CN210645809U - Ultralow emission flue gas desulfurization and ammonia addition system - Google Patents
Ultralow emission flue gas desulfurization and ammonia addition system Download PDFInfo
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- CN210645809U CN210645809U CN201921178067.9U CN201921178067U CN210645809U CN 210645809 U CN210645809 U CN 210645809U CN 201921178067 U CN201921178067 U CN 201921178067U CN 210645809 U CN210645809 U CN 210645809U
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Abstract
The utility model relates to an ultralow emission flue gas desulfurization ammoniation system, spray, liquid trap and accessory pipeline etc. component constitution including ammoniation pond, absorption circulating pump, absorption section. It is characterized by that it provides the concept of "ammonium sulfite absorption", and sets an ammonia-adding pool in the oxidation section of traditional combined desulfurizing tower to form NH3、(NH4)2SO3In the high-concentration interval, the high-concentration absorption liquid and the high-sulfur flue gas are subjected to chemical reaction in the absorption section to generate partial NH4HSO3，NH4HSO3Reflux to the ammonia addition tank, withHigh-concentration ammonia water is reduced to (NH)4)2SO3And then enters the absorption section again to react with the high-sulfur flue gas, so as to form an 'ammonium sulfite absorption' cycle. Thereby removing sulfur and reaching the ultra-low emission standard of the sulfur content in the tail gas of the boiler.
Description
Technical Field
The utility model relates to a novel ultra-low emission flue gas desulfurization and ammonification process, which is applicable to coal-fired equipment with various structures and specifications and can ensure SO in tail gas2The content is lower than national and local discharge standards, and the ultra-low discharge requirement is met.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
The traditional ammonia desulphurization method mainly depends on the addition of an absorbent, namely ammonia water, to control SO in tail gas2The content of (a) is as follows: adding ammonia water into the oxidation section of the desulfurizing tower, mixing the ammonia water with the circulating liquid in the oxidation tank, then feeding the mixture into a first-stage circulating tank, pumping the mixed liquid into an absorption section of the desulfurizing tower through a first-stage circulating pump, wherein the absorption section is distributed with sprays, and the mixed liquid containing ammonia is sprayed and sprayed with the sprays to enter the desulfurizing towerIs contacted with the flue gas to carry out chemical reaction, thereby removing SO in the flue gas2. The adjusting process is long and inflexible, and after the ammonia water is used as an absorbent to participate in circulation, the chemical reaction potential difference of the circulating absorption liquid is gradually reduced along with the escape of ammonia, so that the activity is low, and the efficiency of the absorption liquid in treating waste gas is low. SO in discharged tail gas2High content of (D), which puts pressure on environmental protection.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a high-efficient removal of harmful substance SO in flue gas generated by coal-fired boilers of various types and specifications2The process comprises the following steps: ammonia water is stored in the ammonia adding pool and is directly pumped into the absorption section of the desulfurizing tower through the circulating pump to form NH3、(NH4)2SO3The high-concentration absorption liquid and the high-sulfur flue gas are subjected to chemical reaction in the absorption section to generate partial NH4HSO3，NH4HSO3Flows back to the ammonia adding pool to react with high-concentration ammonia water to be reduced into (NH)4)2SO3And then enters the absorption section again to react with the high-sulfur flue gas, so as to form an 'ammonium sulfite absorption' cycle. The sulfur content of the treated discharged tail gas reaches the national and local ultra-low emission standard, and the problem of SO in a large amount of flue gas generated in the production process of thermoelectric enterprises can be fully solved2The content exceeds the standard, the atmospheric resource environment is protected, the escape of ammonia is reduced, the content of aerosol in tail gas is effectively reduced, and more SO in the flue gas is generated2By chemical reaction into by-product (NH)4)2SO4And the comprehensive economic benefit of the thermoelectric enterprises is improved.
In order to realize the technical purpose, the utility model discloses a technical scheme as follows:
an ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower and an ammonia adding pool; the upper part of the desulfurizing tower is an absorption section, a spraying device is arranged above the absorption section, and a liquid collector and a corresponding absorption section reflux liquid outlet are arranged below the absorption section; the ammonia adding device is characterized in that a liquid outlet and an absorption liquid backflow inlet and an ammonia adding port are arranged at the bottom of the ammonia adding pool, the liquid outlet of the ammonia adding pool is connected with an absorption liquid spraying inlet of a spraying device of the desulfurizing tower, and the absorption liquid backflow inlet at the top of the ammonia adding pool is connected with an absorption section backflow liquid outlet.
The application adopts an ammonia adding pool to add ammonia in a concentrated way to form NH3、(NH4)2SO3In the high-concentration interval, the high-concentration absorption liquid and the high-sulfur flue gas are subjected to chemical reaction in the absorption section to generate partial NH4HSO3，NH4HSO3Flows back to the ammonia adding pool to react with high-concentration ammonia water to be reduced into (NH)4)2SO3And then enters the absorption section again to react with the high-sulfur flue gas, so as to form an 'ammonium sulfite absorption' cycle. Thereby removing sulfur and reaching the ultra-low emission standard of the sulfur content in the tail gas of the boiler.
In some embodiments, the desulfurization tower comprises an absorption section, a concentration section and an oxidation section from top to bottom in sequence. NH formed by flue gas passing through absorption section3、(NH4)2SO3The high concentration interval is reacted, the treatment efficiency of the flue gas can be effectively improved, and the SO in the discharged tail gas is reduced2The content of (a).
In some embodiments, an absorption circulating pump is arranged between the liquid outlet of the ammonia adding tank and the absorption liquid spraying inlet of the spraying device of the desulfurization tower. And the absorption circulating pump is utilized to enable the high-concentration desulfurization absorption liquid to enter the absorption section for spraying, the absorption liquid fully reacts with the high-sulfur flue gas entering the desulfurization tower, and the sulfur is removed by mass transfer and heat transfer to complete chemical absorption.
In some embodiments, the flue gas inlet is located in the concentration section. After the flue gas enters the concentration section and contacts with the sprayed concentrated solution, the temperature of the flue gas is reduced, the subsequent reaction efficiency in the absorption section is improved, and the concentrated solution is concentrated after being heated and evaporated by the flue gas, so that the flue gas is convenient to recover.
In order to meet the requirements of different flue gas treatment capacities, in some embodiments, a plurality of groups of absorption liquid spraying inlets are arranged on the spraying device, so that the spraying efficiency of the absorption liquid is effectively improved, and the treatment capacity of the flue gas is ensured.
The beneficial effects of the utility model reside in that:
(1) the utility model can be continuously stable for a long timeThe high-sulfur tail gas of coal-fired thermoelectric enterprises is efficiently treated, the flow is simple, the automatic adjustment is simple, the equipment investment is low, the tail gas treatment effect reaches the national and local ultra-low emission standard, the system is flexible to operate, the ammonia adding amount can be flexibly adjusted according to the sulfur content in the original flue gas of the furnace and the concentration of added ammonia water, and the desulfurization system is in the optimal state of long-term, stable and efficient operation. The method can greatly improve the flue gas treatment capacity of coal-fired thermoelectric enterprises in the long run, solve the production bottleneck problem caused by the generation of a large amount of sulfur over-standard tail gas, protect the natural environment, improve the surrounding environment-friendly situation and increase the environment-friendly benefit of the enterprises; the sulfide which is captured in the reaction chamber is converted into (NH) through chemical reaction4)2SO4After being dried and processed, the fertilizer can be taken out as a raw material of a compound fertilizer, thereby increasing the economic benefit of enterprises.
(2) The device has the advantages of simple structure, low cost, universality and easiness in large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the process flow of the present invention,
wherein, 1, an ammonia adding pool, 2, a spraying device and 3, a liquid collector;
a, an ammonia adding pool liquid outlet, B1, B2, an absorption liquid spraying inlet, C, an absorption section reflux liquid outlet, D, an absorption liquid reflux inlet and E, wherein the absorption section reflux liquid outlet is connected with the absorption section reflux liquid inlet;
equipment T0101-desulfurizing tower P0101A/B-absorption circulating pump
FIG. 2 is a simplified diagram of a novel ultra-low emission flue gas desulfurization and ammoniation process;
FIG. 3 is a schematic diagram of a conventional ammoniation process.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the efficiency of treating the exhaust gas by the traditional ammonia desulphurization method is low, and SO in the discharged tail gas is low2The content of (B) is high. Therefore, the utility model provides a novel ultralow emission flue gas desulfurization ammoniating process, which adopts an ammoniating pool to intensively ammoniate to form NH3、(NH4)2SO3In the high-concentration interval, the high-concentration absorption liquid and the high-sulfur flue gas are subjected to chemical reaction in the absorption section to generate partial NH4HSO3，NH4HSO3Flows back to the ammonia adding pool to react with high-concentration ammonia water to be reduced into (NH)4)2SO3And then enters the absorption section again to react with the high-sulfur flue gas, so as to form an 'ammonium sulfite absorption' cycle. Thereby removing sulfur and reaching the ultra-low emission standard of the sulfur content in the tail gas of the boiler.
Preferably, an ammonia adding pool is arranged at the oxidation section of the desulfurizing tower to form the solution containing NH3、(NH4)2SO3The desulfurization absorption liquid with high concentration.
Preferably, the high-concentration desulfurization absorption liquid enters the absorption section through the absorption circulating pump to be sprayed, the absorption liquid fully reacts with the high-sulfur flue gas entering the desulfurization tower, and the sulfur is removed by mass transfer and heat transfer to complete chemical absorption.
Preferably, after the high-concentration desulfurization solution and the high-sulfur flue gas are reacted, part of NH is generated4HSO3，NH4HSO3Flows back to the ammonia adding pool to react with high-concentration ammonia water to be reduced into (NH)4)2SO3Then enters the absorption section again to react with the high-sulfur flue gas to form' ammonium sulfite absorptionAnd (4) circulating.
The technical solution of the present application will be described below with specific examples.
Example 1:
an ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower T0101 and an ammonia adding pool 1; the upper part of the desulfurizing tower T0101 is an absorption section, a spraying device 2 is arranged above the absorption section, and a liquid collector 3 and a corresponding absorption section reflux liquid outlet C are arranged below the absorption section; add 1 bottom in ammonia pond and be provided with liquid outlet A, top and be provided with absorption liquid backward flow import D and add ammonia mouth E, the liquid outlet A that adds 1 in ammonia pond and desulfurizing tower T0101's spray set 2's absorption liquid sprays import B1, B2 and links to each other, add the absorption liquid backward flow import D at 1 top in ammonia pond with absorption section backward flow liquid export C links to each other.
The operation mode is as follows: as shown in figure 1, the utility model discloses after desulfurizing tower T0101 oxidation section is inside to calculate qualified through stress and structure, separate the space that the volume is suitable with the steel construction, add ammonia tank 1 promptly. The lower part of the ammonia adding pool 1 is provided with a liquid outlet A, and the upper part is provided with an absorption liquid reflux inlet D and an ammonia adding port E. The desulfurizing tower T0101 carries out water injection empty test before letting in the flue gas, after each equipment water circulation operation is stable, begin to add ammonia to the ammoniating pond 1 through adding ammonia mouth E, the aqueous ammonia is gone into the absorption section through absorption circulating pump P0101A/B pump and is sprayed, through shower nozzle evenly distributed at desulfurizing tower T0101 cross section, with get into the high sulphur flue gas of desulfurizing tower T0101 upgoing full contact, carry out chemical reaction, form with NH3、(NH4)2SO3、NH4HSO3Mainly circulating liquid. The circulating liquid passes through a liquid collector 3 below the absorption section, and the circulating liquid is concentrated and returns to the top of the ammonia adding pool 1 through a backflow liquid outlet of the absorption section. In the ammonia adding tank 1, NH4HSO3Is chemically reacted with continuously added ammonia water to generate (NH)4)2SO3Completing the absorption medium (NH)4)2SO3And (4) recovering. The PH value of the mixed liquid in the ammonia adding pool 1 is controlled to be 5.5-6.5, so as to ensure that the absorption liquid (NH)4)2SO3Stably enters a T0101 absorption section of the desulfurizing tower to stably and efficiently remove SO in the flue gas2Complete cycle of "absorption of ammonium sulfite" is completedAnd (4) performing a loop process.
The field test result shows that: coal burned by the existing coal-fired boiler is sulfur-containing coal, and sulfur dioxide, sulfur trioxide and other sulfides can be generated by burning the coal in a hearth. According to the sulfur content in the coal, the sulfur content in the flue gas after combustion is about 1200mg/Nm3After the ultra-low emission flue gas desulfurization and ammonia addition system is used for treatment, the sulfur content of the discharged tail gas can reach 35mg/Nm3The method meets the ultra-low emission standard of the flue gas.
Example 2
An ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower T0101 and an ammonia adding pool 1; the upper part of the desulfurizing tower T0101 is an absorption section, a spraying device 2 is arranged above the absorption section, and a liquid collector 3 and a corresponding absorption section reflux liquid outlet C are arranged below the absorption section; add 1 bottom in ammonia pond and be provided with liquid outlet A, top and be provided with absorption liquid backward flow import D and add ammonia mouth E, the liquid outlet A that adds 1 in ammonia pond and desulfurizing tower T0101's spray set 2's absorption liquid sprays import B1, B2 and links to each other, add the absorption liquid backward flow import D at 1 top in ammonia pond with absorption section backward flow liquid export C links to each other.
In this embodiment, the desulfurization tower T0101 is composed of an absorption section, a concentration section, and an oxidation section in this order from top to bottom. NH formed by flue gas passing through absorption section3、(NH4)2SO3The high concentration interval is reacted, the treatment efficiency of the flue gas can be effectively improved, and the SO in the discharged tail gas is reduced2The content of (a).
The procedure was as in example 1.
Example 3
An ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower T0101 and an ammonia adding pool 1; the upper part of the desulfurizing tower T0101 is an absorption section, a spraying device 2 is arranged above the absorption section, and a liquid collector 3 and a corresponding absorption section reflux liquid outlet C are arranged below the absorption section; add 1 bottom in ammonia pond and be provided with liquid outlet A, top and be provided with absorption liquid backward flow import D and add ammonia mouth E, the liquid outlet A that adds 1 in ammonia pond and desulfurizing tower T0101's spray set 2's absorption liquid sprays import B1, B2 and links to each other, add the absorption liquid backward flow import D at 1 top in ammonia pond with absorption section backward flow liquid export C links to each other.
In this embodiment, an absorption circulation pump P0101A/B is disposed between the liquid outlet a of the ammonia adding tank 1 and the absorption liquid spraying inlets B1, B2 of the spraying device of the desulfurizing tower T0101. And (3) enabling high-concentration desulfurization absorption liquid to enter an absorption section for spraying by using an absorption circulating pump, fully reacting the absorption liquid with the high-sulfur flue gas entering the desulfurization tower T0101, and performing mass and heat transfer to complete chemical absorption to remove sulfur.
The operation was carried out in the same manner as in example 1.
Example 4
An ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower T0101 and an ammonia adding pool 1; the upper part of the desulfurizing tower T0101 is an absorption section, a spraying device 2 is arranged above the absorption section, and a liquid collector 3 and a corresponding absorption section reflux liquid outlet C are arranged below the absorption section; add 1 bottom in ammonia pond and be provided with liquid outlet A, top and be provided with absorption liquid backward flow import D and add ammonia mouth E, the liquid outlet A that adds 1 in ammonia pond and desulfurizing tower T0101's spray set 2's absorption liquid sprays import B1, B2 and links to each other, add the absorption liquid backward flow import D at 1 top in ammonia pond with absorption section backward flow liquid export C links to each other.
In this embodiment, the flue gas inlet is located in the concentration section. After the flue gas enters the concentration section and contacts with the sprayed concentrated solution, the temperature of the flue gas is reduced, the subsequent reaction efficiency in the absorption section is improved, and the concentrated solution is concentrated after being heated and evaporated by the flue gas, so that the flue gas is convenient to recover.
The operation was carried out in the same manner as in example 1.
Example 5
An ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower T0101 and an ammonia adding pool 1; the upper part of the desulfurizing tower T0101 is an absorption section, a spraying device 2 is arranged above the absorption section, and a liquid collector 3 and a corresponding absorption section reflux liquid outlet C are arranged below the absorption section; add 1 bottom in ammonia pond and be provided with liquid outlet A, top and be provided with absorption liquid backward flow import D and add ammonia mouth E, the liquid outlet A that adds 1 in ammonia pond and desulfurizing tower T0101's spray set 2's absorption liquid sprays import B1, B2 and links to each other, add the absorption liquid backward flow import D at 1 top in ammonia pond with absorption section backward flow liquid export C links to each other.
In order to meet the requirements of different flue gas treatment capacities, in the embodiment, the spraying device 2 is provided with a plurality of groups of absorption liquid spraying inlets B1 and B2, so that the spraying efficiency of the absorption liquid is effectively improved, and the flue gas treatment capacity is ensured.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and 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 the technical solutions described in the foregoing embodiments can be modified or partially replaced by equivalent solutions. 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. Although the foregoing describes the embodiments of the present invention, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (5)
1. An ultra-low emission flue gas desulfurization and ammoniation system, comprising: a desulfurizing tower and an ammonia adding pool; the upper part of the desulfurizing tower is an absorption section, a spraying device is arranged above the absorption section, and a liquid collector and a corresponding absorption section reflux liquid outlet are arranged below the absorption section; the ammonia adding device is characterized in that a liquid outlet and an absorption liquid backflow inlet and an ammonia adding port are arranged at the bottom of the ammonia adding pool, the liquid outlet of the ammonia adding pool is connected with an absorption liquid spraying inlet of a spraying device of the desulfurizing tower, and the absorption liquid backflow inlet at the top of the ammonia adding pool is connected with an absorption section backflow liquid outlet.
2. The ultra-low emission flue gas desulfurization and ammonia addition system of claim 1, wherein the desulfurization tower comprises an absorption section, a concentration section and an oxidation section from top to bottom in sequence.
3. The ultra-low emission flue gas desulfurization and ammonia addition system of claim 1, wherein an absorption circulation pump is arranged between the liquid outlet of the ammonia addition tank and the absorption liquid spraying inlet of the spraying device of the desulfurization tower.
4. The ultra-low emission flue gas desulfurization and ammonia addition system of claim 1, wherein the flue gas inlet is located in the concentration section.
5. The ultra-low emission flue gas desulfurization and ammonia addition system according to claim 1, wherein a plurality of groups of absorption liquid spray inlets are arranged on the spray device.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113082979A (en) * | 2021-04-09 | 2021-07-09 | 聊城市鲁西化工工程设计有限责任公司 | Flue gas desulfurization and dust removal integrated device, process and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113082979A (en) * | 2021-04-09 | 2021-07-09 | 聊城市鲁西化工工程设计有限责任公司 | Flue gas desulfurization and dust removal integrated device, process and application |
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