CN211585994U - Industrial flue gas sodium method dust removal desulfurization zero release transformation system - Google Patents
Industrial flue gas sodium method dust removal desulfurization zero release transformation system Download PDFInfo
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- CN211585994U CN211585994U CN201922426216.5U CN201922426216U CN211585994U CN 211585994 U CN211585994 U CN 211585994U CN 201922426216 U CN201922426216 U CN 201922426216U CN 211585994 U CN211585994 U CN 211585994U
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Abstract
The utility model discloses an industrial flue gas sodium method dust removal desulfurization zero release transformation system. Comprises a dust remover (1), a desulfurizing tower (3) and a sodium sulfate recovery system; the dust remover (1) is connected with the desulfurizing tower (3) through a booster fan (2); the desulfurizing tower (3) comprises a spraying layer (4), a demister (5), a chimney (6), a circulating pump (7) and a slurry discharge pump (8); the sodium sulfate recovery system comprises a neutralization oxidation tank (9), a concentration module (10), a cooling crystallizer (11), a thickener (12), a solid-liquid separation module (13) and a melting crystallizer (14), which are connected in sequence through pipelines. The process adopts high-efficiency dust removal and wet desulphurization, has high dust removal and desulphurization efficiency, and can meet the latest environmental protection requirement; the produced sodium sulfate product has high purity, certain economic benefit and reduced operation cost.
Description
Technical Field
The utility model belongs to the technical field of industrial flue gas pollution prevention and cure, concretely relates to industrial flue gas sodium method dust removal desulfurization zero release transformation system.
Background
Sulfur dioxide is one of the main industrial pollutants, and the emission amount of the sulfur dioxide is an important index for judging whether the atmosphere is polluted or not. Industrial flue gas such as industrial furnace flue gas, thermal power boiler flue gas, metal smelting flue gas, chemical oil refining flue gas and the like are main emission sources of sulfur dioxide in the atmosphere. Under the strong governance of the state, almost all the industrial flue gas discharge devices are matched with desulfurization and dust removal devices at present. The sodium-alkali method is used as a desulfurization process with high absorption efficiency and easily obtained absorbent, and has very wide application in industrial flue gas desulfurization of various industries, especially in the petrochemical industry.
In recent years, the country strongly advocates environmental protection treatment to achieve zero emission, while traditional sodium-method dust removal and desulfurization processes, such as EDV wet desulfurization process of Belco corporation and WGS wet scrubbing process of Exxon corporation, have high solid content in desulfurization slurry and high difficulty in treating high-salinity wastewater, and cannot meet the requirement of zero emission advocated in recent years. For the above reasons, in recent years, more and more research and development have been focused on a desulfurization dust removal process that is stable in operation, does not cause new environmental problems, can recover desulfurization byproducts, and does not generate secondary pollution. For this reason, there have been proposed an ammonia desulfurization process for recovering an ammonium sulfate by-product, a sodium sulfite recovery process for recovering sodium sulfite, and a sodium metabisulfite recovery process for recovering a sodium metabisulfite product, and the following techniques and patent documents have been mainly disclosed.
Chinese patent publication No. CN200710078250 discloses an energy-saving sodium sulfite circulating desulfurization device and method. With Na2CO3A three-loop tower is arranged for absorbing the SO in the flue gas2Absorption is carried out, and the temperature and the pH value in the three-stage loop are controlled, so that the sulfur in the slurry exists in the form of sodium bisulfite. The generated sodium bisulfite solution exchanges heat with the raw flue gas at the inlet to decompose the sodium bisulfite to generate SO2With Na2SO3。SO2Can be recovered and liquefied as chemical raw material, Na2SO3Can be returned to the tower for reuse. The process adopts the three-loop tower, and the reconstruction of the established environmental protection device into the three-loop tower is difficult because the foundation and the height of the desulfurizing tower are fixed, and only the disassembly and the reconstruction are needed, so the cost is greatly increased.
Chinese patent publication No. CN103961995A discloses a method for producing high-purity sodium sulfite and sodium sulfate by coal-fired flue gas alkaline desulfurization, wherein the process comprises two-stage desulfurization process, wherein sodium sulfate is generated in the first stage, oxygen in flue gas is consumed, and a small part of SO is absorbed2The oxidation of the sodium sulfite product in the second section is avoided; the second stage absorbs the residual SO2Sodium sulfite by-product is produced. Due to the different properties of sodium sulfate and sodium sulfite, the process needs two sets of post-treatment systems, so that the investment and operation cost are increased, the post-treatment systems are complex, the number of fault points is large, and the operation cost is increased to a certain extent.
Disclosure of Invention
The traditional technology that exists to present industry flue gas sodium method desulfurization dust removal technology can't satisfy the zero release requirement that the country advocated, and new process systems is complicated, has built a series of problems such as the difficult transformation of device, the utility model provides an industry flue gas sodium method dust removal desulfurization zero release transformation system, this system has built the device change less to traditional sodium method technology, can satisfy the zero release requirement that the country advocated simultaneously, accords with green recycling economy, reforms transform the low investment, and environmental protection benefit, economic benefits are showing.
In order to realize the purpose of the utility model, one aspect of the utility model provides an industrial flue gas sodium method dedusting and desulfurizing zero-emission reconstruction system, which comprises a deduster, a desulfurizing tower and a sodium sulfate recovery system; the dust remover is connected with the desulfurizing tower through a booster fan; the desulfurizing tower comprises a spraying layer, a demister, a chimney, a circulating pump and a slurry discharge pump; the sodium sulfate recovery system comprises a neutralization oxidation tank, a concentration module, a cooling crystallizer, a thickener, a solid-liquid separation module and a melting crystallizer which are connected in sequence through pipelines;
the slurry discharge pump is connected with the neutralization oxidation tank;
the neutralization oxidation tank is used for adding NaOH solution for neutralization, so that part of NaHSO in the slurry is neutralized4The neutralization is Na2SO4Simultaneously introducing oxidizing air to fully oxidize the slurry and ensure that part of Na in the slurry is2SO3Oxidized to Na2SO4；
The concentration module is used for concentrating the slurry from 8-15% to 35-45%, the concentrated phase is conveyed into the cooling crystallizer, and the dilute phase returns to the desulfurizing tower for recycling;
the cooling crystallizer is used for exchanging heat between the slurry and a cooling medium, and cooling to separate out sodium sulfate crystals;
the thickener is used for the solid-liquid pre-separation process; the solid phase obtained by pre-separation enters a solid-liquid separation module for solid-liquid phase separation, the separated liquid phase returns to the desulfurizing tower for recycling, and the separated solid phase enters a melting crystallizer;
the melt crystallizer is used for melt dehydration, and removing free water of products and bound water carried by crystals.
According to the embodiment of the utility model, the dust remover is bag collector, electrostatic precipitator, electric bag composite dust remover.
According to the utility model discloses the embodiment, concentrated module is membrane separation system, reverse osmosis system or decompression evaporation system.
According to the embodiment of the utility model provides a, solid-liquid separation module is centrifuge, plate and frame filter press.
The utility model discloses a another aspect provides an industry flue gas sodium method dust removal desulfurization zero release transformation method, including following step:
s1: the industrial flue gas firstly enters a dust remover, and enters a desulfurizing tower after dust in the flue gas is removed;
s2: the flue gas after dust removal enters the desulfurizing tower through the booster fan and is reversely connected with absorption slurry atomized into liquid drops through the absorption spray layerThe SO in the flue gas is removed by contact2Then demisting by a demister and discharging by a chimney;
s3: the absorption slurry is stored at the bottom of the desulfurizing tower and is conveyed to the absorbing spray layer of the desulfurizing tower through the circulating pump to absorb SO in the flue gas2After the absorption slurry reaches a certain density, conveying the absorption slurry to a neutralization oxidation tank in a sodium sulfate recovery system through a slurry discharge pump;
s4 NaOH solution is added into a neutralization oxidation tank for neutralization, so that part of NaHSO in slurry is neutralized4The neutralization is Na2SO4Simultaneously introducing oxidizing air to fully oxidize the slurry and ensure that part of Na in the slurry is2SO3Oxidized to Na2SO4；
S5: introducing the neutralized and oxidized slurry into a concentration module, concentrating the slurry from 8-15% to 35-45% in the concentration module, conveying a concentrated phase into a cooling crystallizer, and returning a dilute phase to the desulfurizing tower 3 for recycling;
s6: and cooling the slurry in a cooling crystallizer through heat exchange with a cooling medium to separate out sodium sulfate crystals. After reaching the crystallization temperature and precipitating a certain amount of crystals, conveying the crystals to a thickener for solid-liquid pre-separation;
s7: and (3) the solid phase pre-separated in the thickener enters a solid-liquid separation module for solid-liquid phase separation, the separated liquid phase returns to a desulfurizing tower for recycling, the separated solid phase enters a melting crystallizer for melting and dehydration, the bound water carried by the crystal is removed while the free water of the product is removed, and the industrial anhydrous sodium sulfate product is prepared and then packaged for sale.
According to the embodiment of the utility model, step S3, absorption section thick liquid temperature control is between 50~60 ℃, and sodium sulfate solubility is the highest under this temperature.
According to the embodiment of the present invention, in step S3, the desulfurizing agent in the desulfurizing tower is NaOH or Na2CO3Pumping the solution into the slurry at the bottom of the desulfurization tower by a pump, controlling the pH value of the slurry at the absorption section to be 5.5-6.5, and ensuring SO2Is completely absorbed to reach the discharge standard, and simultaneously ensures that the main component in the slurry is Na2SO3And NaHSO3And (3) mixing.
According to the embodiment of the present invention, in step S4, the neutralization oxidation tank 9 is fully stirred and a certain amount of oxidant is added if necessary, so as to add Na in the slurry2SO3All are oxidized to ensure the purity of the product.
According to the embodiment of the utility model, step S6 is realized mainly through the very big principle of the solubility of sodium sulfate in aqueous along with temperature variation trend. And reducing the temperature of the slurry to 5-10 ℃, usually 5 ℃, in a cooling crystallizer to reduce the solubility of sodium sulfate by more than 80 percent, thereby separating out a large amount of high-purity sodium sulfate crystals.
Adopt the technical scheme of the utility model, the dust concentration is less than 10mg/Nm in the dust remover export flue gas3The solid content of the lower thick slurry of the thickener is more than 30 percent; the water content of the dehydrated sodium sulfate is about 3-10%, generally 5%.
The utility model has the advantages that: (1) the process adopts high-efficiency dust removal and wet desulphurization, has high dust removal and desulphurization efficiency, and can meet the latest environmental protection requirement; (2) the dust content entering the desulfurization system is controlled to be 10mg/Nm through dust removal before desulfurization3The dust content in the sodium sulfate recovery suspension is greatly reduced, and the purity of the sodium sulfate is effectively improved; (3) the process has little change to the main body of the traditional sodium desulphurization process device, is very suitable for reconstruction projects, and meets the national requirement of zero emission on the premise of reducing investment; (4) zero discharge of waste water is realized, the process is simple, and the operation cost is low; (5) the cooling crystallization process is adopted to replace the common evaporative crystallization process, so that the energy is saved, and the operation cost is reduced; (6) the produced sodium sulfate product has high purity, certain economic benefit and reduced operation cost.
Drawings
FIG. 1 is a flow chart of a system for dedusting, desulfurizing and recovering sodium sulfate from industrial flue gas.
In the figure: 1-a dust remover; 2-a booster fan; 3-a desulfurizing tower; 4-spraying layer; 5, a demister; 6, a chimney; 7-circulating pump; 8-slurry discharge pump; 9-neutralization oxidation pot; 10-a concentration module; 11-cooling the crystallizer; 12-thickener; 13-solid-liquid separation module; 14-melt crystallizer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
A zero-emission reconstruction system for industrial flue gas dust removal and desulfurization by a sodium method comprises a dust remover 1, a desulfurizing tower 3 and a sodium sulfate recovery system; the dust remover 1 is connected with a desulfurizing tower 3 through a booster fan 2; the desulfurizing tower 3 comprises a spraying layer 4, a demister 5, a chimney 6, a circulating pump 7 and a slurry discharge pump 8; the sodium sulfate recovery system comprises a neutralization oxidation tank 9, a concentration module 10, a cooling crystallizer 11, a thickener 12, a solid-liquid separation module 13 and a melt crystallizer 14 which are connected in sequence through pipelines;
the slurry discharge pump 8 is connected with a neutralization oxidation tank 9;
the neutralization oxidation tank 9 is used for adding NaOH solution for neutralization, so that part of NaHSO in the slurry is neutralized4The neutralization is Na2SO4Simultaneously introducing oxidizing air to fully oxidize the slurry and ensure that part of Na in the slurry is2SO3Oxidized to Na2SO4；
The concentration module 10 is used for concentrating the slurry concentration from 8-15% to 35-45%, conveying a concentrated phase into the cooling crystallizer 11, and returning a dilute phase to the desulfurizing tower 3 for recycling;
the cooling crystallizer 11 is used for exchanging heat between the slurry and a cooling medium, and cooling to separate out sodium sulfate crystals;
the thickener 12 is used for the solid-liquid pre-separation process; the solid phase separated in advance enters a solid-liquid separation module 13 for solid-liquid phase separation, the separated liquid phase returns to the desulfurizing tower 3 for recycling, and the separated solid phase enters a melting crystallizer 14;
the melt crystallizer 14 is used for melt dehydration, and removing free water of products and bound water carried by crystals.
The dust remover 1 is a bag type dust remover, an electric dust remover and an electric bag composite dust remover.
The concentration module 10 is a membrane separation system, a reverse osmosis system or a reduced pressure evaporation system.
The solid-liquid separation module 13 is a centrifuge or a plate-and-frame filter press.
A sodium method dedusting and desulfurization zero-emission reconstruction method for industrial flue gas comprises the following steps:
s1: the industrial flue gas firstly enters a dust remover 1, and enters a desulfurizing tower 3 after dust in the flue gas is removed;
s2: the flue gas after dust removal enters a desulfurizing tower 3 through a booster fan 2 and reversely contacts with absorption slurry atomized into liquid drops through an absorption spraying layer 4 to remove SO in the flue gas2Then demisting by a demister 5 and discharging by a chimney 6;
s3: the absorption slurry is stored at the bottom of the desulfurizing tower 3 and is conveyed to the desulfurizing tower 3 to absorb the spraying layer 4 through the circulating pump 7 to absorb SO in the flue gas2After the absorption slurry reaches a certain density, the absorption slurry is conveyed to a neutralization oxidation tank 9 in a sodium sulfate recovery system through a slurry discharge pump 8;
s4 NaOH solution is added into a neutralization oxidation tank 9 for neutralization, so that part of NaHSO in slurry is neutralized4The neutralization is Na2SO4Simultaneously introducing oxidizing air to fully oxidize the slurry and ensure that part of Na in the slurry is2SO3Oxidized to Na2SO4；
S5: introducing the neutralized and oxidized slurry into a concentration module 10, concentrating the slurry from 8-15% to 35-45% in the concentration module, conveying a concentrated phase into a cooling crystallizer 11, and returning a dilute phase to the desulfurizing tower 3 for recycling;
s6: the slurry is cooled in a cooling crystallizer 11 through heat exchange with a cooling medium to separate out sodium sulfate crystals. After reaching the crystallization temperature and precipitating a certain amount of crystals, conveying the crystals to the thickener 12 for solid-liquid pre-separation;
s7: the solid phase pre-separated in the thickener 12 enters a solid-liquid separation module 13 for solid-liquid phase separation, the separated liquid phase returns to the desulfurizing tower 3 for recycling, the separated solid phase enters a melting crystallizer 14 for melting and dehydration, the bonding water carried by the crystal is removed while the free water of the product is removed, the industrial anhydrous sodium sulfate product is prepared, and then the finished product is packaged and sold.
In the step S3, the temperature of the slurry in the absorption section is controlled to be 50-60 ℃, and the solubility of sodium sulfate is highest at the temperature.
In the step S3, the desulfurizing agent in the desulfurizing tower 3 is NaOH or Na2CO3Pumping the solution into the slurry at the bottom of the desulfurizing tower 3 by a pump, controlling the pH value of the slurry at the absorption section to be 5.5-6.5, and ensuring SO2Is completely absorbed to reach the discharge standard, and simultaneously ensures that the main component in the slurry is Na2SO3And NaHSO3And (3) mixing.
In the step S4, the neutralization oxidation tank 9 needs to be fully stirred, and if necessary, a certain amount of oxidant is added to make Na in the slurry2SO3All are oxidized to ensure the purity of the product.
The step S6 is mainly realized by the principle that the solubility of sodium sulfate in water has a great trend along with temperature change. And reducing the temperature of the slurry to 5-10 ℃, usually 5 ℃, in a cooling crystallizer to reduce the solubility of sodium sulfate by more than 80 percent, thereby separating out a large amount of high-purity sodium sulfate crystals.
The utility model relates to a system, when satisfying the new standard of current environmental protection, high to the rate of recovery of sodium sulfate, gained product purity is high, and economic benefits is showing, and nearly no wastewater discharge simultaneously, simple process has characteristics such as running cost is low, and economic and environmental benefit are obvious. Compared with the traditional process, the process has less modification on main devices such as a desulfurizing tower and the like, is suitable for the modification of various established Na-method desulfurizing systems, and conforms to the national wastewater zero discharge requirement.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The industrial flue gas sodium method dedusting and desulfurizing zero-emission reconstruction system is characterized by comprising a deduster (1), a desulfurizing tower (3) and a sodium sulfate recovery system; the dust remover (1) is connected with the desulfurizing tower (3) through a booster fan (2); the desulfurizing tower (3) comprises a spraying layer (4), a demister (5), a chimney (6), a circulating pump (7) and a slurry discharge pump (8); the sodium sulfate recovery system comprises a neutralization oxidation tank (9), a concentration module (10), a cooling crystallizer (11), a thickener (12), a solid-liquid separation module (13) and a melting crystallizer (14), which are connected in sequence through pipelines;
the slurry discharge pump (8) is connected with a neutralization oxidation tank (9);
the neutralization oxidation tank (9) is used for adding NaOH solution for neutralization, so that part of NaHSO in the slurry is neutralized4The neutralization is Na2SO4Simultaneously introducing oxidizing air to fully oxidize the slurry and ensure that part of Na in the slurry is2SO3Oxidized to Na2SO4；
The concentration module (10) is used for concentrating the slurry concentration from 8-15% to 35-45%, conveying a concentrated phase into the cooling crystallizer, and returning a dilute phase to the desulfurizing tower (3) for recycling;
the cooling crystallizer (11) is used for heat exchange between the slurry and a cooling medium, and cooling to separate out sodium sulfate crystals;
the thickener (12) is used for the solid-liquid pre-separation process; the solid phase pre-separated enters a solid-liquid separation module (13) for solid-liquid phase separation, the separated liquid phase returns to the desulfurizing tower (3) for recycling, and the separated solid phase enters a melting crystallizer (14);
the melt crystallizer (14) is used for melt dehydration, and removing free water of products and bound water carried by crystals.
2. The industrial flue gas sodium method dedusting and desulfurizing zero-emission reconstruction system according to claim 1, characterized in that the dust collector (1) is a bag type dust collector, an electric dust collector, or an electric bag composite dust collector.
3. The industrial flue gas sodium dust removal desulfurization zero-emission modification system of claim 1, characterized in that the concentration module (10) is a membrane separation system, a reverse osmosis system or a reduced pressure evaporation system.
4. The system of claim 1, wherein the solid-liquid separation module (13) is a centrifuge or a plate-and-frame filter press.
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| CN111013363A (en) * | 2019-12-30 | 2020-04-17 | 中钢集团天澄环保科技股份有限公司 | Industrial flue gas sodium method dedusting and desulfurization zero-emission reconstruction system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111013363A (en) * | 2019-12-30 | 2020-04-17 | 中钢集团天澄环保科技股份有限公司 | Industrial flue gas sodium method dedusting and desulfurization zero-emission reconstruction system and method |
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