Kiln flue gas treatment system

Abstract

The invention provides a kiln flue gas treatment system, and relates to the technical field of flue gas treatment. The system comprises a boron removal device which is connected with a kiln, is filled with liquid and is used for dissolving boron oxide in flue gas discharged by the kiln into the liquid to form a boric acid solution so as to remove boron oxide in the flue gas; and the absorption device is connected with the boron removal device and is used for absorbing and treating the boric acid solution. The system is used for removing boron oxide in flue gas, and damage to equipment and air pollution are avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of flue gas treatment, and in particular to a kiln flue gas treatment system. Background Art

[0002] In industrial production, kiln flue gas contains a variety of pollutants, among which boron oxide has an impact on the environment, health, equipment corrosion and industrial product quality. Its emission in flue gas will seriously threaten the balance of natural ecosystems. Boron oxide is not easily decomposed naturally. Long-term accumulation in soil and water will lead to a decline in ecological environment quality, affect plant growth and development, interfere with the food chain of aquatic ecosystems, and may lead to a decrease in species diversity. In addition, boron oxide can be further spread through rainwater runoff, expanding the scope of pollution and posing a potential threat to a wider area.

[0003] In high-temperature industrial processes, boric oxide in flue gas can react with water vapor to form boric acid, which is corrosive and can corrode metal surfaces, especially equipment made of aluminum, iron and other materials, such as chimney linings, heat exchanger pipes, etc. This corrosion not only shortens the service life of equipment and increases the maintenance and replacement costs of enterprises, but may also cause safety accidents due to equipment failure, threatening production safety. Summary of the invention

[0004] A technical problem to be solved by the present disclosure is: how to remove boron oxide in flue gas to avoid damage to equipment and air pollution.

[0005] In order to solve the above-mentioned technical problems, an embodiment of the present disclosure provides a kiln flue gas treatment system, which includes: a deboronization device connected to the kiln, the deboronization device is filled with liquid, and is used to dissolve the boron oxide in the flue gas discharged from the kiln in the liquid to form a boric acid solution to remove the boron oxide in the flue gas; and an absorption device connected to the deboronization device, and is used to absorb and treat the boric acid solution.

[0006] In some embodiments, the liquid in the deboronization unit is water.

[0007] In some embodiments, the absorption device contains triethanolamine, which is used to react triethanolamine with boric acid to generate triethanolamine borate precipitate.

[0008] In some embodiments, the system further comprises: a water pump connected between the deboronization device and the absorption device, for transporting the boric acid solution in the deboronization device to the absorption device.

[0009] In some embodiments, a water injection port is provided on the deboronation device for injecting liquid into the deboronation device.

[0010] In some embodiments, the system further comprises: a dehydration device connected to the deboronation device, wherein the dehydration device contains activated carbon for removing moisture from the flue gas.

[0011] In some embodiments, the system further includes: a desulfurization reactor connected to the dehydration device, wherein the desulfurization reactor contains a desulfurizer for removing sulfide gas from the flue gas.

[0012] In some embodiments, the system further includes: a denitrification reactor connected to the desulfurization reactor, wherein the denitrification reactor contains a denitrification catalyst for removing nitrogen oxides from the flue gas.

[0013] In some embodiments, the system further includes: a dust removal reactor connected to the denitrification reactor, wherein a dust removal bag is provided in the dust removal reactor for filtering particulate matter in the flue gas.

[0014] In some embodiments, the system further includes: a chimney, disposed at the end of the system, for exhausting smoke; and an induced draft fan, disposed at the front end of the chimney, for providing a negative pressure to the entire system to drive the flow of smoke and exhaust it from the chimney.

[0015] Through the above technical scheme, the kiln flue gas treatment system provided by the present invention can directly pass the high-temperature flue gas discharged from the kiln into the deboronization device. At high temperature, the boron oxide in the flue gas dissolves in water to form boric acid, thereby separating the boron oxide from the flue gas. After the boric acid is generated in the deboronization device, the absorption device absorbs and treats the boric acid in time, thereby avoiding the pollution of the environment by boron oxide and the damage to the equipment in the subsequent treatment of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a schematic structural diagram of a kiln fume treatment system disclosed in an embodiment of the present disclosure;

[0018] Figure 2 It is a schematic diagram of the process of flue gas treatment of the kiln flue gas treatment system disclosed in the embodiment of the present disclosure;

[0019] Figure 3 It is a schematic diagram of the process flow of the kiln flue gas treatment system disclosed in the embodiment of the present disclosure.

[0020] Description of reference numerals:

[0021] 1. Kiln; 2. Deboronization device; 3. Water pump; 4. Absorption device; 5. Dehydration device; 6. Desulfurization reactor; 7. Denitrification reactor; 8. Dust removal reactor; 9. Induced draft fan; 10. Chimney; 11. Water injection port. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0023] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0024] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0025] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0026] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0027] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0029] Figure 1 is a structural schematic diagram of a kiln fume treatment system disclosed in an embodiment of the present disclosure, Figure 2 is a flow chart of the flue gas treatment process of the kiln flue gas treatment system disclosed in the embodiment of the present disclosure, combined with Figure 1 and Figure 2 As shown, the system includes: a deboronization device 2 connected to the kiln 1, the deboronization device 2 is filled with liquid, which is used to dissolve the boron oxide in the flue gas discharged from the kiln 1 in the liquid to form a boric acid solution to remove the boron oxide in the flue gas; and an absorption device 4 connected to the deboronization device 2, which is used to absorb and treat the boric acid solution.

[0030] It is understandable that the temperature of the flue gas discharged from the kiln 1 is relatively high, and boric oxide is easily soluble in water to form boric acid at high temperatures. In the system proposed in the present disclosure, the flue gas discharged from the kiln 1 directly enters the deboronization device 2 filled with liquid, so that the boric oxide at high temperature dissolves in water to form boric acid, thereby separating the boric oxide from the flue gas. After the boric acid is generated in the deboronization device 2, the absorption device 4 absorbs and processes the boric acid in time, thereby avoiding the pollution of the environment by boric oxide and the damage to the equipment in the subsequent treatment of the flue gas.

[0031] In some embodiments, the liquid of the deboronization device 2 is water. It should be noted that the use of water as the liquid in the deboronization device 2 can reduce production costs. In fact, boron oxide can be dissolved in water to form boric acid, and can also be dissolved in an alkaline solution to form borates. Therefore, in a specific implementation, an alkaline solution can also be used to remove boron oxide.

[0032] In some embodiments, the absorption device 4 contains triethanolamine, which is used to react triethanolamine with boric acid to generate triethanolamine borate precipitate. The triethanolamine borate precipitate is generated in the absorption device 4 and then precipitated, thereby completing the treatment of boric acid.

[0033] In some embodiments, the system further includes: a water pump 3, connected between the deboronation device 2 and the absorption device 4, for transporting the boric acid solution in the deboronation device 2 to the absorption device 4. The water pump 3 is used to provide power for the transportation of the boric acid solution, making the transportation of the boric acid solution more efficient.

[0034] In some embodiments, a water injection port 11 is provided on the deboronization device 2 for injecting liquid into the deboronization device 2 .

[0035] During the operation of the system, the liquid in the deboronization device 2 is continuously consumed, and liquid needs to be promptly injected into the deboronization device 2 through the water injection port 11. The present disclosure does not limit the shape and position of the water injection port 11, as long as the liquid can be injected without liquid backflow.

[0036] In some embodiments, the system further includes: a dehydration device 5 connected to the deboronization device 2, wherein the dehydration device 5 contains activated carbon for removing moisture from the flue gas.

[0037] The flue gas will carry moisture when running in the pipeline and being processed in the deboronization device 2. After the deboronization device 2 is arranged after the deboronization device 2, the moisture contained in the flue gas can be removed, thereby avoiding the influence on the subsequent treatment of the flue gas.

[0038] In some embodiments, the system further includes: a desulfurization reactor 6 connected to the dehydration device 5, and the desulfurization reactor 6 contains a desulfurizer for removing sulfide gas from the flue gas.

[0039] The desulfurizing agent may be ammonia, limestone, quicklime or slaked lime, etc. It should be noted that the present disclosure may adopt the desulfurization reactor 6 in the prior art, and any prior art capable of removing sulfide gas from flue gas may be applied to the present disclosure.

[0040] In some embodiments, the system further includes: a denitration reactor 7 connected to the desulfurization reactor 6, wherein the denitration reactor 7 contains a denitration catalyst for removing nitrogen oxides from flue gas. The present disclosure may adopt the denitration reactor 7 in the prior art, and any prior art capable of removing nitrogen oxides from flue gas may be applied to the present disclosure.

[0041] In some embodiments, the system further includes: a dust removal reactor 8 connected to the denitration reactor 7, and a dust removal bag is provided in the dust removal reactor 8 for filtering particulate matter in the flue gas.

[0042] After the above treatment of the flue gas, there is still a certain amount of dust in the flue gas, part of which is in the flue gas itself, and part of which is produced by the reaction in the above treatment. Too high dust content in the flue gas will cause pollution to the atmosphere, so dust removal is required to ensure that the dust is removed so that the flue gas emissions meet environmental protection standards.

[0043] In some embodiments, the system further includes: a chimney 10, disposed at the end of the system for exhausting smoke; an induced draft fan 9, disposed at the front end of the chimney 10, for providing a negative pressure to the entire system to drive the flow of smoke and exhaust it from the chimney 10.

[0044] The induced draft fan 9 is used to form negative pressure to drive the flow of smoke, provide power for the exhaust of smoke, help avoid the retention of smoke in the system, and ensure the stable operation of the system.

[0045] Figure 3 This is a process flow diagram of the kiln fume treatment system disclosed in the embodiment of the present disclosure, please refer to Figure 3 The flue gas discharged from the kiln 1 contains boron oxide, nitride, sulfide and particulate matter. In the deboronization device 2, the boron oxide is removed, but moisture is carried in the flue gas; then it enters the dehydration device 5, where activated carbon is used to remove moisture, and nitride, sulfide and particulate matter remain in the flue gas; then it enters the desulfurization reactor 6, where quicklime or ammonia or other desulfurizers are used to remove sulfides, and nitride and particulate matter remain in the flue gas; then it enters the denitrification reactor 7, where a denitrification catalyst is used to remove nitrogen oxides; finally it enters the dust removal reactor 8, where dust bags are used to remove particulate matter, and the entire system completes the treatment of the flue gas, so that the flue gas meets the emission standards.

[0046] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0047] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A kiln fume treatment system, characterized in that: The system comprises: a deboronization device (2) connected to the kiln (1), wherein the deboronization device (2) contains a liquid for dissolving the boron oxide in the flue gas discharged from the kiln (1) in the liquid to form a boric acid solution, so as to remove the boron oxide in the flue gas; and An absorption device (4) is connected to the deboronization device (2) and is used to absorb and treat the boric acid solution.

2. The system according to claim 1, characterized in that The liquid in the deboronization device (2) is water.

3. The system according to claim 1, characterized in that The absorption device (4) contains triethanolamine, which is used to react the triethanolamine with the boric acid to generate triethanolamine borate precipitate.

4. The system according to claim 1, characterized in that The system further comprises: A water pump (3) is connected between the deboronization device (2) and the absorption device (4) and is used to transport the boric acid solution in the deboronization device (2) to the absorption device (4).

5. The system according to claim 1, characterized in that The deboronization device (2) is provided with a water injection port (11) for injecting liquid into the deboronization device (2).

6. The system according to claim 1, characterized in that The system further comprises: A dehydration device (5) is connected to the deboronization device (2), wherein the dehydration device (5) contains activated carbon for removing moisture from the flue gas.

7. The system according to claim 6, characterized in that The system further comprises: The desulfurization reactor (6) is connected to the dehydration device (5). The desulfurization reactor (6) contains a desulfurizer for removing sulfide gas from the flue gas.

8. The system according to claim 7, characterized in that The system further comprises: The denitration reactor (7) is connected to the desulfurization reactor (6). The denitration reactor (7) contains a denitration catalyst for removing nitrogen oxides in the flue gas.

9. The system according to claim 8, characterized in that The system further comprises: The dust removal reactor (8) is connected to the denitration reactor (7), and a dust removal bag is provided in the dust removal reactor (8) for filtering particulate matter in the flue gas.

10. The system according to claim 1, characterized in that The system further comprises: A chimney (10), arranged at the end of the system, for discharging the smoke; The induced draft fan (9) is arranged at the front end of the chimney (10) and is used to provide a negative pressure to the entire system to drive the flow of the smoke and discharge it from the chimney (10).

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