CN114618274B - Method for preventing corrosion of metal heat exchanger - Google Patents
Method for preventing corrosion of metal heat exchanger Download PDFInfo
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- CN114618274B CN114618274B CN202210155755.3A CN202210155755A CN114618274B CN 114618274 B CN114618274 B CN 114618274B CN 202210155755 A CN202210155755 A CN 202210155755A CN 114618274 B CN114618274 B CN 114618274B
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- flue gas
- desulfurization
- heat exchanger
- metal
- denitration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention provides a method for preventing corrosion of a metal heat exchanger, which comprises the following steps: step A: the raw flue gas is changed into desulfurization saturated clean flue gas at 50 ℃ after passing through a desulfurization tower, then is heated after passing through a desulfurization metal flue gas heat exchanger, and then enters a denitration system to form high-temperature flue gas after denitration and is discharged from the denitration system; and (B) step (B): and (3) taking a part of denitrated high-temperature flue gas discharged from the denitration system, and then guiding the part of denitrated high-temperature flue gas back to a clean flue gas side inlet of the desulfurization metal flue gas heat exchanger to mix with saturated clean flue gas at an outlet of the desulfurization tower, so that the saturated clean flue gas at the outlet of the desulfurization tower is heated by 2-5 ℃, and condensation moisture and acid mist are prevented from forming when the desulfurization saturated clean flue gas passes through the desulfurization metal flue gas heat exchanger. The invention overcomes the essential problem that the desulfurization metal heat exchanger is corroded, reduces the material requirement of the metal heat exchanger, and reduces the investment and maintenance cost.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to protection of a desulfurization metal flue gas heat exchanger, and especially relates to a method for preventing corrosion of a metal heat exchanger.
Background
At present, a desulfurization and denitrification system with a desulfurization metal flue gas heat exchanger is combined with a wet desulfurization and SCR denitrification process at home, and most of the desulfurization and denitrification processes are adopted. The original flue gas is changed into saturated clean flue gas temperature of about 50 ℃ after passing through a desulfurization system, then the temperature can be raised by 20-30 ℃ after passing through a configured desulfurization metal flue gas heat exchanger, the flue gas enters a denitration system, the flue gas is finally lifted to the temperature of 200-320 ℃ in a denitration reaction window by a rotary flue gas heat exchanger and the temperature of the flue gas after denitration is reduced to about 110 ℃ after passing through the rotary flue gas heat exchanger, and then the flue gas is discharged.
The wet desulfurization outlet flue gas is mostly water-containing saturated flue gas at about 50 ℃, and more wet desulfurization heat exchangers are configured for heat exchange of flue gas before and after desulfurization in order to strengthen the flue gas discharging effect, so that the flue gas temperature of a desulfurization inlet can be reduced, the flue gas temperature of the desulfurization outlet is improved, the effects of reducing the desulfurization evaporation capacity and improving the diffusion capacity of the flue gas of the desulfurization outlet are achieved, and a considerable part of heat exchangers adopt a water-borne metal flue gas heat exchanger (MGGH) or a metal tube type plate heat exchanger (GGH). However, due to the characteristics of wet desulfurization, when a metal heat exchanger is used, the problems of acid mist corrosion are faced, and the problems are specifically as follows:
first, more severe acid corrosion. The sintering flue gas contains a large amount of sulfur dioxide, when the unded sulfur dioxide is combined with oxygen under a certain condition to generate sulfur trioxide, the sulfur trioxide is combined with water vapor to form sulfuric acid droplets, meanwhile, the clean flue gas carries sulfite and sulfate slurry droplets which escape from a desulfurizing tower, the existence of the sulfate, the sulfite and the sulfate droplets obviously increases the acid dew point of the flue gas, in addition, before the flue gas is cooled from a desulfurization outlet to a clean flue gas side inlet of a desulfurization metal flue gas heat exchanger, a certain flue distance exists, a small amount of water droplets are separated from the saturated clean flue gas, the saturated clean flue gas enters the heating side of the metal heat exchanger along with the clean flue gas and the carrying matters thereof, and meanwhile, the flue gas is atomized under the condition that the flue gas temperature is lower than the acid dew point, so that corrosion is caused to metal heat exchanger elements on the clean flue gas side, and metal walls and heat exchange plates of the metal heat exchanger are thinned and damaged.
Second, economy of material selection. In terms of the current material cost and process, the problems can be solved to a certain extent by improving the material, but the high price and maintenance cost are required to be born, and the improvement of the material only slows down the corrosion rate and fails to fundamentally solve the problem that the material is corroded.
In summary, the following problems exist in the prior art: after desulfurization, the clean flue gas corrodes the metal heat exchanger, especially the clean flue gas side.
Disclosure of Invention
The invention provides a method for preventing corrosion of a metal heat exchanger, which aims to solve the problem of corrosion of clean flue gas to the metal heat exchanger.
To this end, the present invention proposes a method of preventing corrosion of a metal heat exchanger, the method of preventing corrosion of a metal heat exchanger comprising:
step A: the raw flue gas is changed into desulfurization saturated clean flue gas at 50 ℃ after passing through a desulfurization tower, then is heated after passing through a desulfurization metal flue gas heat exchanger, and then enters a denitration system to form high-temperature flue gas after denitration and is discharged from the denitration system;
and (B) step (B): and (3) taking a part of denitrated high-temperature flue gas discharged from the denitration system, and then guiding the part of denitrated high-temperature flue gas back to a clean flue gas side inlet of the desulfurization metal flue gas heat exchanger to mix with saturated clean flue gas at an outlet of the desulfurization tower, so that the saturated clean flue gas at the outlet of the desulfurization tower is heated by 2-5 ℃, and condensation moisture and acid mist are prevented from being formed when the desulfurization saturated clean flue gas passes through the desulfurization metal flue gas heat exchanger.
Further, the desulfurizing tower is a desulfurizing tower of a wet desulfurizing system.
Further, in the step B, the amount of a part of high-temperature flue gas discharged from the denitration system is as follows: taking 1/14-1/9 of the total standard amount of the saturated clean flue gas at the outlet of the desulfurizing tower.
Further, the high-temperature flue gas after denitration is about 110 ℃.
In the step B, a branch flue is arranged on an outlet flue of the booster fan in the denitration system, and the high-temperature flue gas after denitration is led back to a clean flue gas side inlet of the desulfurization metal flue gas heat exchanger through the branch flue.
In the step B, a booster fan and a chimney are arranged behind the denitration system, a regenerative fan is arranged between the booster fan and the chimney, and the high-temperature flue gas after denitration is guided back to a clean flue gas side inlet of the desulfurization metal flue gas heat exchanger through the regenerative fan.
Further, a wind mixing device is arranged at the inlet of the clean flue gas side of the desulfurization metal flue gas heat exchanger, and high-temperature flue gas after denitration and saturated clean flue gas at the outlet of the desulfurization tower are mixed by the wind mixing device.
The denitration system is an SCR denitration system.
According to the invention, the high-temperature flue gas (about 110 ℃) after denitration is led to the clean flue gas inlet side of the desulfurization metal heat exchanger, so that the temperature of saturated clean flue gas from the outlet of the wet desulfurization tower is increased by 2-5 ℃, the problem that the saturated clean flue gas from the outlet of the desulfurization tower is easy to separate out water at the clean flue gas inlet side of the desulfurization metal heat exchanger and is condensed to form acid mist to cause corrosion to the metal heat exchanger is solved, the essential problem that the desulfurization metal heat exchanger is corroded is overcome, the material requirement of the metal heat exchanger is reduced, the investment and maintenance cost are reduced, and the method has important practical significance for realizing energy conservation, emission reduction and environmental protection development strategy.
Drawings
FIG. 1 is a schematic diagram of the working principle of an embodiment of the present invention;
fig. 2 is a schematic diagram of a front view structure of an air mixing device at a clean flue gas side inlet of a desulfurization metal flue gas heat exchanger.
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a schematic diagram of a specific workflow of one embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, the present invention will be described with reference to the accompanying drawings.
Applicants found in the study that: the clean flue gas after wet desulfurization carries part of slurry liquid drops containing sulfite and sulfate which escape from the absorption tower, and meanwhile, the clean flue gas is saturated flue gas with higher dew point temperature and higher water content, when passing through the heating side of the desulfurization metal heat exchanger, acid mist is easy to form, and the carried slurry liquid and a small amount of precipitated water drops can also cover the surface of the heat exchange element to cause corrosion to the heat exchanger. In addition, the precipitated moisture is combined with part of the undetached sintering dust, which also causes scaling, so that the heat exchanger is locally overheated, thereby reducing the working efficiency.
Therefore, as shown in fig. 1 and 4, the applicant applies to a desulfurization and denitrification system which combines a wet desulfurization and SCR denitrification process and is provided with a desulfurization metal flue gas heat exchanger, such as sintering, pelletizing, a boiler and the like, and the high-temperature clean flue gas (about 110 ℃) after partial denitrification is led to the clean flue gas inlet side of the desulfurization metal heat exchanger by arranging a regenerative fan and a pipeline, and the saturated clean flue gas from the desulfurization tower is subjected to mixed air heating to 2-5 ℃ by an air mixing device, so that the flue gas temperature is higher than the dew point temperature and becomes unsaturated flue gas, acid mist is prevented from being condensed when the flue gas passes through a rear-end flue and the heat exchanger, and corrosion to the heat exchanger is prevented from being caused in principle from the property of the flue gas, thereby realizing the protection of the desulfurization metal flue gas heat exchanger.
Further, as shown in fig. 3 and 4, the air mixing device includes a plurality of nozzles 220 extending into the desulfurization metal flue gas heat exchanger 20. The caliber of the nozzle 220 is smaller than that of the desulfurization metal flue gas heat exchanger 20, and the nozzle 220 can provide a higher outlet speed, so that the full mixing is facilitated.
Further, the nozzles 220 are uniformly arranged in the radial direction of the inlet of the clean flue gas side of the desulfurization metal flue gas heat exchanger, and the axis of the nozzles 20 is perpendicular to the pipeline of the inlet of the clean flue gas side of the desulfurization metal flue gas heat exchanger. Thus, the air mixing effect is uniform.
The applicant opens a branch flue on the outlet flue of a booster fan in a desulfurization and denitrification system which combines wet desulfurization and SCR denitrification processes and is provided with a desulfurization metal flue gas heat exchanger, and is provided with a regenerative fan, and the regenerative fan is used for taking high-temperature flue gas of about 110 ℃ after denitrification of 1/14-1/9 of the standard total amount of saturated clean flue gas at the outlet of the desulfurization tower, and the high-temperature flue gas is conveyed to a wind mixing device at the clean flue gas side inlet of the desulfurization metal flue gas heat exchanger through the flue, so that the effect of heating the saturated clean flue gas at the outlet of the desulfurization tower by 2-5 ℃ is realized. By the device, condensation water and acid mist are prevented from forming when the desulfurization saturated clean flue gas passes through the desulfurization metal flue gas heat exchanger, so that the desulfurization metal flue gas heat exchanger is protected. By contrast, the desulfurization metal heat exchanger protected by the invention has the advantages that the surface is not directly washed by slurry carried by desulfurization clean flue gas to cause corrosion, the surface scaling phenomenon is avoided, the service life of the heat exchanger is prolonged, the heat exchange efficiency is prevented from being reduced, the service life of the desulfurization metal heat exchanger is prolonged by 3-5 years, and the heat exchange efficiency of the heat exchanger is reduced by not more than 1% in one maintenance period (3 months) and is far lower than the value that the heat exchange efficiency of the desulfurization heat exchanger which is not protected by the invention is normally reduced by 5-8% in one maintenance period.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. In order that the components of the invention may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the invention.
Claims (5)
1. A method of preventing corrosion of a metal heat exchanger, the method comprising:
step A: the raw flue gas is changed into desulfurization saturated clean flue gas at 50 ℃ after passing through a desulfurization tower, then is heated after passing through a desulfurization metal flue gas heat exchanger, and then enters a denitration system to form high-temperature flue gas after denitration and is discharged from the denitration system;
and (B) step (B): a part of the denitrated high-temperature flue gas discharged from the denitration system is led back to the inlet of the clean flue gas side of the desulfurization metal flue gas heat exchanger and the saturated clean flue gas at the outlet of the desulfurization tower for mixing, so that the saturated clean flue gas at the outlet of the desulfurization tower is heated to 2-5 ℃, and condensation moisture and acid mist are prevented from being formed when the desulfurization saturated clean flue gas passes through the desulfurization metal flue gas heat exchanger;
the high-temperature flue gas after denitration is 110 ℃;
in the step B, the amount of a part of high-temperature flue gas discharged from the denitration system is as follows: taking 1/14-1/9 of the total standard condition of the saturated clean flue gas at the outlet of the desulfurizing tower, namely the high-temperature flue gas after denitration;
a branch flue is opened on an outlet flue of a booster fan in a desulfurization and denitrification system which combines wet desulfurization and SCR denitrification processes and is provided with a desulfurization metal flue gas heat exchanger, a regenerative fan is configured, high-temperature flue gas at about 110 ℃ after denitrification is carried out by taking 1/14-1/9 of the standard total amount of saturated clean flue gas at an outlet of a desulfurization tower through the regenerative fan, and the high-temperature flue gas is conveyed to a wind mixing device at a clean flue gas side inlet of the desulfurization metal flue gas heat exchanger through the flue, so that the effect of heating the saturated clean flue gas at the outlet of the desulfurization tower by 2-5 ℃ is realized;
the service life of the desulfurization metal heat exchanger is prolonged by 3-5 years, and the heat exchange efficiency of the heat exchanger is reduced by not more than 1% in one overhaul period.
2. The method for preventing corrosion of a metal heat exchanger according to claim 1, wherein the desulfurizing tower is a desulfurizing tower of a wet desulfurizing system.
3. The method for preventing corrosion of a metal heat exchanger according to claim 1, wherein in the step B, a bypass flue is opened on an outlet flue of a booster fan in the denitration system, and the high-temperature flue gas after denitration is led back to a clean flue gas side inlet of the desulfurization metal flue gas heat exchanger through the bypass flue.
4. A method of preventing corrosion of a metal heat exchanger as claimed in claim 3, wherein in step B, a booster fan and a chimney are provided after the denitration system, and a regenerative fan is provided between the booster fan and the chimney, and the high temperature flue gas after denitration is reintroduced back to the clean flue gas side inlet of the desulfurization metal flue gas heat exchanger by the regenerative fan.
5. A method for preventing corrosion of a metal heat exchanger according to claim 3, wherein a wind mixing device is arranged at the inlet of the clean flue gas side of the desulfurization metal flue gas heat exchanger, and the high-temperature flue gas after denitration and the saturated clean flue gas at the outlet of the desulfurization tower are mixed by the wind mixing device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210155755.3A CN114618274B (en) | 2022-02-21 | 2022-02-21 | Method for preventing corrosion of metal heat exchanger |
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| CN202210155755.3A CN114618274B (en) | 2022-02-21 | 2022-02-21 | Method for preventing corrosion of metal heat exchanger |
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| CN114618274B true CN114618274B (en) | 2023-04-21 |
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