A system for avoiding the generation of a bang when discharging a reactor

Abstract

The utility model is suitable for chemical production equipment technical field, propose a kind of system to avoid the explosion of reaction kettle discharge, including reaction kettle, steam recovery tank, primary settler, primary settler is also connected with steam passage, and the pressure sensor that real-time monitoring its maintenance micro-positive pressure is equipped on primary settler;Steam passage includes waste steam passage and new steam passage.Summarized above, the waste steam generated by the reaction kettle is introduced into the primary settler through the pipeline, and a new steam passage is added to the original discharge system, so that the primary settler can also be supplied with new steam, keeping the primary settler at a micro-positive pressure, preventing the formation of explosive gas and ignition source in the primary settler, thereby avoiding the occurrence of "explosion" phenomenon in the primary settler, preventing equipment damage, chemical reaction equipment explosion, leakage of toxic and harmful gases, and avoiding personnel casualties and chemical accidents.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to a system for preventing explosions during discharge from a reaction vessel. Background Technology

[0002] The sorbitol workshop uses glucose syrup as raw material and processes it through decolorization, ion exchange, hydrogenation, sedimentation, alcohol decolorization, alcohol ion exchange, evaporation and concentration. The hydrogenation reaction involves adding nickel to a metering tank and stirring to mix the nickel and sugar solution. The nickel-added sugar solution is then reacted in a reactor under high temperature and pressure to convert into alcohol. During this process, the reaction pressure is 5–8 MPa, the reaction temperature is 120–160°C, and the reaction lasts approximately 3 hours. After the reaction is complete, the liquid in the reactor is discharged into a primary sedimentation tank.

[0003] During the process of discharging the liquid from the reactor into the primary settling tank, the gas in the primary settling tank may explode, which is referred to as a "detonation" in production. The specific reasons are analyzed as follows:

[0004] 1. Gas source:

[0005] During the discharge of the liquid from the reactor into the primary settling tank, hydrogen gas is carried into the primary settling tank. During the discharge process of the primary settling tank, the liquid level inside drops, the pressure in the primary settling tank becomes negative, and oxygen from the air enters the primary settling tank.

[0006] 2. Conditions for the "explosive sound":

[0007] During the discharge of the liquid from the reactor to the primary settling tank, the hydrogen carried by the liquid will cause static electricity due to friction in the pipeline; the highly active catalyst in the primary settling tank will spontaneously combust due to the high temperature of the tank wall, producing sparks.

[0008] If hydrogen and oxygen are present in a settling tank at the same time, and the conditions for hydrogen and oxygen to react are met, a critical state will be reached, causing a detonation in the settling tank.

[0009] If the amount of gas exploding in a settling tank is relatively small, the resulting explosion will be mild and may cause minor damage to the equipment. However, if the amount of gas exploding in a settling tank is relatively large, the resulting explosion will be severe and may lead to an explosion of chemical reaction equipment, leakage of toxic and harmful gases, casualties, and serious chemical accidents.

[0010] Therefore, the "explosive" phenomenon urgently needs to be addressed. Utility Model Content

[0011] In view of this, this utility model proposes a system to avoid the explosion caused by the discharge of material from the reactor, so as to solve the problem of the "explosion" phenomenon in the primary settling tank.

[0012] The technical solution of this utility model is implemented as follows:

[0013] This invention provides a system to prevent explosions during the discharge of materials from a reactor. The system includes a reactor, a steam recovery tank, and a primary settling tank. The primary settling tank is also connected to a steam channel, and a pressure sensor is installed on the primary settling tank to monitor and maintain a slight positive pressure in real time.

[0014] Based on the above technical solutions, preferably, the steam channel includes a waste steam channel, with the two ends of the waste steam channel connected to a primary settling tank and a steam recovery tank, respectively.

[0015] Based on the above technical solutions, preferably, a discharge channel is provided between the reactor and the primary settling tank; the steam channel also includes a new steam channel, which is set on the discharge channel.

[0016] Based on the above technical solutions, preferably, the two ends of the new steam channel are connected to a steam storage tank and a discharge channel, respectively.

[0017] Based on the above technical solutions, preferably, a steam valve is provided on the new steam channel.

[0018] Based on the above technical solutions, preferably, both the steam valve and the pressure sensor are connected to the control system.

[0019] The system of this invention for preventing explosions during reactor discharge has the following advantages over existing technologies:

[0020] Waste steam generated in the reactor is introduced into the primary settling tank through a pipeline. A new steam channel is added to the original discharge system so that new steam can still be introduced into the primary settling tank, maintaining a slight positive pressure. This prevents the formation of explosive gases and ignition sources within the primary settling tank, thus avoiding the occurrence of "explosions" in the primary settling tank, preventing equipment damage, explosions of chemical reaction equipment, and leaks of toxic and harmful gases, and preventing personnel casualties and chemical accidents. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 System structure diagram to avoid explosions during reactor discharge;

[0023] In the diagram: 1. Reactor; 2. Steam recovery tank; 3. Primary settling tank; 4. Steam storage tank; 5. New steam passage; 6. Waste steam passage; 7. Steam valve. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0025] The sorbitol production reactor discharge system includes a reactor 1, a steam recovery tank 2, and a primary settling tank 3. The hydrogenation reaction takes place in reactor 1. After the reaction is completed, the liquid in the reactor is discharged into the primary settling tank 3, and the waste gas generated in the reactor is recovered and enters the steam recovery tank 2.

[0026] See Figure 1 In this invention, a system is used to prevent explosions during the discharge of materials from the reactor. The primary settling tank 3 is also connected to a steam channel, and a pressure sensor is installed on the primary settling tank 3 to monitor and maintain a slight positive pressure in real time.

[0027] The steam channel includes a waste steam channel 6, with its two ends connected to a primary settling tank 3 and a steam recovery tank 2, respectively. The steam recovery tank 2 is directly connected to the primary settling tank 3 via the waste steam channel 6, allowing all waste steam to be introduced into the primary settling tank 3. During the discharge process of the primary settling tank 3, the introduction of waste steam maintains a slight positive pressure in the primary settling tank 3, preventing external oxygen from entering and reacting with the hydrogen in the primary settling tank 3, thus avoiding a "pop" phenomenon. In existing technologies, waste steam is generally treated before being discharged and cannot be reused, resulting in energy waste. This invention introduces waste steam into the primary settling tank 3 for reuse, avoiding waste steam.

[0028] In this invention, a discharge channel is provided between the reactor 1 and the primary settling tank 3; the steam channel also includes a new steam channel 5, which is located on the discharge channel. The two ends of the new steam channel 5 are connected to the steam storage tank 4 and the discharge channel, respectively. Since the amount of waste steam recovered in the steam recovery tank 2 is not very large, when the discharge volume of the primary settling tank 3 is relatively large, the amount of waste steam introduced into the primary settling tank 3 may not be sufficient to maintain a slightly positive pressure. Therefore, in order to ensure a slightly positive pressure in the primary settling tank 3 and prevent external oxygen from entering the primary settling tank 3, the steam channel is provided with two paths. The new steam channel 5 can introduce fresh steam from the steam storage tank 4 into the primary settling tank 3 to assist the waste steam and ensure a slightly positive pressure in the primary settling tank 3.

[0029] Preferably, a steam valve 7 is provided on the new steam channel 5. The amount of new steam introduced into the primary settling tank 3 can be controlled by the steam valve 7.

[0030] Preferably, both the steam valve 7 and the pressure sensor are connected to the control system. All the waste steam in the steam recovery tank 2 is introduced into the primary settling tank 3. The pressure sensor on the primary settling tank 3 monitors the pressure in the primary settling tank 3 in real time. If the pressure in the primary settling tank 3 is positive, the steam valve 7 is closed, and there is no need to introduce new steam, thus saving energy. If the pressure in the primary settling tank 3 is negative, the pressure sensor transmits a signal to the control system, and the control system controls the steam valve 7 to open, supplementing the primary settling tank 3 with new steam. Through the combined action of new steam and waste steam, the primary settling tank 3 is maintained at a slightly positive pressure.

[0031] The slight positive pressure of the primary settling tank 3 is: the internal air pressure of the primary settling tank 3 is greater than the external atmospheric pressure, but not greater than 2 kPa. As long as the slight positive pressure is maintained, it is possible to prevent external oxygen from entering the primary settling tank 3, prevent the hydrogen in the primary settling tank 3 from reacting, and prevent the "pop" phenomenon. Therefore, there is no need to make the positive pressure value of the primary settling tank 3 too high, which would waste new steam. The control of the slight positive pressure can save energy for the entire system.

[0032] To control the occurrence of explosions, the workshop modified the original discharge system by introducing the waste steam generated by the reactor 1 into the primary settling tank 3 through a pipeline, so that the primary settling tank 3 is kept under a slight positive pressure, while avoiding the waste of waste steam.

[0033] A new steam channel 5 is added to the original discharge system, allowing fresh steam to be introduced into the primary settling tank 3. Simultaneously, the amount of fresh steam introduced is controlled by the control system to achieve energy savings.

[0034] The improvement of the above system is relatively simple and has a low cost. However, it can prevent the formation of explosive gases and ignition sources in the primary settling tank 3, thereby avoiding the occurrence of "explosion" in the primary settling tank 3, preventing equipment damage, extending the service life of the equipment, and reducing maintenance and equipment purchase costs; it can also prevent explosions of chemical reaction equipment, leakage of toxic and harmful gases, and prevent casualties and chemical accidents.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

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