and the raw material outlet are respectively located on the two sides of the reflux economizer.

3. The energy-efficient reflow reaction system of claim 1 or 2, wherein, The outlet of the gas passage (31) is provided with a condenser between the reflux gas inlet on the reaction kettle.

4. The energy-efficient reflow reaction system of claim 3, wherein, The reaction raw material storage source and the reaction kettle are provided with a reaction kettle feeding valve (11), the connecting pipeline between the reaction raw material storage source and the reflux economizer is sequentially provided with a raw material feeding valve A1, a raw material blocking valve (1) and a reflux economizer inlet valve (13).

5. The energy-efficient reflow reaction system of claim 4, wherein, The connecting pipeline between the condenser and the reflux gas inlet on the reaction kettle is provided with a condensate discharge valve A (5) and a reflux gas recovery valve A (4).

6. The energy-efficient reflow reaction system of claim 4 or 5, wherein, The reaction kettle is provided with a plurality of reflux economizers, each reaction kettle is provided with one reflux economizer and one condenser, the raw material outlet of one reflux economizer communicates with the inlet of an adjacent reaction kettle, and the raw material outlet of one reflux economizer is connected with the raw material inlet of an adjacent reflux economizer.

7. The energy-efficient reflow reaction system of claim 6, wherein, The connecting pipeline between the raw material outlet of one reflux economizer and the inlet of an adjacent reaction kettle is sequentially provided with a control valve A (16), a control valve B (17), a material blocking valve A (2) and a control valve C (21).

8. The energy-efficient reflow reaction system of claim 6, wherein, The connecting pipeline between the raw material outlet of one reflux economizer and the raw material inlet of an adjacent reflux economizer is provided with a control valve D (23).

9. The energy-efficient reflow reaction system of claim 6, wherein, Each reflux economizer is provided with two raw material inlets and a raw material outlet.

10. The energy-efficient reflow reaction system of claim 6, wherein, A plurality of temperature monitoring meters are arranged on the corresponding material flow pipelines.

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