CN211216182U - Sodium bicarbonate dry flue gas desulfurization system - Google Patents

Sodium bicarbonate dry flue gas desulfurization system Download PDF

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CN211216182U
CN211216182U CN201922120438.4U CN201922120438U CN211216182U CN 211216182 U CN211216182 U CN 211216182U CN 201922120438 U CN201922120438 U CN 201922120438U CN 211216182 U CN211216182 U CN 211216182U
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flue gas
sodium bicarbonate
desulfurization
reactor
recovery device
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王正艳
何永胜
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Shanghai Gem Environmental Technology Engineering Co ltd
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Shanghai Gem Environmental Technology Engineering Co ltd
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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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
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    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals

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Abstract

The application discloses a sodium bicarbonate dry flue gas desulfurization system, which comprises a desulfurizer supply device, a desulfurization reactor, a bag-type dust collector, a flue gas waste heat recovery device, a particulate matter recovery device and a high-salt water evaporation crystallization device; the desulfurizing agent supply device is connected with the desulfurizing reactor, a sodium bicarbonate preheating pipe section is arranged in the desulfurizing reactor, the bag-type dust remover is connected with the desulfurizing reactor, the flue gas waste heat recovery device is connected with the bag-type dust remover, the particulate matter recovery device is connected with the bag-type dust remover, and the high-salt water evaporation crystallization device is connected with the particulate matter recovery device. The method realizes the recycling of the sodium salt of the desulfurization product, does not produce secondary pollution, improves the desulfurization efficiency by additionally arranging the sodium bicarbonate preheating pipe section, the adsorbent bed layer and other measures in the reactor, and has good popularization and application values.

Description

Sodium bicarbonate dry flue gas desulfurization system
Technical Field
The application belongs to the technical field of flue gas desulfurization, and particularly relates to a sodium bicarbonate dry flue gas desulfurization system.
Background
Sodium bicarbonate (NaHCO)3) The active sodium bicarbonate powder is also called as baking soda, can be quickly pyrolyzed and converted into sodium carbonate after being contacted with hot flue gas, can greatly improve the porosity and the specific surface area of sodium-based particles, promotes the contact of a desulfurizing agent and acidic substances in the flue gas, and further improves SO in the flue gas2、SO3And the removal rate of acidic substances such as HCl and HF. The sodium bicarbonate dry desulphurization has the advantages of no corrosion to a system, no condensation, no wastewater generation and the like, has the existing case of industrial implementation, still has the defects of low desulphurization efficiency, difficult treatment of desulphurization products and the like, and is difficult to widely popularize. Therefore, the sodium bicarbonate dry flue gas desulfurization system which is economical and efficient and can recycle the desulfurization product is developed, and the application prospect is wide.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the technical problem to be solved by the application is to provide a sodium bicarbonate dry flue gas desulfurization system.
In order to solve the technical problem, the application is realized by the following technical scheme:
a sodium bicarbonate dry flue gas desulfurization system is characterized by comprising a desulfurizer supply device, a desulfurization reactor, a bag-type dust collector, a flue gas waste heat recovery device, a particulate matter recovery device and a high-salt water evaporation crystallization device; the desulfurizer supply device is connected with the desulfurization reactor and is used for evaporating, crystallizing and separating to obtain solid sodium sulfate and solid sodium chloride in the high-salinity water; a sodium bicarbonate preheating pipe section is arranged in the desulfurization reactor and is used for heating desulfurizer sodium bicarbonate to remove acidic substances in the flue gas; the bag-type dust collector is connected with the desulfurization reactor and is used for collecting fly ash and desulfurization products in flue gas; the flue gas waste heat recovery device is connected with the bag-type dust collector and is used for recovering heat in flue gas; the particle recovery device is connected with the bag-type dust collector and is used for collecting and separating fly ash and desulfurization products; and the high-salinity water evaporation crystallization device is connected with the particulate matter recovery device and is used for evaporating, crystallizing and separating to obtain solid sodium sulfate and solid sodium chloride in the high-salinity water.
Further, in the sodium bicarbonate dry flue gas desulfurization system, the desulfurization reactor is a fixed bed reactor and comprises a flue gas inlet, a flue gas outlet and at least one adsorbent bed layer arranged inside the reactor.
Further, in the above sodium bicarbonate dry flue gas desulfurization system, the adsorbent used in the adsorbent bed is activated carbon.
Further, in the above system for flue gas desulfurization by sodium bicarbonate dry process, the high-salt water evaporative crystallization device comprises a primary evaporator, a freezing crystallizer, a sodium sulfate evaporative crystallizer and a sodium chloride evaporative crystallizer.
Further, in the sodium bicarbonate dry flue gas desulfurization system, steam inlets of the primary evaporator, the sodium sulfate evaporative crystallizer and the sodium chloride evaporative crystallizer of the high-salt water evaporative crystallization device are connected with a steam outlet of the flue gas waste heat recovery device.
Further, in the above sodium bicarbonate dry flue gas desulfurization system, the desulfurizer supply device comprises a sodium bicarbonate storage bin, a grinder and a conveying fan which are connected in sequence.
Further, above-mentioned sodium bicarbonate dry process flue gas desulfurization system, wherein, particulate matter recovery unit is including the clear water storage tank, particulate matter warehouse, filter and the high salt solution storage tank that connect gradually.
Compared with the prior art, the method has the following technical effects:
(1) the desulfurized product is treated by adopting a particulate matter recovery device and a high-salinity water evaporative crystallization device, so that the sodium salt of the desulfurized product is recycled, and no secondary pollution is generated. The particle recovery device is used for collecting and separating particles collected by the bag-type dust collector, and the high-salt water evaporation crystallization device is used for separating salt and finally obtaining sodium sulfate and sodium chloride in the high-salt water.
(2) A sodium bicarbonate preheating pipe section and an adsorbent bed layer are arranged in the desulfurization reactor. The absorbent reaches the optimal reaction temperature by heating the sodium bicarbonate in advance, the retention time of the absorption reaction can be prolonged by adding the adsorbent bed in the reactor, and the desulfurization efficiency can be improved by the synergistic effect of the adsorbent bed and the adsorbent bed.
(3) The flue gas waste heat is recovered by the flue gas waste heat recovery device, and the recovered heat is reused in the evaporation process of the high-salt water evaporation crystallization device, so that energy conservation and consumption reduction are realized.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a sodium bicarbonate dry flue gas desulfurization system according to the present application.
Fig. 2 is a schematic view showing a detailed structure of the desulfurization reactor shown in fig. 1.
FIG. 3 is a schematic view showing a detailed structure of the high-salt water evaporative crystallization apparatus shown in FIG. 1.
FIG. 4 is a schematic view showing a detailed structure of the desulfurizing agent supplying apparatus shown in FIG. 1.
Fig. 5 is a schematic view showing a detailed structure of the particulate matter recovering device shown in fig. 1.
Detailed Description
The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.
As shown in fig. 1, the embodiment provides a sodium bicarbonate dry flue gas desulfurization system, which includes a desulfurizer supply device 10, a desulfurization reactor 20, a bag-type dust collector 30, a flue gas waste heat recovery device 40, a particulate matter recovery device 50, and a high-salt water evaporation crystallization device 60; the desulfurizer supply device 10 is connected with the desulfurization reactor 20 and is used for conveying a desulfurizer, namely sodium bicarbonate, into the desulfurization reactor 20; a sodium bicarbonate preheating pipe section 21 is arranged in the desulfurization reactor 20 and is used for heating a desulfurizing agent sodium bicarbonate to remove acidic substances in the flue gas; the bag-type dust collector 30 is connected with the desulfurization reactor 20 and is used for collecting fly ash and desulfurization products in the flue gas; the flue gas waste heat recovery device 40 is connected with the bag-type dust collector 30 and is used for recovering heat in flue gas; the particulate matter recovery device 50 is connected with the bag-type dust collector 30 and is used for collecting and separating fly ash and desulfurization products; the high-salt water evaporation and crystallization device 60 is connected with the particulate matter recovery device 50 and is used for evaporation, crystallization and separation to obtain solid sodium sulfate and solid sodium chloride in the high-salt water.
In this embodiment, the outlet of the desulfurizer supply device 10 is connected to the inlet of the sodium bicarbonate preheating pipe section 21 in the desulfurization reactor 20, the high-temperature raw flue gas containing acidic substances enters the reactor from the flue inlet at the bottom of the reactor, the sodium bicarbonate exchanges heat with the raw flue gas in the reactor in the preheating pipe section and then is heated to perform a chemical reaction, the decomposed and released carbon dioxide can enable the surface of the desulfurizer to form a plurality of microporous structures, so as to provide a large specific surface area, and simultaneously, the sodium carbonate generated by pyrolysis of the sodium bicarbonate can continuously participate in the removal reaction of the acidic substances. Therefore, compared with the prior art without the sodium bicarbonate preheating pipe section, the desulfurization efficiency is higher by additionally arranging the sodium bicarbonate preheating pipe section 21 in the reactor. The sodium carbonate and the raw flue gas reversely contact in the reactor and are subjected to neutralization reaction with acidic substances in the flue gas, and main products generated by the reaction are sodium salts such as sodium sulfate, sodium chloride and the like, and enter the bag-type dust collector 30 after passing through a flue outlet at the top of the reactor along with the flue gas. Solid particles such as reaction products sodium salt and fly ash carried in the flue gas are captured by a dust collector and collected into the particle recovery device 50. And the flue gas passes through the outlet of the bag-type dust collector 30, enters the flue gas waste heat recovery device 40, heats the deaerated water to generate steam, and residual heat in the flue gas is collected and then discharged out of the desulfurization system to complete the whole desulfurization process. The particulate matter recovery device 50 is used for separating fly ash and sodium salt in the collected particulate matter, wherein the fly ash is discharged out of the system, and the high-salt water containing sodium salt enters the high-salt water evaporation crystallization device 60, and solid sodium sulfate and solid sodium chloride are obtained after evaporation, crystallization and separation.
In the present embodiment, the desulfurization reactor 20 is defined as a fixed bed reactor, and the retention time of the chemical reaction between the absorbent and the acidic material in the gas is increased by at least one adsorbent bed layer 24 provided inside, thereby improving the desulfurization efficiency of the system. The number of adsorbents can be increased according to the desulfurization efficiency actually required.
In the present embodiment, the adsorbent used in the adsorbent bed 24 is defined as activated carbon. Because of the catalytic effect of the surface of the activated carbon, the activated carbon can play a role in removing acidic substances in the flue gas, so that the desulfurization efficiency of the system is further improved.
Further, as shown in fig. 3, the high-salt water evaporative crystallization apparatus 60 includes a primary evaporator 61, a freezing crystallizer 62, a sodium sulfate evaporative crystallizer 63, and a sodium chloride evaporative crystallizer 64.
In this embodiment, the high-salinity water containing sodium sulfate and sodium chloride separated by the particulate recovery device 50 is sent to the primary evaporator 61 for evaporation, the salt content of the high-salinity water is further concentrated to reach a saturated state, and then the high-salinity water is sent to the freezing crystallizer 62 for rapid cooling to obtain the precipitated Na2SO4·10H2O crystal and sodium chloride mother liquor to realize the salt separation of sodium sulfate and sodium chloride; then adding Na2SO4·10H2Conveying the O crystals to a sodium sulfate evaporation crystallizer 63, and performing evaporation crystallization purification to obtain sodium sulfate solid salt with the purity of more than 99%; the sodium chloride mother liquor is sent into a sodium chloride evaporative crystallizer 64 for evaporation, crystallization and purification, sodium chloride with the purity of more than 98 percent is produced, and the mother liquor in the sodium chloride evaporative crystallizer 64 returns to the evaporator 61 for cycle treatment once again.
Further, as shown in fig. 3, steam inlets of the primary evaporator 61, the sodium sulfate evaporative crystallizer 63 and the sodium chloride evaporative crystallizer 64 of the high-salt water evaporative crystallization device 60 are connected with a steam outlet of the flue gas waste heat recovery device 40.
In this embodiment, the steam collected by the flue gas waste heat recovery device 40 is used in the evaporation process of the high-salt water evaporation crystallization device 60, so as to achieve energy saving and consumption reduction.
Further, as shown in fig. 4, the desulfurizing agent supplying apparatus 10 includes a sodium bicarbonate storage 11, a grinder 12, and a conveying fan 13 connected in this order.
In this embodiment, the sodium bicarbonate as the desulfurizing agent is first conveyed to the grinding machine 12 through the sodium bicarbonate storage bin 11 for grinding operation, because the sodium bicarbonate after being ground into fine particles can increase the specific surface area, thereby improving the desulfurization efficiency of the system. The ground sodium bicarbonate particles are pressurized and conveyed to a sodium bicarbonate preheating pipe section 21 in the desulfurization reactor 20 by a conveying fan 13.
Further, as shown in fig. 5, the particulate matter recovery device 50 comprises a clean water storage tank 51, a particulate matter storage bin 52, a filter 53 and a high salt water storage tank 54 which are connected in sequence.
In this embodiment, solid particles such as sodium salt and fly ash collected by the bag-type dust collector 30 are collected in the particle storage 52, and are mixed with water delivered from the clean water storage tank 51 and stirred uniformly, so that the sodium salt is completely dissolved in the water, while the fly ash is insoluble in water, so that the fly ash can be separated and transported out after being filtered by the filter 53, and the remaining sodium-containing brine is delivered to the high-brine storage tank 54.
The utility model discloses sodium bicarbonate dry flue gas desulfurization system has realized the recycle of desulfurization product sodium salt, does not produce secondary pollution, and measures such as through add sodium bicarbonate preheating pipe section and adsorbent bed in the reactor, improves desulfurization efficiency, and the heat of flue gas waste heat recovery device recovery is reused in the evaporation process of high salt water evaporation crystallization device simultaneously, realizes energy saving and consumption reduction, has good popularization and application and worth.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.

Claims (7)

1. A sodium bicarbonate dry flue gas desulfurization system, which is characterized in that,
comprises a desulfurizer supply device, a desulfurization reactor, a bag-type dust collector, a flue gas waste heat recovery device, a particulate matter recovery device and a high-salt water evaporation crystallization device;
the desulfurizer supply device is connected with the desulfurization reactor and is used for conveying a desulfurizer, namely sodium bicarbonate, into the desulfurization reactor;
a sodium bicarbonate preheating pipe section is arranged in the desulfurization reactor and is used for heating desulfurizer sodium bicarbonate to remove acidic substances in the flue gas;
the bag-type dust collector is connected with the desulfurization reactor and is used for collecting fly ash and desulfurization products in flue gas;
the flue gas waste heat recovery device is connected with the bag-type dust collector and is used for recovering heat in flue gas;
the particle recovery device is connected with the bag-type dust collector and is used for collecting and separating fly ash and desulfurization products;
and the high-salinity water evaporation crystallization device is connected with the particulate matter recovery device and is used for evaporating, crystallizing and separating to obtain solid sodium sulfate and solid sodium chloride in the high-salinity water.
2. The sodium bicarbonate dry flue gas desulfurization system according to claim 1, wherein the desulfurization reactor is a fixed bed reactor, and comprises a flue gas inlet, a flue gas outlet and at least one adsorbent bed layer arranged inside the reactor.
3. The sodium bicarbonate dry flue gas desulfurization system according to claim 2, wherein the adsorbent used in the adsorbent bed is activated carbon.
4. The sodium bicarbonate dry flue gas desulfurization system according to claim 1 or 2, wherein the high-salt water evaporative crystallization device comprises a primary evaporator, a freezing crystallizer, a sodium sulfate evaporative crystallizer and a sodium chloride evaporative crystallizer.
5. The sodium bicarbonate dry flue gas desulfurization system according to claim 4, wherein the steam inlets of the primary evaporator of the high-salt water evaporative crystallization device, the sodium sulfate evaporative crystallizer and the sodium chloride evaporative crystallizer are connected with the steam outlet of the flue gas waste heat recovery device.
6. The sodium bicarbonate dry flue gas desulfurization system according to claim 1, wherein the desulfurizer supply device comprises a sodium bicarbonate storage bin, a grinder and a conveying fan which are connected in sequence.
7. The sodium bicarbonate dry flue gas desulfurization system according to claim 1, wherein the particulate recovery device comprises a clean water storage tank, a particulate storage bin, a filter and a high salt water storage tank which are connected in sequence.
CN201922120438.4U 2019-12-03 2019-12-03 Sodium bicarbonate dry flue gas desulfurization system Active CN211216182U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112642272A (en) * 2020-09-30 2021-04-13 湖南海联三一小苏打有限公司 Coal-fired flue gas treatment method for sodium bicarbonate dry desulphurization
CN115193236A (en) * 2022-06-28 2022-10-18 大唐环境产业集团股份有限公司 Sodium bicarbonate dechlorinating agent and preparation method and application thereof
CN117046865A (en) * 2023-10-11 2023-11-14 杭州尚善若水环保科技有限公司 Method for preparing in-furnace desulfurization and denitrification medicament by utilizing waste incineration fly ash

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112642272A (en) * 2020-09-30 2021-04-13 湖南海联三一小苏打有限公司 Coal-fired flue gas treatment method for sodium bicarbonate dry desulphurization
CN115193236A (en) * 2022-06-28 2022-10-18 大唐环境产业集团股份有限公司 Sodium bicarbonate dechlorinating agent and preparation method and application thereof
CN117046865A (en) * 2023-10-11 2023-11-14 杭州尚善若水环保科技有限公司 Method for preparing in-furnace desulfurization and denitrification medicament by utilizing waste incineration fly ash
CN117046865B (en) * 2023-10-11 2024-01-23 杭州尚善若水环保科技有限公司 Method for preparing in-furnace desulfurization and denitrification medicament by utilizing waste incineration fly ash

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