CN218178930U - Waste incineration power plant flue gas flue system with low-temperature corrosion prevention function - Google Patents
Waste incineration power plant flue gas flue system with low-temperature corrosion prevention function Download PDFInfo
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- CN218178930U CN218178930U CN202222055615.7U CN202222055615U CN218178930U CN 218178930 U CN218178930 U CN 218178930U CN 202222055615 U CN202222055615 U CN 202222055615U CN 218178930 U CN218178930 U CN 218178930U
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Abstract
The utility model discloses a waste incineration power plant flue gas flue system with low temperature anticorrosive function, including flue gas flue system body, glass scale anticorrosive coating and a plurality of flue baffle. A first flue baffle is arranged at the communication part of a bypass flue of the flue gas flue system body and a bag outlet flue gas pipeline, a second flue baffle is arranged on a GGH inlet pipeline, a third flue baffle is arranged on a GGH outlet pipeline, a fourth flue baffle is arranged on an SCR reaction tower inlet pipeline, a fifth flue baffle is arranged on an SCR reaction tower outlet pipeline, and a sixth flue baffle is arranged between a first gas outlet and a second gas inlet of the bypass flue; the glass flake anticorrosive coatings are fixedly arranged on the inner cavity wall of the bypass flue between the first flue baffle and the sixth flue baffle, the inner cavity wall of the wet type washing tower gas inlet pipeline, the wet type washing tower gas outlet pipeline, the GGH gas outlet pipe and the inner cavity wall of the SCR reaction tower gas inlet pipeline respectively. The utility model discloses can effectively improve the anticorrosion ability of waste incineration power plant flue gas flue system in the low temperature flue gas.
Description
Technical Field
The utility model belongs to msw incineration power plant equipment field especially relates to a msw incineration power plant flue gas system with anticorrosive function of low temperature.
Background
In order to reach or even exceed the emission standard of European Union, the waste incineration power plant needs to adopt a flue gas purification process of 'SNCR + semidry method + dry method + active carbon + wet method + SCR', and the flue gas generated in the waste incineration process contains SO 3 The dew point temperature is greatly increased, when the temperature of the flue gas is lower than the dew point, condensate liquid is generated, and the condensate liquid is sulfuric acid solution with high concentration, so that the metal parts in the system are seriously corroded by low-temperature acid. After being treated by the wet system in the flue gas purification process, the temperature of the flue gas is lower than the dew point temperature.
Particularly, when the heat exchanger of the wet system is blocked, the heat exchange efficiency is greatly reduced, so that the outlet temperature of the low-temperature section of the heat exchanger is lower than 110 ℃, and at the moment, low-temperature flue gas is condensed on the surface of the outlet flue of the wet system and a subsequent circulating flue of the outlet flue of the wet system to form condensate, so that a flue gas flue system is corroded.
Therefore, the design of a flue gas flue system with low-temperature corrosion prevention function for a waste incineration power plant becomes a research direction.
SUMMERY OF THE UTILITY MODEL
In order to solve the not enough of prior art existence, the utility model provides a waste incineration power plant flue gas flue system with low temperature anticorrosive function utilizes flue baffle and the setting of glass scale anticorrosive coating at each pipeline inner chamber wall, effectively improves the corrosion protection ability of waste incineration power plant flue gas system in the low temperature flue gas, delays the maintenance interval, improves boiler continuous operation hours and operation economy, solves the excessive corrosion problem that causes the system under the special operating mode.
In order to achieve the purpose, the utility model discloses an embodiment's a waste incineration power plant flue gas flue system with low temperature anticorrosive function, it includes waste incineration power plant flue gas flue system body, glass scale anticorrosive coating and a plurality of flue baffle.
The flue gas flue system body comprises a cloth bag outlet flue gas pipeline, a bypass flue, a wet system heat exchanger GGH gas inlet pipeline, a GGH gas outlet pipeline, a wet scrubber tower gas inlet pipeline, a wet scrubber tower gas outlet pipeline, an SCR reaction tower gas inlet pipeline, an SCR reaction tower gas outlet pipeline and a smoke exhaust pipeline; the outlet end of the bag outlet flue gas pipeline is respectively communicated with a GGH inlet pipeline of the wet system heat exchanger and a first end of the bypass flue, the GGH inlet pipeline is connected with a GGH first channel, the GGH first channel is communicated with an inlet of a wet scrubber tower through an inlet pipeline of the wet scrubber tower, an outlet of the wet scrubber tower is communicated with a GGH second channel through an outlet pipeline of the wet scrubber tower, and the GGH second channel is communicated with a first inlet of the bypass flue through the GGH outlet pipeline; the SCR reaction tower assembly is communicated with a first air outlet of the bypass flue through an SCR reaction tower air inlet pipeline, and the SCR reaction tower assembly is communicated with a second air inlet of the bypass flue through an SCR reaction tower air outlet pipeline; and the second end of the bypass flue is communicated with an induced draft fan, and the induced draft fan is communicated with a chimney through a smoke exhaust pipeline.
The bypass flue and the bag outlet flue gas pipeline are communicated to form a first flue baffle, the GGH inlet pipeline is provided with a second flue baffle, the GGH outlet pipeline is provided with a third flue baffle, the SCR reaction tower inlet pipeline is provided with a fourth flue baffle, the SCR reaction tower outlet pipeline is provided with a fifth flue baffle, a sixth flue baffle is arranged between a first gas outlet and a second gas inlet of the bypass flue, and the flue baffles can be opened or closed as required.
And the glass flake anticorrosive layers are fixedly arranged on the inner cavity wall of the bypass flue between the first flue baffle and the sixth flue baffle, the inner cavity wall of the gas inlet pipeline of the wet scrubbing tower, the inner cavity wall of the gas outlet pipeline of the GGH and the inner cavity wall of the gas inlet pipeline of the SCR reaction tower.
Further, a high-temperature anti-corrosion paint layer is fixedly arranged on the inner cavity wall of the smoke exhaust pipeline.
Furtherly, bypass flue inner chamber wall between draught fan and the sixth flue baffle has set firmly the high temperature anticorrosive paint layer.
Further, a high-temperature anti-corrosion paint layer is fixedly arranged on the inner cavity wall of the air outlet pipeline of the SCR reaction tower.
The utility model has the advantages that:
the utility model discloses many places flue baffle has been set up in flue gas flue system to pertinence ground has set up the glass scale anticorrosive coating on probably receiving the inner chamber wall of low temperature corrosion pipeline, effectively improves the corrosion protection ability of flue gas system of msw incineration power plant in the low temperature flue gas, delays the maintenance interval, improves boiler continuous operation hours and operation economy, solves the excessive corrosion problem that causes the system under the special operating mode.
Drawings
FIG. 1 is a schematic structural diagram of a flue gas system of a waste incineration power plant with a low-temperature corrosion prevention function.
In the figure:
the device comprises a bypass flue 1, a GGH gas inlet pipeline 2, a GGH gas outlet pipeline 3, a wet scrubber tower gas inlet pipeline 4, a wet scrubber tower gas outlet pipeline 5, an SCR reaction tower gas inlet pipeline 6, an SCR reaction tower gas outlet pipeline 7, a smoke exhaust pipeline 8, an SCR reaction tower assembly 9, an induced draft fan 10, a first flue baffle 11, a second flue baffle 12, a third flue baffle 13, a fourth flue baffle 14, a fifth flue baffle 15, a sixth flue baffle 16, a chimney 20 and a wet scrubber tower 30.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the following description is further made with reference to the accompanying drawings and examples.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model discloses an on the basis based on the former flue material of msw incineration power plant (Q235 steel), reach the effect of reinforceing the anticorrosive ability of flue through newly-increased glass scale anticorrosive coating structure, the problem that the heat exchanger blockked up and lead to heat exchange efficiency to descend can appear in the waste incineration power plant actual motion in-process, if the clear stifled of not blowing out, the smoke temperature will be less than the design value and leads to the low temperature corrosion problem to the flue, can reinforce the corrosion resisting property of flue after having adopted this technical scheme, delay the interval of blowing out, improve boiler operation hours and economic nature.
As shown in the attached drawing 1, the utility model provides a waste incineration power plant flue gas flue system with low temperature anti-corrosion function, it includes waste incineration power plant flue gas flue system body, glass scale anticorrosive coating and a plurality of flue baffle.
The flue gas flue system body comprises a cloth bag outlet flue gas pipeline, a bypass flue 1, a GGH gas inlet pipeline 2, a GGH gas outlet pipeline 3, a wet scrubber tower gas inlet pipeline 4, a wet scrubber tower gas outlet pipeline 5, an SCR reaction tower gas inlet pipeline 6, an SCR reaction tower gas outlet pipeline 7 and a smoke exhaust pipeline 8; the outlet end of a bag outlet flue gas pipeline is respectively communicated with a GGH inlet pipeline 2 of a wet system heat exchanger and a first end of a bypass flue 1, the GGH inlet pipeline 2 is connected with a first GGH channel, the first GGH channel is communicated with an inlet of a wet scrubber tower through a wet scrubber tower inlet pipeline 4, an outlet of the wet scrubber tower is communicated with a second GGH channel through a wet scrubber tower outlet pipeline 5, and the second GGH channel is communicated with a first inlet of the bypass flue 1 through a GGH outlet pipeline 3; the SCR reaction tower assembly 9 is communicated with a first air outlet of the bypass flue 1 through an SCR reaction tower air inlet pipeline 6, and the SCR reaction tower assembly 9 is communicated with a second air inlet of the bypass flue 1 through an SCR reaction tower air outlet pipeline 7; the second end of the bypass flue 1 is communicated with an induced draft fan 10, and the induced draft fan 10 is communicated with a chimney 20 through a smoke exhaust pipeline 8.
A first flue baffle 11 is arranged at the communication position of the bypass flue 1 and the cloth bag outlet flue gas pipeline, a second flue baffle 12 is arranged on the GGH inlet pipeline 2, a third flue baffle 13 is arranged on the GGH outlet pipeline 3, a fourth flue baffle 14 is arranged on the SCR reaction tower inlet pipeline 6, a fifth flue baffle 15 is arranged on the SCR reaction tower outlet pipeline 7, and a sixth flue baffle 16 is arranged between the first gas outlet and the second gas inlet of the bypass flue 1. The entire flue damper can be opened or closed as desired.
The glass flake anticorrosive coatings are respectively and fixedly arranged on the inner cavity wall of the bypass flue 1, the inner cavity wall of the wet scrubber tower gas inlet pipeline 4, the inner cavity wall of the wet scrubber tower gas outlet pipeline 5, the inner cavity wall of the GGH gas outlet pipeline 3 and the inner cavity wall of the SCR reaction tower gas inlet pipeline 6 between the first flue baffle 11 and the sixth flue baffle 16.
Further, a high-temperature anti-corrosion paint layer is fixedly arranged on the inner cavity wall of the smoke exhaust pipeline 8.
Further, a high-temperature anti-corrosion paint layer is fixedly arranged on the inner cavity wall of the bypass flue 1 between the induced draft fan 10 and the sixth flue baffle 16.
Further, a high-temperature anti-corrosion paint layer is fixedly arranged on the inner cavity wall of the air outlet pipeline 7 of the SCR reaction tower.
In the actual construction, the utility model discloses a preparation step of glass scale anticorrosive coating is:
(I) surface treatment engineering
Solid layer treatment: carrying out surface treatment on the lining by shot blasting (sand blasting) to expose metallic luster, and meeting the following standard: shot blasting (sand blasting) of more than Sa2.5; after the shot blasting is completed, the compressed air is used to remove the adhering substances such as shot blasting (sand blasting) materials and rust.
Cleaning: the adhered shot blasting (sand blast) material, rust, oxides, grease, etc. are removed with a broom, a brush, a cotton, a dust collector, etc.
(II) sheet lining construction
And (3) priming coating: after shot blasting (sand blasting), the base coat is coated within 8 hours.
The sheets of layer 1 and layer 2 were separated, and air bubbles were removed by a squeegee so that the average thickness of the whole sheet became 2.0 mm. The thickness of the coating was verified with a wet film thickness gauge and, depending on the position, with the squeegee angle. And (4) checking whether construction is missed or not according to the different colors of the layer 1 and the layer 2.
And (4) checking: the lining is completed and after complete curing the following checks are performed. Visual inspection, film thickness inspection, and air hole inspection.
(III) coating a surface layer: after initial hardening of the 2 nd layer of the sheet, the top layer is applied with a brush or roller.
Note that:
if the inside of the flue equipment is provided with a support, the support also needs to be used for corrosion prevention of glass flakes, and novolac epoxy vinyl resin (180 ℃) is used.
And (II) phenolic epoxy vinyl resin (180 ℃) is used for laying pipe seats, manholes, support beams in the tower and the like to enhance the wear-resisting property.
(iii) does not allow welding of any kind of equipment after the lining is completed.
The glass flake anticorrosive coating fixedly arranged on the inner cavity of the partial pipeline of the flue gas flue system body is specially suitable for low-temperature corrosion. In actual operation, the flue gas in the flue gas pipeline at the outlet of the cloth bag comes from the cloth bag dust remover, the normal working condition of the flue gas is about 150 ℃, when the wet washing tower 30 works normally, the first flue baffle 11 is closed, the second flue baffle 12 and the third flue baffle 13 are opened, and the flue gas enters the first channel of the GGH through the GGH gas inlet pipeline 2 and the second flue baffle 12.
Two channels are arranged in the GGH shell, and a rotor filled with heat exchange elements is driven by a driving device to rotate slowly. The heat exchange element absorbs heat at the high-temperature flue gas side and releases heat at the low-temperature flue gas side, so that the heating process of the clean flue gas by the original flue gas is completed. GGH is a heat exchange device which utilizes the heat of high-temperature raw flue gas before desulfurization to heat the purified flue gas after desulfurization so as to improve the temperature of the purified flue gas. The improvement of the temperature of the purified flue gas after desulfurization reduces the harm of corrosive gas in the flue gas to a flue gas pipeline, along with the reduction of the original flue gas temperature, the improvement not only is beneficial to better absorption of sulfur dioxide in the wet-type washing tower 30, but also reduces the harm of high-temperature gas to corrosion-resistant materials or equipment in the absorption tower.
After entering a GGH first channel for heat exchange, flue gas enters a wet scrubber tower 30 through a wet scrubber tower gas inlet pipeline 4, and the problem of low-temperature corrosion of the flue gas is considered, so that fluoroplastic with excellent corrosion resistance is selected as a material for a heat exchanger at a system inlet of the wet scrubber tower 30, glass flake anticorrosive coating processes are adopted at an inlet section, a body and an outlet section of the wet scrubber tower 30, the purified flue gas is heated by a wet system heat exchanger GGH second channel and then enters a bypass flue 1 and an SCR reaction tower gas inlet pipeline 6 through a GGH gas outlet pipeline 3, the temperature of the flue gas is reduced to below 85 ℃, the temperature is lower than 110 ℃, the problem of low-temperature corrosion is easily caused, and therefore, glass flake anticorrosive coatings are fixedly arranged at corresponding parts of the GGH gas outlet pipeline 3 and the bypass flue 1 and on the inner cavity wall of the SCR reaction tower gas inlet pipeline 6. Then, the flue gas rises to about 170 ℃ in the SCR reaction tower assembly 9, the temperature is higher than 110 ℃, the flue gas is pumped into the induced draft fan 10 through the SCR reaction tower gas outlet pipeline 7 and a part of bypass flues, the induced draft fan 10 is communicated with a chimney 20 through a smoke exhaust pipeline 8 to be exhausted, at the moment, the sixth flue baffle 16 is closed, and the fourth flue baffle 14 and the fifth flue baffle 15 are opened. In addition, another GGH is also arranged in the SCR reaction tower assembly 9, and if the SCR reaction tower assembly fails and does not bypass, the SCR reaction tower assembly can also have negative influence on the catalyst, because the operating smoke temperature of the SCR system requires more than 170 ℃.
If one or both of the wet scrubber tower assembly and the SCR reaction tower assembly 9 are in fault, the wet scrubber tower 30 and the SCR reaction tower can be independently put into or bypass, when the second flue baffle plate 12 and the third flue baffle plate 13 are closed, the first flue baffle plate 11 is opened, and the flue gas does not enter the wet scrubber tower and directly enters the bypass flue 1; when the fourth flue baffle 14 and the fifth flue baffle 15 are closed and the sixth flue baffle 16 is opened, the flue gas does not enter the SCR reaction tower and directly enters the bypass flue 1, the inlet flue gas directly passes through the bypass flue 1 through the flue gas at the outlet of the cloth belt, and is directly sent into the induced draft fan 10 and is communicated with the chimney 20 through the smoke exhaust pipeline 8. Therefore, the smoke temperature is about 150 ℃, and the low-temperature corrosion rate is lower, so that the corrosion-resistant layer of the glass scale does not need to be made on the later section, and the section is changed into a high-temperature corrosion-resistant paint layer more suitable for the working condition for corrosion protection. Under the condition, when the system has a fault, the system can be disconnected for maintenance, if the system is put into operation on a main road, partial shutdown for maintenance cannot be carried out, the shutdown interval is lengthened, and the number of operating hours and the economical efficiency of the boiler are reduced.
The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connected mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt among the prior art, and conventional model, including the conventional connected mode among the circuit connection adoption prior art, and the details are not repeated here, and the content that does not make detailed description in this description belongs to the prior art that skilled person in the art knows.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (4)
1. A flue gas flue system with a low-temperature anticorrosion function for a waste incineration power plant is characterized by comprising a flue gas flue system body of the waste incineration power plant, a glass flake anticorrosion layer and a plurality of flue baffles;
the flue gas flue system body of the waste incineration power plant comprises a cloth bag outlet flue gas pipeline, a bypass flue, a GGH gas inlet pipeline, a GGH gas outlet pipeline, a wet type washing tower gas inlet pipeline, a wet type washing tower gas outlet pipeline, an SCR reaction tower gas inlet pipeline, an SCR reaction tower gas outlet pipeline and a smoke exhaust pipeline; the outlet end of the bag outlet flue gas pipeline is respectively communicated with a GGH inlet pipeline of the wet system heat exchanger and a first end of the bypass flue, the GGH inlet pipeline is connected with a first GGH channel, the first GGH channel is communicated with an inlet of a wet scrubber tower through an inlet pipeline of the wet scrubber tower, an outlet of the wet scrubber tower is communicated with a second GGH channel through an outlet pipeline of the wet scrubber tower, and the second GGH channel is communicated with a first inlet of the bypass flue through an outlet pipeline of the GGH; the SCR reaction tower assembly is communicated with a first air outlet of the bypass flue through an SCR reaction tower air inlet pipeline, and the SCR reaction tower assembly is communicated with a second air inlet of the bypass flue through an SCR reaction tower air outlet pipeline; the second end of the bypass flue is communicated with an induced draft fan which is communicated with a chimney through a smoke exhaust pipeline;
a first flue baffle is arranged at the communication position of the bypass flue and the bag outlet flue gas pipeline, a second flue baffle is arranged on the GGH inlet pipeline, a third flue baffle is arranged on the GGH outlet pipeline, a fourth flue baffle is arranged on the SCR reaction tower inlet pipeline, a fifth flue baffle is arranged on the SCR reaction tower outlet pipeline, and a sixth flue baffle is arranged between the first gas outlet and the second gas inlet of the bypass flue; the flue baffle can be opened or closed as required;
the glass flake anticorrosive layers are fixedly arranged on the inner cavity wall of the bypass flue, the inner cavity wall of the gas inlet pipeline of the wet scrubbing tower, the inner cavity wall of the gas outlet pipeline of the wet scrubbing tower, the inner cavity wall of the GGH gas outlet pipeline and the inner cavity wall of the gas inlet pipeline of the SCR reaction tower between the first flue baffle and the sixth flue baffle respectively.
2. The waste incineration power plant flue gas flue system with the low-temperature anticorrosion function as recited in claim 1, wherein a high-temperature anticorrosion paint layer is fixedly arranged on the inner cavity wall of the smoke exhaust pipeline.
3. The waste incineration power plant flue gas flue system with the low-temperature anticorrosion function as recited in claim 1, wherein a high-temperature anticorrosion paint layer is fixedly arranged on the inner cavity wall of the bypass flue between the induced draft fan and the sixth flue baffle.
4. The waste incineration power plant flue gas flue system with the low-temperature anticorrosion function as recited in claim 1, wherein a high-temperature anticorrosion paint layer is fixedly arranged on the inner cavity wall of the SCR reaction tower gas outlet pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222055615.7U CN218178930U (en) | 2022-08-05 | 2022-08-05 | Waste incineration power plant flue gas flue system with low-temperature corrosion prevention function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222055615.7U CN218178930U (en) | 2022-08-05 | 2022-08-05 | Waste incineration power plant flue gas flue system with low-temperature corrosion prevention function |
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| CN218178930U true CN218178930U (en) | 2022-12-30 |
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| CN202222055615.7U Active CN218178930U (en) | 2022-08-05 | 2022-08-05 | Waste incineration power plant flue gas flue system with low-temperature corrosion prevention function |
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