A vacuum device for oxidation crystallizer

Abstract

The invention discloses an oxidation crystallizer vacuum pumping device, which belongs to the technical field of vacuum pumping devices and also includes a vacuum pumping device arranged on one side of the oxidation crystallizer. The vacuum pumping device includes a liquid ring vacuum pump, an oxidation crystallizer condenser, a gas-liquid separator and a sealing liquid pump. The bottom of the gas-liquid separator is connected to the upper part of the oxidation crystallizer through a pipeline, the sealing liquid pump inlet is connected to the bottom of the oxidation crystallizer condenser through a pipeline, and the sealing liquid pump outlet is connected to the liquid ring vacuum pump through a pipeline. A mother liquid circulation tank pipeline is provided on the pipeline between the sealing liquid pump and the liquid ring vacuum pump. The invention not only condenses and recovers the steam extracted by the oxidation condenser during vacuuming, but also, on the premise of ensuring that the gas phase in the steam does not flow back, transmits part of the liquid condensed from the steam liquid phase to the downstream and the other part to the liquid ring vacuum pump for use as a replenishing liquid. The liquid phase in the steam is recovered without increasing a water source as a replenishing liquid for the liquid ring vacuum pump, thereby saving energy consumption and reducing waste of resources.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumping devices, in particular to a vacuum pumping device for an oxidation crystallizer. Background Art

[0002] The process involves using a steam ejector to evacuate the oxidation crystallizer. Flash steam or medium-pressure steam from the first crystallizer is used as the steam ejector's power source. Flash steam is ejected from the nozzle at near-sonic speed. During the ejection process, the steam's static pressure energy is converted into kinetic energy, reducing the pressure and creating a vacuum, which entrains and extracts gas from the crystallizer. The extracted air mixes with the steam ejected from the nozzle and enters the diffusion chamber, where its velocity gradually decreases while its pressure increases, before being ejected from the outlet. The vacuum level in the crystallizer is adjusted by controlling the position of the crystallizer's gas phase control valve.

[0003] The existing technology has the following deficiencies: the operation of the liquid ring vacuum pump also requires additional liquid replenishment, which increases resource consumption. At the same time, when the steam is lost, the vacuum in the crystallizer cannot be maintained, resulting in overpressure in the crystallizer and damage to the bursting disc. The bursting disc is made of titanium, has high manufacturing costs, and cannot be replaced online. The steam ejector outlet requires a cooler to condense the steam. The cooler is made of titanium, which is expensive. The pressure of the condensed fluid is low and needs to flow to the downstream equipment by gravity, resulting in a high installation height of the steam ejector and high steel structure cost. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the above background technology, the present invention provides an oxidation crystallizer vacuum pumping device, and the technical solution adopted is as follows:

[0005] It includes an oxidation crystallizer, which is characterized in that it also includes a vacuum pumping device arranged on one side of the oxidation crystallizer, the vacuum pumping device includes a liquid ring vacuum pump, an oxidation crystallizer condenser, a gas-liquid separator and a sealing liquid pump, the outlet of the liquid ring vacuum pump is connected to the left side of the oxidation crystallizer condenser through a pipeline, the inlet of the liquid ring vacuum pump is connected to the right side of the gas-liquid separator through a pipeline, the upper part of the gas-liquid separator is connected to the upper part of the oxidation crystallizer through a pipeline, the bottom of the gas-liquid separator is connected to the upper part of the oxidation crystallizer through a pipeline, the inlet of the sealing liquid pump is connected to the bottom of the oxidation crystallizer condenser through a pipeline, the outlet of the sealing liquid pump is connected to the liquid ring vacuum pump through a pipeline, and a mother liquor circulation tank pipeline is provided on the pipeline between the sealing liquid pump and the liquid ring vacuum pump.

[0006] Preferably, a pipeline to a low-pressure absorption tower is provided on the upper portion of the oxidation crystallizer condenser.

[0007] Preferably, one side of the oxidation crystallizer is connected to the first oxidation crystallizer through a pipeline, and one side of the first oxidation crystallizer is connected to the second oxidation crystallizer through a pipeline.

[0008] Preferably, one side of the second oxidation crystallizer is connected to an oxidation reactor via a pipeline.

[0009] Preferably, the bottom of the oxidation crystallizer is connected to a slurry delivery pump via a pipeline, and the slurry delivery pump is connected to an oxidation filter via a pipeline.

[0010] Preferably, the bottom of the oxidation filter is connected to a refined pulping tank via a pipeline.

[0011] Preferably, a stirrer is provided in the oxidation crystallizer, the first oxidation crystallizer, the second oxidation crystallizer, the oxidation reactor and the refined pulping tank.

[0012] The present invention has the following advantages:

[0013] 1. Reduce investment costs: Using a liquid ring vacuum pump can reduce the overall steel structure height and reduce the need for a titanium steam heat exchanger.

[0014] 2. Stable operation: Fluctuations in the system vacuum degree caused by steam fluctuations or liquid evaporation can be avoided during operation.

[0015] 3. Precise control: The vacuum degree can be precisely controlled by adjusting the frequency of the vacuum pump.

[0016] 4. Reduced steam consumption: Steam consumption and circulating water volume are reduced, reducing operating costs.

[0017] 5. Noise control: The steam ejector will make a lot of noise during operation, which can be improved by using a liquid ring vacuum pump.

[0018] 6. Ensure product quality: Stable vacuum degree is conducive to the forward reaction, ensuring crystallinity and product purity, and avoiding rework and return of materials due to unqualified product quality.

[0019] 7. Through the liquid ring vacuum pump, oxidation crystallizer condenser, gas-liquid separator and sealing liquid pump, when the steam in the oxidation crystallizer is extracted by the liquid ring vacuum pump, the steam is mixed with the liquid in the liquid ring vacuum pump and sent to the oxidation crystallizer condenser for condensation. The liquid phase in the steam becomes liquid and remains in the oxidation crystallizer condenser, while the gas phase is discharged from the upper part of the oxidation crystallizer. A part of the liquid in the oxidation crystallizer condenser is transported to the downstream through the liquid sealing pump, and the other part is provided to the liquid ring vacuum pump for circulation as a replenishing liquid. Moreover, when the liquid is transported through the liquid sealing pump, the gas phase in the oxidation crystallizer condenser will not be brought over. The present invention not only condenses and recovers the steam extracted by the oxidation condenser by vacuum pumping, but also, on the premise of ensuring that the gas phase in the steam does not flow back, a part of the liquid condensed from the steam liquid phase is transported to the downstream, and the other part is transported to the liquid ring vacuum pump for use as a replenishing liquid. The liquid phase in the steam is recovered without increasing the water source as the replenishing liquid of the liquid ring vacuum pump, thereby saving energy consumption and reducing waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the present invention.

[0021] Figures: 1 oxidation crystallizer, 2 liquid ring vacuum pump, 3 oxidation crystallizer condenser, 4 gas-liquid separator, 5 sealing liquid pump, 6 first oxidation crystallizer, 7 second oxidation crystallizer, 8 oxidation reactor, 9 slurry delivery pump, 10 oxidation filter, 11 refined pulping tank. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The present invention provides an oxidation crystallizer vacuum pumping device, comprising an oxidation crystallizer 1, and also comprising a vacuum pumping device arranged on one side of the oxidation crystallizer 1, the vacuum pumping device extracts the steam generated in the oxidation crystallizer 1, the vacuum pumping device comprises a liquid ring vacuum pump 2, an oxidation crystallizer condenser 3, a gas-liquid separator 4 and a liquid sealing pump 5, the liquid ring vacuum pump 2 uses liquid as a working medium to form a liquid ring in the pump body, the steam in the oxidation crystallizer 1 is extracted by the liquid ring vacuum pump 2, so that a vacuum is formed in the oxidation crystallizer 1, the outlet of the liquid ring vacuum pump 2 is connected to the left side of the oxidation crystallizer condenser 3 through a pipeline, the liquid ring vacuum pump 2 draws steam into the oxidation crystallizer condenser 3, so that the liquid phase in the steam is condensed into liquid and remains in the oxidation crystallizer condenser 3, the inlet of the liquid ring vacuum pump 2 is connected to the right side of the gas-liquid separator 4 through a pipeline, and a part of the liquid phase carried in the extracted steam is intercepted by the gas-liquid separator 4 to prevent excessive outflow of the liquid phase, and the gas-liquid separation The upper part of the separator 4 is connected to the upper part of the oxidation crystallizer 1 through a pipeline. Steam generated in the oxidation crystallizer 1 and a part of the liquid phase carried by the steam enter the upper part of the oxidation crystallizer 1 through the pipeline, and then enters the oxidation crystallizer 1. The bottom of the gas-liquid separator 4 is connected to the upper part of the oxidation crystallizer 1 through a pipeline. A part of the liquid phase carried in the steam is separated by the gas-liquid separator 4 and flows back to the oxidation crystallizer 1 through the pipeline through the bottom of the gas-liquid separator 4. The inlet of the sealing liquid pump 5 is connected to the bottom of the oxidation crystallizer condenser 3 through a pipeline. The liquid in the oxidation crystallizer condenser 3 is pumped out by the sealing liquid pump 5, a part of which is pumped into the mother liquid circulation tank pipeline, and then goes to the mother liquid tank circulation tank, and the other part is sent to the liquid ring vacuum pump 2 as a make-up liquid. At the same time, the gas phase in the steam in the oxidation crystallizer condenser 3 will not be brought out by the sealing liquid pump 5, and the sealing liquid pump 5 outlet is connected to the liquid ring vacuum pump 2 through a pipeline. A mother liquid circulation tank pipeline is provided on the pipeline between the sealing liquid pump 5 and the liquid ring vacuum pump 2.

[0024] A pipeline to a low-pressure absorption tower is provided on the upper part of the oxidation crystallizer condenser 3. The liquid phase of the steam entering the oxidation crystallizer condenser 3 is condensed into liquid, and the gas phase is separated and enters the low-pressure absorption tower through the pipeline to the low-pressure absorption tower on the upper part of the oxidation crystallizer condenser 3.

[0025] One side of the oxidation crystallizer 1 is connected to the first oxidation crystallizer 6 through a pipeline, and one side of the first oxidation crystallizer 6 is connected to the second oxidation crystallizer 7 through a pipeline. The first oxidation crystallizer 6 and the second oxidation crystallizer 7 are connected to the oxidation crystallizer 1, so that the production efficiency is higher.

[0026] One side of the second oxidation crystallizer 7 is connected to an oxidation reactor 8 through a pipeline. After the raw material reacts in the oxidation reactor 8, it enters the second oxidation crystallizer 7 and then enters the first oxidation crystallizer 6 and the oxidation crystallizer 1 in sequence.

[0027] The bottom of the oxidation crystallizer 1 is connected to a slurry delivery pump 9 through a pipeline, and the slurry delivery pump 9 is connected to an oxidation filter 10 through a pipeline. The liquid generated in the oxidation crystallizer 1 is delivered to the oxidation filter 10 through the slurry delivery pump 9, and the slurry is oxidized and filtered.

[0028] The bottom of the oxidation filter 10 is connected to a refining and beating tank 11 through a pipeline, and the slurry after oxidation and filtration in the oxidation filter 10 enters the refining and beating tank 11 for refining and beating.

[0029] Agitators are provided in the oxidation crystallizer 1, the first oxidation crystallizer 6, the second oxidation crystallizer 7, the oxidation reactor 8 and the refined beating tank 11, so that each production process of the oxidation crystallizer 1, the first oxidation crystallizer 6, the second oxidation crystallizer 7, the oxidation reactor 8 and the refined beating tank 11 can be stirred evenly.

[0030] Working principle of the present invention:

[0031] After the raw materials react in the oxidation reactor 8, they enter the second oxidation crystallizer 7, the first oxidation crystallizer 6 and the oxidation crystallizer 1 in sequence through the pipeline. The steam produced in the oxidation crystallizer 1 and a part of the liquid phase carried by the steam enter the gas-liquid separator 4 through the pipeline through the upper part of the gas-liquid separator 4 under the negative pressure adsorption of the liquid ring vacuum pump 2. The carried liquid phase is separated by the gas-liquid separator 4 and returns to the oxidation crystallizer 1 through the bottom of the gas-liquid separator 4 through the pipeline, and the steam is pumped into the oxidation crystallizer condenser 3 through the pipeline through the liquid ring vacuum pump 2, so that the liquid phase in the steam is condensed into liquid and remains in the oxidation crystallizer condenser 3, while the gas phase enters the low-pressure absorption tower through the pipeline to the low-pressure absorption tower at the upper part of the oxidation crystallizer condenser 3. The liquid in the oxidation crystallizer condenser 3 is pumped into the mother liquid circulation tank pipeline by the sealing liquid pump 5 through the pipeline at the bottom, and then goes to the mother liquid tank circulation tank, and the other part is sent to the liquid ring vacuum pump 2 as a replenishing liquid.

[0032] The present invention is simple to operate, easy to use, and suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oxidation crystallizer vacuum pumping device, comprising an oxidation crystallizer (1), characterized in that: The invention also includes a vacuum pumping device arranged on one side of the oxidation crystallizer (1), the vacuum pumping device including a liquid ring vacuum pump (2), an oxidation crystallizer condenser (3), a gas-liquid separator (4) and a sealing liquid pump (5), the outlet of the liquid ring vacuum pump (2) is connected to the left side of the oxidation crystallizer condenser (3) through a pipeline, the inlet of the liquid ring vacuum pump (2) is connected to the right side of the gas-liquid separator (4) through a pipeline, the upper part of the gas-liquid separator (4) is connected to the upper part of the oxidation crystallizer (1) through a pipeline, the bottom of the gas-liquid separator (4) is connected to the upper part of the oxidation crystallizer (1) through a pipeline, the inlet of the sealing liquid pump (5) is connected to the bottom of the oxidation crystallizer condenser (3) through a pipeline, the outlet of the sealing liquid pump (5) is connected to the liquid ring vacuum pump (2) through a pipeline, and a mother liquid circulation tank pipeline is provided on the pipeline between the sealing liquid pump (5) and the liquid ring vacuum pump (2); The steam is pumped into the oxidation crystallizer condenser (3) through the pipeline via the liquid ring vacuum pump (2), so that the liquid phase in the steam is condensed into liquid and remains in the oxidation crystallizer condenser (3), while the gas phase enters the low-pressure absorption tower through the pipeline to the low-pressure absorption tower at the upper part of the oxidation crystallizer condenser (3). A portion of the liquid in the oxidation crystallizer condenser (3) is pumped into the pipeline to the mother liquid circulation tank by the sealing liquid pump (5) through the pipeline at the bottom, and then goes to the mother liquid tank circulation tank, and the other portion is sent to the liquid ring vacuum pump (2) as a supplementary liquid; One side of the oxidation crystallizer (1) is connected to a first oxidation crystallizer (6) via a pipeline, and one side of the first oxidation crystallizer (6) is connected to a second oxidation crystallizer (7) via a pipeline; One side of the second oxidation crystallizer (7) is connected to an oxidation reactor (8) via a pipeline; The bottom of the oxidation crystallizer (1) is connected to a slurry delivery pump (9) via a pipeline, and the slurry delivery pump (9) is connected to an oxidation filter (10) via a pipeline; The bottom of the oxidation filter (10) is connected to a refined pulping tank (11) via a pipeline.

2. The oxidation crystallizer vacuum pumping device according to claim 1, characterized in that: A pipeline to a low-pressure absorption tower is provided on the upper portion of the oxidation crystallizer condenser (3).

3. The oxidation crystallizer vacuum pumping device according to claim 2, characterized in that: Agitators are provided in the oxidation crystallizer (1), the first oxidation crystallizer (6), the second oxidation crystallizer (7), the oxidation reactor (8) and the refined pulping tank (11).

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