CN216062644U

CN216062644U - Solvent purification and freezing crystallization desalination device

Info

Publication number: CN216062644U
Application number: CN202122675379.4U
Authority: CN
Inventors: 杨国庆
Original assignee: Zhejiang Cangchuang Environmental Technology Co ltd
Current assignee: Zhejiang Cangchuang Environmental Technology Co ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-03-18
Anticipated expiration: 2031-11-04

Abstract

The utility model discloses a solvent purification and freezing crystallization desalting device, which comprises a primary filtering system, a secondary filtering system, a tertiary filtering system, a resin adsorption system, a crystallization kettle, a freezing unit, a centrifugal machine and an electric pump, wherein one side of the primary filtering system is fixedly connected with the top end of the secondary filtering system through a pipeline, one side of the secondary filtering system is fixedly connected with the top end of the tertiary filtering system through a pipeline, one side of the tertiary filtering system is fixedly connected with the top end of the resin adsorption system through a pipeline, and one end of the electric pump is fixedly connected with one side of the resin adsorption system; this solvent purifies and freeze crystallization desalination device can reach and improve desulfurization efficiency through being provided with one-level filtration system, second grade filtration system, tertiary filtration system, resin adsorption system, crystallization kettle, refrigerating unit, centrifuge and electric pump, makes flue gas discharge to reach standard, can not the polluted environment, and the running cost is low simultaneously, reduced the purpose that the waste liquid discharged.

Description

Solvent purification and freezing crystallization desalination device

Technical Field

The utility model relates to the technical field of flue gas treatment in a sulfur recovery device and a smelting industry in the petrochemical industry, in particular to a solvent purification and freezing crystallization desalting device.

Background

A sulfur dioxide recovery method is adopted for treating the flue gas of a sulfur recovery device and a smelting industry in the petrochemical industry. The tail gas absorption-regeneration system absorbs and removes S02 in the tail gas by using a sulfur dioxide absorbent, thereby ensuring that the flue gas S02 reaches the standard and is discharged. The solvent purification, freezing, crystallization and desalination device is a key device of a tail gas absorption-regeneration system, and is mainly used for removing stable salts in the tail gas sulfur dioxide absorbent by using resin, particularly for removing stable salts containing sulfate radicals, sulfite radicals, thiosulfate radicals, chloride ions, fluoride ions and the like, and then removing various sodium salts in a solution by using a freezing and crystallization device, so that the sulfur dioxide absorbent can continuously and effectively remove S02 in the tail gas.

The prior art has the following defects or problems:

1. the desulfurizer of the existing crystallization desalting device is frequently replaced, so that the operation cost is high, the discharge amount of waste liquid is large, and the discharge amount of sulfur in flue gas exceeds the standard.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a solvent purification and freeze crystallization desalination device aiming at the defects in the prior art so as to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a solvent purifies and freeze crystallization desalination device, includes one-level filtration system, second grade filtration system, tertiary filtration system, resin adsorption system, crystallization kettle, refrigerating unit, centrifuge and motor pump, pipeline and second grade filtration system top fixed connection are passed through to one-level filtration system one side, pipeline and tertiary filtration system top fixed connection are passed through to second grade filtration system one side, pipeline and resin adsorption system top fixed connection are passed through to tertiary filtration system one side, one end and one side fixed connection of resin adsorption system of motor pump, one side fixed connection of the other end of motor pump and crystallization kettle, one side fixed connection of pipeline and crystallization kettle is passed through to one side of refrigerating unit, one side fixed connection of pipeline and centrifuge is passed through to crystallization kettle one side.

As a preferred technical scheme of the utility model, a plurality of polypropylene coarse and fat filter elements are filled in the primary filtering system, and the filtering precision of the filter elements is 10 microns.

As a preferred technical scheme of the utility model, a plurality of poly-active carbon filter elements are filled in the secondary filtering system.

As a preferred technical scheme of the utility model, a plurality of polypropylene coarse and fat filter elements are filled in the three-stage filtration system, and the filtration precision of the filter elements is 1 micron.

In a preferred embodiment of the present invention, the resin adsorption system is filled with an acrylic acid-based strongly basic anion exchange resin.

As a preferred technical scheme of the utility model, the tank body of the crystallization kettle is made of 316L, the cooling net volume of the solvent is more than 3m3, and the crystallization kettle is provided with a stirrer and an internal cooling jacket.

In a preferred embodiment of the present invention, the centrifuge is made of S316 material and has a spray nozzle.

Compared with the prior art, the utility model provides a solvent purification and freeze crystallization desalination device, which has the following beneficial effects:

1. the desalting device for solvent purification and freezing crystallization is provided with a primary filtering system, a secondary filtering system, a tertiary filtering system, a resin adsorption system, a crystallization kettle, a freezing unit, a centrifugal machine and an electric pump, an organic amine solvent to be treated sequentially passes through the primary filtering system, the secondary filtering system, the tertiary filtering system and the resin adsorption system for purification treatment, then the solvent passes through the crystallization kettle and the centrifugal machine to remove harmful sodium salt generated in the solvent, energy is provided by the freezing unit, after harmful substances are adsorbed by the resin through the resin adsorption system and a regenerant storage tank, the ineffective resin is regenerated through the regenerant, regenerated waste liquid is discharged and treated, the organic amine solvent is purified by adopting the means of adsorption filtration, ion exchange, freezing crystallization and the like, the PH value of the solvent is increased, and degraded substances, suspended substances, water and the like can be effectively removed, The degradation product is oxidized to reach various physical and chemical indexes of the fresh solvent, the device can improve the desulfurization efficiency, the smoke is discharged up to the standard, the environment is not polluted, the operation cost is low, and the waste liquid discharge is reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1. a primary filtration system; 2. a secondary filtration system; 3. a tertiary filtration system; 4. a resin adsorption system; 5. a crystallization kettle; 6. a refrigerating unit; 7. a centrifuge; 8. an electric pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-1, in the present embodiment: a solvent purification and freeze crystallization desalination device comprises a first-stage filtration system 1, a second-stage filtration system 2, a third-stage filtration system 3 and a resin adsorption system 4, crystallization kettle 5, refrigerating unit 6, centrifuge 7 and electric pump 8, 2 top fixed connection of pipeline and second grade filtration system are passed through to 1 one side of one-level filtration system, 2 top fixed connection of pipeline and tertiary filtration system are passed through to 2 one side of second grade filtration system, 3 top fixed connection of pipeline and resin adsorption system are passed through to 3 one side of tertiary filtration system, one end and resin adsorption system 4's one side fixed connection of electric pump 8, the other end and crystallization kettle 5's one side fixed connection of electric pump 8, resin adsorption system 4 can squeeze into crystallization kettle 5 with the solvent through electric pump 8 in, pipeline and crystallization kettle 5's one side fixed connection are passed through to one side of refrigerating unit 6, one side fixed connection of pipeline and centrifuge 7 is passed through to crystallization kettle 5 one side.

In this embodiment, the first-stage filtration system 1 is filled with a plurality of polypropylene coarse filtration cores, the filtration precision of the filtration cores is 10 microns, and the first-stage filtration system 1 is coarse filtration, which is beneficial to filtering out various suspended matters. The secondary filtering system 2 is internally filled with a plurality of polymerized activated carbon filter elements which are made of coconut shells and are beneficial to removing oil and hydrocarbon substances. The three-stage filtering system 3 is filled with a plurality of polypropylene thick and fat filter elements, the filtering precision of the filter elements is 1 micron, and the filtering system is favorable for filtering fine-particle impurities and protecting subsequent working sections. The resin adsorption system 4 is filled with acrylic acid series strong base anion exchange resin, so that the resin is easy to adsorb and resolve under specific environment. The groove body of the crystallization kettle 5 is made of 316L, the cooling net volume of the solvent is more than 3m3, and a stirrer and an internal cooling jacket are arranged to facilitate crystallization. The centrifuge 7 is made of S316 material, and is provided with a spray washing water nozzle inside, so as to be convenient for cleaning.

The working principle and the using process of the utility model are as follows: when the organic amine solvent treatment device is used, the organic amine solvent to be treated sequentially passes through the primary filtering system 1, the secondary filtering system 2, the tertiary filtering system 3 and the resin adsorption system 4, the treated solution returns to the circulating system, part of the solvent is pumped into the crystallization kettle 5, and the specific throughput is controlled by the flow. The refrigerating unit 6 starts to work, a refrigerant is injected into a jacket of the crystallization kettle 5, the crystallized substances in the crystallization kettle 5 flow into the centrifuge 7 through operation for a period of time, the dehydrated sodium salt crystals are packaged and bagged, pressure switches can be arranged on the primary filtering system 1, the secondary filtering system 2 and the tertiary filtering system 3, when the pressure drop is larger than a set value, the filter element needs to be replaced, and the degraded substances and suspended matters can be effectively removed;

the system is adopted to treat the poor-quality organic amine solvent, the total amount of the organic amine solvent is more than 100 tons, the circulating amount is 70 tons/hour, the flue gas desulfurization and purification system uses filtration and anion exchange resin to carry out ion exchange to remove acidic impurities in the solvent, the treatment capacity is 3 tons/hour, the current operation is maintained at 2 tons/hour, each circulating period of the freezing and crystallizing device is less than 4 hours, and the removal amount of sodium salt is more than 60 kg/cycle. The PH value of the organic amine solvent is maintained above 5.5, the whole desulfurization system operates normally, and the condition that the sulfur exceeds the standard does not occur in the flue gas emission.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A solvent purification and freeze crystallization desalination apparatus, characterized by: comprises a primary filtering system (1), a secondary filtering system (2), a tertiary filtering system (3), a resin adsorption system (4), a crystallization kettle (5), a refrigerating unit (6), a centrifuge (7) and an electric pump (8), wherein one side of the primary filtering system (1) is fixedly connected with the top end of the secondary filtering system (2) through a pipeline, one side of the secondary filtering system (2) is fixedly connected with the top end of the tertiary filtering system (3) through a pipeline, one side of the tertiary filtering system (3) is fixedly connected with the top end of the resin adsorption system (4) through a pipeline, one end of the electric pump (8) is fixedly connected with one side of the resin adsorption system (4), the other end of the electric pump (8) is fixedly connected with one side of the crystallization kettle (5), one side of the refrigerating unit (6) is fixedly connected with one side of the crystallization kettle (5) through a pipeline, one side of the crystallization kettle (5) is fixedly connected with one side of the centrifugal machine (7) through a pipeline.

2. A solvent purification and freeze crystallization desalination plant as claimed in claim 1 wherein: a plurality of polypropylene thick filter elements are filled in the primary filtering system (1), and the filtering precision of the filter elements is 10 microns.

3. A solvent purification and freeze crystallization desalination plant as claimed in claim 1 wherein: and a plurality of poly-active carbon filter elements are filled in the secondary filtering system (2).

4. A solvent purification and freeze crystallization desalination plant as claimed in claim 1 wherein: and a plurality of polypropylene thick filter elements are filled in the three-stage filtering system (3), and the filtering precision of the filter elements is 1 micron.

5. A solvent purification and freeze crystallization desalination plant as claimed in claim 1 wherein: and acrylic acid series strong base anion exchange resin is filled in the resin adsorption system (4).

6. A solvent purification and freeze crystallization desalination plant as claimed in claim 1 wherein: the tank body of the crystallization kettle (5) is made of 316L, the cooling net volume of the solvent is more than 3m3, and the crystallization kettle is provided with a stirrer and an internal cooling jacket.

7. A solvent purification and freeze crystallization desalination plant as claimed in claim 1 wherein: the centrifuge (7) is made of S316 materials and is internally provided with a spray washing water spray head.