Anti-corrosion generator set low-temperature economizer
By using high-temperature sealant between the support plate and the pipeline of the low-temperature economizer and filling the insulation cotton between the support plate and the sealing plate, the pipeline corrosion problem caused by flue gas ash is solved, and the safe production and efficiency improvement of the generator set is achieved.
Patent Information
- Application Number
- CN202420749901.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-04-11
AI Technical Summary
During the operation of the existing low-temperature economizer, the ash in the flue gas, SO2, SO3 and other substances enter the space between the sealing plate and the support plate through the gap between the pipe and the support plate, resulting in air condensation and sulfuric acid forming, which in turn corrodes the pipeline and affects the safe production of the generator set.
High-temperature sealant is installed between the support plate and the pipeline to ensure the sealing property between the support plate and the pipeline, and thermal insulation cotton is filled between the support plate and the sealing plate to prevent air condensation, thus forming a double protection measure to prevent corrosion.
It effectively prevents flue gas ash from entering the space between the sealing plate and the support plate, avoids low-temperature corrosion of the pipeline, ensures safe production of the generator set, and improves power generation efficiency.
Smart Images
Figure CN222773329U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field related to waste heat recovery, and in particular to a corrosion-resistant low-temperature economizer for a generator set. Background Art
[0002] Low-temperature economizer is a heat exchange device used in the boiler of coal-fired power generation units. It is installed at the bottom of the flue at the tail of the boiler to recover the waste heat of the exhaust gas. Condensate flows in the pipe of the low-temperature economizer, and flue gas flows outside the pipe, realizing the heat exchange between flue gas and condensate. The exhaust gas of the boiler of the coal-fired power generation unit enters the low-temperature economizer through the flue, enters the dust collector after being cooled by the low-temperature economizer, and then is discharged through the chimney through the induced draft fan. The heat released by the flue gas after being cooled by the low-temperature economizer is used to increase the condensate temperature of the main engine; reduce the exhaust temperature, thereby improving the efficiency of the generator set and achieving the goal of energy saving, environmental protection and green production.
[0003] The existing low-temperature economizer has its pipeline fixed on the support plate of the low-temperature economizer. During the operation of the low-temperature economizer pipeline, the water temperature in the low-temperature economizer pipeline changes frequently due to the constant change of the load of the coal-fired power generation unit. There needs to be a 1mm gap between the pipeline and the support plate to ensure that the pipeline can expand freely in the horizontal direction. Flue gas flows continuously outside the pipeline of the low-temperature economizer, and the flue gas temperature is 110℃. The flue gas of the coal-fired power generation unit contains ash, and the ash contains SO2 and SO3. There is a sealing plate on the side of the support plate, and there is a pipe bend in the space between the sealing plate and the support plate, and there is no flue gas flowing between the sealing plate and the support plate. Since there needs to be a 1mm gap between the pipeline and the support plate, the ash of the flue gas will flow into the space between the sealing plate and the support plate through this gap. In addition, since there is no flue gas flowing in the space between the sealing plate and the support plate, the temperature will be lower than 100℃, causing condensation of air between the sealing plate and the support plate. After condensation, sulfuric acid is formed with SO2 and SO3 in the ash, corroding the bend of the low-temperature economizer, causing low-temperature corrosion leakage, affecting the safe production of the coal-fired power generation unit. Utility Model Content
[0004] The purpose of the utility model is to overcome the above-mentioned problems and provide a corrosion-resistant low-temperature economizer for a power generation unit; the low-temperature economizer can effectively prevent ash from entering the space between the sealing plate and the support plate, thereby preventing the elbow of the low-temperature economizer from corrosion, thereby ensuring the safe production of the coal-fired power generation unit.
[0005] The purpose of the utility model is achieved through the following technical solutions:
[0006] A corrosion-resistant low-temperature economizer for a generator set comprises a box body, a pipe arranged inside the box body for heat exchange, and support plates arranged on both sides of the box body for installing the pipe; wherein the channel formed between the two support plates is a flue gas channel for conveying flue gas; the two sides of the box body are sealing plates, and high-temperature sealant for sealing is provided between the support plates and the pipes.
[0007] The working principle of the above-mentioned corrosion-resistant low-temperature economizer of the generator set is:
[0008] A high-temperature sealant is provided between the support plate and the pipeline. The high-temperature sealant is resistant to high temperatures and has certain flexibility. It does not affect the expansion of the pipeline, thereby ensuring the sealing reliability between the support plate and the pipeline and effectively preventing the ash of the flue gas in the channel from flowing into the space between the support plate and the sealing plate, thereby preventing the pipe bend from corroding and ensuring the safe production of the coal-fired power generation unit. The exhaust gas from the boiler of the coal-fired power generation unit enters the channel of the low-temperature economizer through the flue, and the temperature of the flue gas is reduced through heat exchange in the pipeline.
[0009] A preferred solution of the utility model, wherein the space between the support plate and the sealing plate is filled with thermal insulation cotton. In the above structure, the thermal insulation cotton can ensure that the temperature of the space between the support plate and the sealing plate will not be lower than 100°C, avoiding air condensation in the space between the support plate and the sealing plate, further reducing low-temperature corrosion of the pipeline, and with high-temperature sealant, it has a dual protection effect.
[0010] Preferably, the sealing plate is made of aluminum, which is convenient for inspection and maintenance and has a rainproof effect, further reducing the risk of corrosion of the low-temperature economizer.
[0011] Preferably, the pipeline is a serpentine coil, which includes a plurality of straight pipes and a plurality of curved pipes that are alternately adjacent to each other in sequence; the straight pipe is located in the channel, and the curved pipe is located in the space between the support plate and the sealing plate. The purpose is to improve the efficiency of heat exchange; the space between the support plate and the sealing plate is filled with thermal insulation cotton, that is, the curved pipe is wrapped with thermal insulation cotton, which avoids air condensation in the space between the support plate and the sealing plate, thereby preventing low-temperature corrosion of the curved pipe; filling the space between the support plate and the sealing plate with thermal insulation cotton can prevent the curved pipe from cooling down, reduce heat loss, and further improve the efficiency of the coal-fired generator set.
[0012] Preferably, the support plate is provided with a plurality of mounting holes for the pipe to pass through, and there is a gap between the mounting hole and the pipe, and the gap is filled with high-temperature sealant. The gap is provided to ensure that the pipe can expand freely, and under the action of the high-temperature sealant, the expansion of the pipe is not affected, and a sealing effect can be achieved.
[0013] Preferably, a water inlet manifold and a water return manifold are provided in the box body, a water inlet pipe is provided on the water inlet of the water inlet manifold, and a water return pipe is provided on the water outlet of the water return manifold; the water inlet of the pipe is connected with the water outlet of the water inlet manifold; the water outlet of the pipe is connected with the water inlet of the water return manifold. Condensate enters the water inlet manifold from the water inlet pipe, then enters the pipe, enters the water return manifold after heat exchange in the flue gas channel, and finally flows out from the water return pipe.
[0014] Preferably, the number of the pipelines is multiple, the number of the water outlets of the water inlet manifold and the water inlet of the water return manifold is the same as the number of the pipelines, the water inlets of the pipelines are arranged in one-to-one correspondence with the water outlets of the water inlet manifold, and the water outlets of the pipelines are arranged in one-to-one correspondence with the water inlet of the water return manifold. The purpose is to improve the heat exchange efficiency, and by setting the water inlet manifold and the water return manifold, it is ensured that each pipeline has sufficient condensed water for heat exchange.
[0015] Compared with the prior art, the utility model has the following beneficial effects:
[0016] 1. In the low-temperature economizer of the generator set of the utility model, a high-temperature sealant is provided between the support plate and the pipeline. The high-temperature sealant not only does not affect the expansion of the pipeline, but also makes the seal between the support plate and the pipeline reliable, effectively preventing the ash of the flue gas in the channel from flowing into the space between the support plate and the sealing plate, thereby preventing the corrosion of the elbow of the pipeline and ensuring the safe production of the coal-fired generator set.
[0017] 2. The low-temperature economizer of the generator set in the utility model has a high-temperature sealant with airtightness, and the ash of the flue gas will not flow into the space between the support plate and the sealing plate. Even if the air between the support plate and the sealing plate condenses, it will not form sulfuric acid with SO2 and SO3 in the ash, thereby preventing corrosion to the elbow of the low-temperature economizer. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of one specific implementation mode of a corrosion-resistant low-temperature economizer for a power generation unit in the utility model.
[0019] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.
[0020] Figure 3 It is a schematic diagram of the installation structure of the pipeline, the water inlet header, the water return header, the water inlet pipe and the water return pipe in the utility model. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described below in conjunction with embodiments and drawings, but the implementation methods of the utility model are not limited thereto.
[0022] See also Figure 1 and Figure 2 The present embodiment discloses a corrosion-resistant low-temperature economizer for a power generation unit, comprising a box body 1, a pipe 2 for heat exchange arranged inside the box body 1, and support plates 3 arranged on both sides of the box body 1 for installing the pipe 2; wherein, a channel formed between the two support plates 3 is a flue gas channel 4 for conveying flue gas; sealing plates 5 are provided on both sides of the box body 1, and a high-temperature sealant 6 for sealing is provided between the support plate 3 and the pipe 2.
[0023] See also Figure 1 and Figure 2 The space between the support plate 3 and the sealing plate 5 is filled with thermal insulation cotton 7. In the above structure, the thermal insulation cotton 7 can ensure that the temperature of the space between the support plate 3 and the sealing plate 5 will not be lower than 100°C, avoiding air condensation in the space between the support plate 3 and the sealing plate 5, further reducing the low-temperature corrosion of the pipeline 2, and with the high-temperature sealant 6, it has a dual protection effect.
[0024] See also Figure 1 and Figure 2 The thickness of the thermal insulation cotton 7 is 200 mm.
[0025] See also Figure 1 and Figure 2 The sealing plate 5 is made of aluminum. The aluminum sheet is provided to facilitate inspection and maintenance, and has a rainproof effect, further reducing the corrosion risk of the low-temperature economizer.
[0026] See also Figure 1-Figure 3 The pipeline 2 is a serpentine coil, and the pipeline 2 includes a plurality of straight pipes 2-1 and a plurality of curved pipes 2-2 that are alternately adjacent to each other in sequence; the straight pipe 2-1 is located in the channel, and the curved pipe 2-2 is located in the space between the support plate 3 and the sealing plate 5. The purpose is to improve the efficiency of heat exchange; the space between the support plate 3 and the sealing plate 5 is filled with thermal insulation cotton 7, that is, the curved pipe 2-2 is wrapped with the thermal insulation cotton 7, which avoids air condensation in the space between the support plate 3 and the sealing plate 5, thereby preventing the curved pipe 2-2 from low-temperature corrosion; the space between the support plate 3 and the sealing plate 5 is filled with thermal insulation cotton 7 to prevent the curved pipe 2-2 from cooling down, reduce heat loss, and further improve the efficiency of the coal-fired power generation unit.
[0027] See also Figure 1-Figure 2The support plate 3 is provided with a plurality of mounting holes for the pipe 2 to pass through, and there is a gap between the mounting hole and the pipe 2, and the gap is filled with high-temperature sealant 6. The gap is provided to ensure that the pipe 2 can expand freely, and under the action of the high-temperature sealant 6, the expansion of the pipe 2 is not affected, and a sealing effect can be achieved.
[0028] See also Figure 1-Figure 2 The high temperature sealant 6 is directly applied to the gap between the support plate 3 and the pipe 2 . Before applying the high temperature sealant 6 , the support plate 3 needs to be sandblasted and derusted to improve the air tightness of the high temperature sealant 6 .
[0029] See also Figure 1 and Figure 3 The box body 1 is provided with an inlet header 8 and a return header 9, the inlet of the inlet header 8 is provided with an inlet pipe 10, and the outlet of the return header 9 is provided with a return pipe 11; the inlet of the pipeline 2 is connected with the outlet of the inlet header 8; the outlet of the pipeline 2 is connected with the inlet of the return header 9. Condensate enters the inlet header 8 from the inlet pipe 10, then enters the pipeline 2, enters the return header 9 after heat exchange in the flue gas channel 4, and finally flows out from the return pipe 11.
[0030] The water inlet of the pipeline 2 and the water outlet of the water inlet manifold 8 , as well as the water outlet of the pipeline 2 and the water inlet of the return water manifold 9 are connected via a transition pipe, and the transition pipe passes through the thermal insulation cotton 7 .
[0031] See also Figure 1 and Figure 3 The number of the pipelines 2 is multiple, the number of the water outlets of the water inlet header 8 and the water inlet of the water return header 9 is the same as the number of the pipelines 2, the water inlets of the pipelines 2 are arranged in one-to-one correspondence with the water outlets of the water inlet header 8, and the water outlets of the pipelines 2 are arranged in one-to-one correspondence with the water inlet of the water return header 9. The purpose is to improve the heat exchange efficiency, and by setting the water inlet header 8 and the water return header 9, it is ensured that each pipeline 2 has sufficient condensed water for heat exchange.
[0032] See also Figure 1-Figure 2 The working principle of the above-mentioned corrosion-resistant low-temperature economizer of the generator set is:
[0033] A high-temperature sealant 6 is provided between the support plate 3 and the pipeline 2. The high-temperature sealant 6 has high-temperature resistance and certain flexibility, does not affect the expansion of the pipeline 2, ensures the sealing reliability between the support plate 3 and the pipeline 2, and effectively prevents the ash of the flue gas in the channel from flowing into the space between the support plate 3 and the sealing plate 5, thereby preventing the elbow 2-2 of the pipeline 2 from corrosion, ensuring the safe production of the coal-fired power generation unit; the exhaust gas of the boiler of the coal-fired power generation unit enters the channel of the low-temperature economizer from the flue, and reduces the temperature of the flue gas through the heat exchange of the pipeline 2.
[0034] The above is a preferred implementation mode of the present invention, but the implementation mode of the present invention is not limited by the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A corrosion-resistant low-temperature economizer for a power generation unit, comprising a box, a pipe arranged inside the box for heat exchange, and support plates arranged on both sides of the box for mounting the pipe; characterized in that: The channel formed between the two support plates is a smoke channel for conveying smoke; the two sides of the box body are sealing plates, and high-temperature sealant for sealing is provided between the support plates and the pipeline.
2. The corrosion-resistant low-temperature economizer for a power generation unit according to claim 1, characterized in that: The space between the support plate and the sealing plate is filled with thermal insulation cotton.
3. The corrosion-resistant low-temperature economizer for a power generation unit according to claim 1, characterized in that: The sealing plate is made of aluminum.
4. The corrosion-resistant low-temperature economizer for a power generation unit according to claim 1, characterized in that: The pipeline is a serpentine coil, which includes a plurality of straight pipes and a plurality of curved pipes that are alternately adjacent to each other in sequence; the straight pipes are located in the channel, and the curved pipes are located in the space between the support plate and the sealing plate.
5. The corrosion-resistant low-temperature economizer of a power generation unit according to claim 1, 2 or 4, characterized in that: The support plate is provided with a plurality of mounting holes for the pipeline to pass through, and there is a gap between the mounting holes and the pipeline, and the gap is filled with high-temperature sealant.
6. The corrosion-resistant low-temperature economizer for a power generation unit according to claim 1, characterized in that: A water inlet manifold and a water return manifold are provided in the box body, a water inlet pipe is provided on the water inlet of the water inlet manifold, and a water return pipe is provided on the water outlet of the return water manifold; the water inlet of the pipe is connected with the water outlet of the water inlet manifold; the water outlet of the pipe is connected with the water inlet of the return water manifold.
7. The corrosion-resistant low-temperature economizer for a power generation unit according to claim 6, characterized in that: There are multiple pipes, the number of the water outlets of the water inlet manifold and the water inlet of the return water manifold is the same as the number of the pipes, the water inlets of the pipes are arranged in a one-to-one correspondence with the water outlets of the water inlet manifold, and the water outlets of the pipes are arranged in a one-to-one correspondence with the water inlets of the return water manifold.