Rubber cracking system and method

Abstract

The invention discloses a rubber cracking system and method, the rubber cracking system is in a closed state, a nitrogen circulation device conveys nitrogen in a nitrogen tank to a pretreatment device, a reaction device and a product collection device through a constant pressure device, and the nitrogen is recovered from the product collection device and a residue storage device; the pretreatment device is used for inputting the crushed rubber into the reaction device for cracking reaction under the nitrogen atmosphere, separating the cracked product, inputting the separated residue into the residue storage device under the nitrogen atmosphere, and carrying out rearrangement reaction on the separated product to generate a ring body; the first negative pressure device is used for extracting nitrogen in the reaction device and the product collecting device and recovering the extracted nitrogen into the nitrogen tank through the condenser; and the second negative pressure device is used for extracting nitrogen in the residue storage device, and the extracted nitrogen is recovered into the nitrogen tank through the condenser.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry, and in particular relates to a rubber cracking system and method. Background Art

[0002] With the development of industry, the use of electric cables has increased year by year, and at the same time, the amount of scrapped cables has also increased year by year. The outer sheath of electric cables is mainly made of rubber. If directly discarded, on the one hand, the rubber material is difficult to degrade, which will cause great harm to the environment. On the other hand, the production of natural rubber is increasingly restricted by forest resources and cannot meet the development needs of existing industries. Therefore, the outer sheath of electric cables is often crushed and cracked.

[0003] Thermal cracking involves heating in the presence of a catalyst to cause the cracking of a substance. The thermal cracking process of the cable sheath produces a large amount of harmful substances, which not only affects the application and value of the cracked products, but also results in severe environmental pollution due to the open feeding and discharging of existing cracking systems. This leads to high energy consumption, low efficiency, and significant safety hazards, including the risk of fire and explosion accidents. Furthermore, during tail gas treatment, the residual residue released after the cracking process not only comes into contact with air, causing flash fires and explosions, but also generates dust that pollutes the environment. Summary of the Invention

[0004] In order to solve the above technical problems, the embodiments of the present invention provide: A rubber cracking system is a sealed system comprising: a pretreatment device, a reaction device, a product collection device, a residue storage device, and a nitrogen circulation device, wherein the nitrogen circulation device comprises: a nitrogen tank, a constant pressure device, a first negative pressure device, a second negative pressure device, and a condenser; The nitrogen circulation device transports the nitrogen in the nitrogen tank to the pretreatment device, the reaction device and the product collection device through the constant pressure device, and recovers nitrogen from the product collection device and the residue storage device; The pretreatment device inputs the crushed rubber into the reaction device under a nitrogen atmosphere for cracking reaction, separates the cracked products, and inputs the separated residue into the residue storage device under a nitrogen atmosphere, and rearranges the separated product into ring bodies under a nitrogen atmosphere, and inputs the rearranged product into the product collection device; The first negative pressure device is used to extract nitrogen from the reaction device and the product collection device, complete reduced pressure distillation, and recover the extracted nitrogen into the nitrogen tank through the condenser; The second negative pressure device is used to extract the residue of the reaction device into the residue storage device, as well as the nitrogen in the residue storage device, and to recover the extracted nitrogen into the nitrogen tank through the condenser.

[0005] Furthermore, the pre-treatment device comprises: a pulverizer and a storage tank, and the nitrogen tank delivers nitrogen to the storage tank; The pulverizer is used to pulverize the rubber to form rubber particles, and transport the rubber particles to the storage tank under a nitrogen atmosphere; The storage tank is used to store the rubber particles and transport the rubber particles to the reaction device under a nitrogen atmosphere.

[0006] Furthermore, the reaction device comprises: a cracking kettle, a rearrangement kettle, a first additive tank and a second additive tank, and the nitrogen tank supplies nitrogen to the cracking kettle, the rearrangement kettle, the first additive tank and the second additive tank respectively; The first additive tank is used to add acid additives to the cracking kettle under a nitrogen atmosphere; The cracking kettle is used to perform a cracking reaction on the rubber particles transported from the storage tank under the action of acid, and after separating the products, transport them to the product collection device and the residue storage device under a nitrogen atmosphere; The second additive tank is used to add an alkali additive to the rearrangement kettle under a nitrogen atmosphere; The rearrangement kettle is used to carry out a rearrangement reaction on the product delivered from the cracking kettle under the action of alkali to generate a product, and to deliver the product to the product collecting device under a nitrogen atmosphere.

[0007] Furthermore, the first negative pressure device is used to extract nitrogen from the rearrangement kettle and the product collecting device and complete the reduced pressure distillation.

[0008] Furthermore, the residue storage device includes: a residue storage tank and a dust collector; The residue storage tank is used to store the residue separated from the cracking kettle after the reaction under a nitrogen atmosphere; The dust collector is used to remove dust from the residue in the residue storage tank.

[0009] Furthermore, the second negative pressure device is used to extract the residue of the reaction device to the residue storage device, as well as the nitrogen in the residue storage tank, and transport the nitrogen to the nitrogen tank through the condenser.

[0010] Furthermore, the dust collector includes: a cyclone dust collector and a bag dust collector.

[0011] Furthermore, the first negative pressure device and the second negative pressure device are vacuum pumps or negative pressure fans.

[0012] Furthermore, the first additive tank and the second additive tank are respectively a sulfuric acid metering tank and a potassium hydroxide metering tank.

[0013] A rubber cracking method, applied to the rubber cracking system described in claim 1, wherein the rubber cracking process comprises: The rubber is crushed by a crusher in a nitrogen atmosphere and then stored in a nitrogen-filled storage tank; The rubber particles in the storage tank are transported to a cracking kettle filled with nitrogen, and cracked under the action of acid, and the reaction products are separated to obtain product products and residues; The product is transported to a rearrangement kettle filled with nitrogen, and rearrangement reaction is carried out under the action of alkali, and the obtained ring body is transported to a product collection device filled with nitrogen; The residue separated from the cracking kettle is input into a residue storage tank filled with nitrogen; The first negative pressure device and the second negative pressure device are used to extract nitrogen from the cracking kettle and the residue storage tank respectively, and the nitrogen is recovered into the nitrogen tank through the condenser.

[0014] This application utilizes a nitrogen circulation device to transport nitrogen to the devices used in various stages of rubber processing, and recovers nitrogen from the product collection device and residue storage device, so that the rubber cracking system forms a nitrogen-sealed state. The entire production process is oxygen-free. While nitrogen is transported under a combination of positive and negative pressure, it is also recycled and reused. This achieves zero tail gas emissions. When the residue is discharged after the residual cracking is completed, it will not come into contact with the air, causing flash fires and flash explosions; nor will it cause dust pollution. In addition, the nitrogen can be recycled, reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of a rubber cracking system provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of another rubber cracking system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] like Figure 1As shown, the present invention provides a rubber cracking system, which is in a closed state and includes: a pretreatment device, a reaction device, a product collection device, a residue storage device and a nitrogen circulation device, wherein the nitrogen circulation device includes: a nitrogen tank, a constant pressure device, a first negative pressure device, a second negative pressure device and a condenser; The nitrogen circulation device transports the nitrogen in the nitrogen tank to the pretreatment device, the reaction device and the product collection device through the constant pressure device, and recovers nitrogen from the product collection device and the residue storage device; The pretreatment device inputs the crushed rubber into the reaction device under a nitrogen atmosphere for cracking reaction, separates the cracking products, and inputs the separated residue into the residue storage device under a nitrogen atmosphere. The separated product is rearranged to form a ring body under a nitrogen atmosphere and input into the product collection device; The first negative pressure device is used to extract nitrogen from the reaction device and the product collection device, and complete the reduced pressure distillation, and recover the extracted nitrogen into the nitrogen tank through the condenser; The second negative pressure device is used to extract the residue of the reaction device to the residue storage device, as well as the nitrogen in the residue storage device, and to recover the extracted nitrogen into the nitrogen tank through the condenser.

[0019] The rubber described in this application may be silicone rubber, rubber products, etc.

[0020] This application utilizes a nitrogen circulation device to transport nitrogen to the devices used in various stages of rubber processing, and recovers nitrogen from the product collection device and residue storage device, so that the rubber cracking system forms a nitrogen-sealed state. The entire production process is oxygen-free. While nitrogen is transported under a combination of positive and negative pressure, it is also recycled and reused. This achieves zero tail gas emissions. When the residue is discharged after the residual cracking is completed, it will not come into contact with the air, causing flash fires and flash explosions; nor will it cause dust pollution. In addition, the nitrogen can be recycled, reducing energy consumption.

[0021] Another embodiment of the present invention, as Figure 2 As shown, the pretreatment device includes: a crusher and a storage tank, and the nitrogen tank delivers nitrogen to the storage tank; The pulverizer is used to crush the rubber into rubber pellets, which are then transported to a storage tank under a nitrogen atmosphere. The storage tank is used to store the rubber pellets and transport them to the reaction device under a nitrogen atmosphere. In this embodiment, the crushed rubber is transported to the storage tank for temporary storage using nitrogen, eliminating the need for manual transfer.

[0022] The reaction device includes: a cracking kettle, a rearrangement kettle, a first additive tank and a second additive tank. The nitrogen tank supplies nitrogen to the cracking kettle, the rearrangement kettle, the first additive tank and the second additive tank respectively; the first additive tank is used to add an acid additive to the cracking kettle under a nitrogen atmosphere; the cracking kettle is used to perform a cracking reaction on the rubber particles transported from the storage tank under the action of acid, and after separating the products, transport them to a product collection device and a residue storage device under a nitrogen atmosphere; the second additive tank is used to add an alkali additive to the rearrangement kettle under a nitrogen atmosphere; the rearrangement kettle is used to perform a rearrangement reaction on the products transported from the cracking kettle under the action of alkali to generate products, and transport the products to the product collection device under a nitrogen atmosphere.

[0023] In the embodiment of the present invention, the acid used can be any acidic substance that is conducive to the cracking reaction. Preferably, sulfuric acid is used in this embodiment. Similarly, the base can be any alkaline substance, such as potassium hydroxide, sodium hydroxide, magnesium hydroxide, etc., and potassium hydroxide is used in this embodiment. The first additive tank and the second additive tank are respectively a sulfuric acid metering tank and a potassium hydroxide metering tank.

[0024] In the embodiment of the present invention, the colloid particles are transported into the cracking kettle by nitrogen, which eliminates the need for manual feeding and prevents oxygen from entering the cracking kettle.

[0025] Furthermore, the first negative pressure device is used to extract nitrogen from the rearrangement kettle and the product collecting device and complete the reduced pressure distillation. The first negative pressure device can use a vacuum pump, which can not only extract nitrogen from the rearrangement kettle and the product collecting device, but also form a negative pressure inside the entire rubber processing system, which is beneficial to the input of nitrogen in the nitrogen tank, and can also recover nitrogen.

[0026] Furthermore, the residue storage device includes: a residue storage tank and a dust collector; the residue storage tank is used to store the residue separated from the cracking kettle after the reaction under a nitrogen atmosphere; the dust collector is used to remove dust from the residue in the residue storage tank.

[0027] like Figure 2 As shown, the dust collector includes: cyclone dust collector and bag dust collector.

[0028] The second negative pressure device is used to extract the residue from the reaction device to the residue storage device and the nitrogen in the residue storage tank, and transport the nitrogen to the nitrogen tank through the condenser. The second negative pressure device is selected as a negative pressure fan.

[0029] In this embodiment of the present invention, the pyrolysis residue enters the storage tank in a fully enclosed state through the action of positive-pressure nitrogen and a negative-pressure blower. This avoids the environmental and safety hazards associated with open discharge. The slag discharge no longer requires cooling or adding water, achieving high-temperature slag discharge. This shortens the production cycle while maintaining a constant temperature and reducing energy consumption.

[0030] In one embodiment of the present invention, two condensers can be selected, one connected to the first negative pressure device to recover nitrogen from the re-beating kettle and the product collecting device, and the other condenser connected to the second negative pressure device to recover nitrogen from the residue storage tank.

[0031] The present invention further provides a rubber cracking method, which is applied to the rubber cracking system of the above embodiment. The rubber cracking process includes: Step 1: Use a crusher to crush the rubber and store it in a nitrogen-filled storage tank; Step 2: transport the rubber particles in the storage tank to a cracking kettle filled with nitrogen, and perform a cracking reaction under the action of acid, and separate the reaction products to obtain product products and residues; Step 3: transporting the product to a rearrangement kettle filled with nitrogen, and carrying out rearrangement reaction under the action of alkali, and transporting the obtained ring body to a product collection device filled with nitrogen; Step 4: The residue separated from the cracking kettle is input into a residue storage tank filled with nitrogen; Step 5: Use the first negative pressure device and the second negative pressure device to extract nitrogen from the cracking kettle and the residue storage tank respectively, and recover it into the nitrogen tank through the condenser.

[0032] The above descriptions are only partial embodiments of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

[0033] The above content is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A rubber cracking system, characterized in that: The rubber cracking system is in a closed state and includes: a pretreatment device, a reaction device, a product collection device, a residue storage device and a nitrogen circulation device, wherein the nitrogen circulation device includes: a nitrogen tank, a constant pressure device, a first negative pressure device, a second negative pressure device and a condenser; The nitrogen circulation device transports the nitrogen in the nitrogen tank to the pretreatment device, the reaction device and the product collection device through the constant pressure device, and recovers nitrogen from the product collection device and the residue storage device; The pretreatment device inputs the crushed rubber into the reaction device under a nitrogen atmosphere for cracking reaction, separates the cracked products, and inputs the separated residue into the residue storage device under a nitrogen atmosphere, and rearranges the separated product into ring bodies under a nitrogen atmosphere, and inputs the rearranged product into the product collection device; The first negative pressure device is used to extract nitrogen from the reaction device and the product collection device, and complete the reduced pressure distillation, and recover the extracted nitrogen into the nitrogen tank through the condenser; The second negative pressure device is used to extract the residue of the reaction device into the residue storage device, as well as the nitrogen in the residue storage device, and to recover the extracted nitrogen into the nitrogen tank through the condenser.

2. The rubber cracking system according to claim 1, characterized in that: The pre-treatment device comprises: a pulverizer and a storage tank, and the nitrogen tank delivers nitrogen to the storage tank; The pulverizer is used to pulverize the rubber to form rubber particles, and transport the rubber particles to the storage tank under a nitrogen atmosphere; The storage tank is used to store the rubber particles and transport the rubber particles to the reaction device under a nitrogen atmosphere.

3. The rubber cracking system according to claim 2, characterized in that: The reaction device comprises: a cracking kettle, a rearrangement kettle, a first additive tank and a second additive tank, and the nitrogen tank supplies nitrogen to the cracking kettle, the rearrangement kettle, the first additive tank and the second additive tank respectively; The first additive tank is used to add acid additives to the cracking kettle under a nitrogen atmosphere; The cracking kettle is used to perform a cracking reaction on the rubber particles transported from the storage tank under the action of acid, and after separating the products, transport them to the product collection device and the residue storage device under a nitrogen atmosphere; The second additive tank is used to add an alkali additive to the rearrangement kettle under a nitrogen atmosphere; The rearrangement kettle is used to carry out a rearrangement reaction on the product delivered from the cracking kettle under the action of alkali to generate a product, and to deliver the product to the product collecting device under a nitrogen atmosphere.

4. The rubber cracking system according to claim 3, characterized in that: The first negative pressure device is used to extract nitrogen from the rearrangement kettle and the product collecting device and complete the reduced pressure distillation.

5. The rubber cracking system according to claim 4, characterized in that: The residue storage device includes: a residue storage tank and a dust collector; The residue storage tank is used to store the residue separated from the cracking kettle after the reaction under a nitrogen atmosphere; The dust collector is used to remove dust from the residue in the residue storage tank.

6. The rubber cracking system according to claim 1, characterized in that: The second negative pressure device is used to extract the residue of the reaction device to the residue storage device and the nitrogen in the residue storage tank, and transport the nitrogen to the nitrogen tank through the condenser.

7. The rubber cracking system according to claim 6, characterized in that: The dust collector includes: a cyclone dust collector and a bag dust collector.

8. The rubber cracking system according to claim 1, characterized in that: The first negative pressure device and the second negative pressure device are vacuum pumps or negative pressure fans.

9. The rubber cracking system according to claim 3, characterized in that: The first additive tank and the second additive tank are respectively a sulfuric acid metering tank and a potassium hydroxide metering tank.

10. A rubber cracking method, characterized in that: Applicable to the rubber cracking system according to any one of claims 1 to 9, the rubber cracking process comprising: The rubber is crushed by a crusher and stored in a nitrogen-filled storage tank; The rubber particles in the storage tank are transported to a cracking kettle filled with nitrogen, and cracked under the action of acid, and the reaction products are separated to obtain product products and residues; The product is transported to a rearrangement kettle filled with nitrogen, and rearrangement reaction is carried out under the action of alkali, and the obtained ring body is transported to a product collection device filled with nitrogen; The residue separated from the cracking kettle is input into a residue storage tank filled with nitrogen; The first negative pressure device and the second negative pressure device are used to extract nitrogen from the cracking kettle and the residue storage tank respectively, and the nitrogen is recovered into the nitrogen tank through the condenser.

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