Flue gas condensate water collecting device

Abstract

The utility model relates to the technical field of waste heat utilization, in particular to a flue gas condensate water collecting device which comprises a shell, the interior of the shell is hollow to form a flue, the flue extends to the two ends of the shell, and flue gas flows from the interior of the flue. The flow guide baffles are distributed in the flue in an array mode, the flow guide baffles are arranged in an inclined mode, the lower ends of the flow guide baffles extend to the position above the collecting groove, and the collecting groove is used for collecting condensate water on the flow guide baffles. According to the collecting device, on one hand, liquid water separated out through condensation in smoke is recycled, the problem that smoke condensate water corrodes a flue and a heating surface of a waste heat boiler can be effectively solved, on the other hand, the collecting device has a flow equalizing effect on the smoke entering the heat exchanger, and a smoke flow field is stabilized.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology, specifically a flue gas condensate collection device. Background Technology

[0002] Traditional boiler systems, designed to prevent low-temperature corrosion due to dew point temperatures, typically have high flue gas temperatures, generally around 150°C. However, this design leads to significant heat loss, especially the latent heat of steam. Studies show that 1m 3 The flue gas combustion produces approximately 2.11m³ of gas. 3 The water vapor produced is equivalent to 1.69 kg of water, and the heat released upon condensation is approximately 3800 kJ, accounting for about 10% of the fuel value of natural gas. Therefore, by reducing the flue gas temperature and recovering this heat, energy utilization efficiency can be significantly improved.

[0003] By installing a waste heat exchanger in the tail flue of a gas turbine unit, the heat from the flue gas in the tail flue can be fully collected. Currently, the mainstream utilization method is to use the waste heat from the flue gas of a gas-steam combined cycle unit to participate in heating. The medium parameters at the outlet of the waste heat exchanger meet the heating requirements, which can increase the heating area of ​​the gas turbine unit under the same load.

[0004] my country currently has higher requirements for energy efficiency and environmental protection. In order to make full use of flue gas waste heat, a large number of gas turbine vertical boilers have installed flue gas waste heat exchangers at the tail chimney. The flue gas waste heat exchanger will reduce the flue gas temperature to below the water dew point. The heating surface of the waste heat boiler is located below the flue gas waste heat exchanger. If the flue gas condensate is not collected, the condensate will drip onto the heating surface of the waste heat boiler, affecting the service life of the heating surface of the waste heat boiler. Utility Model Content

[0005] The purpose of this invention is to provide a flue gas condensate collection device to solve the problems mentioned in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flue gas condensate collection device, comprising a flue, a heating surface, and a flue gas waste heat exchanger placed inside the flue. After passing through the heating surface, the flue gas flows from inside the flue to the flue gas waste heat exchanger. The device also includes a guide member for guiding the water flow direction and a water collection section for collecting water, located between the flue gas waste heat exchanger and the heating surface.

[0007] Furthermore, the projection surface of at least one of the guide members covers the cross-section of the flue.

[0008] Furthermore, the guide element is inclined.

[0009] Furthermore, the flow guide is a flow guide baffle, which guides the water to the water collection section for collection.

[0010] Furthermore, the water collection section is a collection trough with an opening at the top.

[0011] Furthermore, a splash guard is inclined above the water collection section, and the projected surface of the splash guard coincides with the top opening of the water collection section.

[0012] Furthermore, the sidewall of the collection tank extends upward to form the collection tank wall.

[0013] Furthermore, the hydrophobic capacity of the collection tank is 0.5 * π * R. 2 *Flue width + 2*R*H*Flue width; where R is the radius of the collection trough, H is the height of the collection trough wall, and * is the multiplication sign.

[0014] Furthermore, it also includes a drainage collection pipe, one end of which extends into the flue and connects to one end of the collection tank. The drainage collection pipe has an inclination angle γ with the horizontal direction, and the inclination angle γ ranges from 3° to 5°.

[0015] Furthermore, the drainage collection pipe is connected to the horizontal section of the drainage collection main pipe, and the horizontal section of the drainage collection main pipe is connected to the vertical section of the drainage collection main pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The collection device of the present invention recovers the liquid water condensed in the flue gas, which can effectively solve the problem of flue gas condensate corroding the flue and the heating surface of the waste heat boiler. On the other hand, it has a flow equalization effect on the flue gas entering the heat exchanger section, stabilizing the flue gas flow field. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the front cross-sectional structure of the flue of this utility model;

[0019] Figure 2 This is a schematic diagram of the front cross-sectional structure of the flow guide baffle of this utility model;

[0020] Figure 3 This is a front view schematic diagram showing the distribution of the horizontal and vertical sections of the hydrophobic collection main pipe of this utility model.

[0021] Figure 4 This is a side view of the hydrophobic collection pipe of this utility model.

[0022] Figure 5 This is a top view of the hydrophobic collection pipe of this utility model.

[0023] In the diagram: 1. Shell; 2. Heating surface; 3. Flue gas waste heat exchanger; 4. Baffle; 5. Splash baffle; 6. Collection tank wall; 7. Collection tank; 8. Flue; 9. Drainage collection pipe; 10. Horizontal section of drainage collection header; 11. Vertical section of drainage collection header; ↓ indicates the direction of condensate dripping; ↑ indicates the direction of flue gas flow. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: Figures 1-2 As shown, this utility model provides a flue gas condensate collection device, including a housing 1, the interior of which is hollow to form a flue 8, the flue 8 extending to both ends of the housing 1, and flue gas flowing from inside the flue 8;

[0026] The flue includes a flow guide baffle 4 and a collection trough 7. The flow guide baffle 4 is arranged in an array inside the flue and is inclined. The lower end of the flow guide baffle 4 extends above the collection trough 7, which is used to collect condensate on the flow guide baffle 4.

[0027] It also includes a splash guard 5, which is inclinedly disposed above the collection tank 7, and the projection surface of the splash guard 5 coincides with the collection tank 7.

[0028] Specifically, the splash guard 5 makes an angle α with the vertical direction, and the guide baffle 4 makes an angle β with the vertical direction. The angle α is determined based on the potential energy and properties of the actual liquid water droplets, and the angle β is determined based on the actual flue size and flue gas parameters.

[0029] The length S of the splash guard 5 is determined based on the potential energy and properties of the actual liquid water droplets falling.

[0030] The top of the collection tank 7 is open, and a collection tank wall 6 is provided on the outside of the opening.

[0031] The hydrophobic capacity of the collection tank 7 is 0.5 * π * R. 2 *Flue width + 2*R*H*Flue width; where R is the radius of the collection tank 7, H is the height of the collection tank wall 6, and * is the multiplication sign.

[0032] Specifically, a water collection device module consists of guide baffles, collection tank walls, collection tanks, and splash guards used in conjunction with each other. Multiple layers of these modules are arrayed within the flue. The number of modules per layer is determined by the actual flue dimensions, and the number of layers depends on the flue resistance and water collection requirements. More layers result in greater flue resistance, and higher water collection requirements necessitate more layers; generally, two to three layers are used. The upper end of the guide baffle of the lower layer connects to the bottom of the collection tank of the upper layer, forming a flue gas flow channel.

[0033] The length of the baffle plate 4 is L, which is determined according to the actual flue size and the spacing of the water collection device modules. The number of water collection device modules per layer is rounded down according to the length L of the baffle plate 4.

[0034] The water collection device is made entirely of corrosion-resistant materials, which are not easily corroded by impurities in liquid water and can extend the service life of the water collection device. The selected material should be chosen according to the water quality of the collected water and the specific working environment and application. It can be 304 stainless steel, 316L stainless steel, or corrosion-resistant plastic material.

[0035] It also includes a flue gas waste heat exchanger 3, which is located at the output end of the flue gas flow in the flue duct 8, and vertically, the flue gas waste heat exchanger 3 is positioned above the guide baffle 4; it also includes a heating surface 2, which is located at the input end of the flue gas flow in the flue duct 8, and vertically, the heating surface 2 is positioned below the guide baffle 4; and it also includes a condensate collection pipe 9, one end of which extends into the flue duct 8 and connects to one end of the collection tank 7. Specifically, the flue gas waste heat exchanger is arranged below the chimney, and the water collection device is arranged directly below the flue gas waste heat exchanger and directly above the heating surface.

[0036] like Figures 4-5 As shown, the condensate collection pipe 9 has an inclination angle γ with the horizontal direction to facilitate the outflow of condensate from the collection tank 7. The value of γ is related to the actual amount of condensate from the flue gas of the heat exchanger. The larger the amount of water, the larger the value of γ. The inclination angle γ ranges from 3° to 5°.

[0037] like Figure 3 As shown, the drainage collection pipe 9 is connected to the horizontal section 10 of the drainage collection main pipe, and the horizontal section 10 of the drainage collection main pipe is connected to the vertical section 11 of the drainage collection main pipe.

[0038] Working principle: Flue gas enters the flue gas waste heat exchanger from bottom to top in the flue. The moisture in the flue gas is below the saturation temperature of water and precipitates out as liquid water. Under the action of gravity, it splashes onto the guide baffle of the water collection device. Under the combined action of the guide baffle and the anti-splash baffle, it finally flows into the collection tank. The liquid water in the collection tank will be led out by the drainage pipe on the horizontal side.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A flue gas condensate collection device, comprising a flue, a heating surface, and a flue gas waste heat exchanger disposed inside the flue, wherein flue gas flows from inside the flue to the flue gas waste heat exchanger after passing through the heating surface, characterized in that: It also includes a guide for guiding water flow and a water collection section located between the flue gas waste heat exchanger and the heating surface.

2. The flue gas condensate collection device according to claim 1, characterized in that: The projection surface of at least one of the guide members covers the cross-section of the flue.

3. The flue gas condensate collection device according to claim 1, characterized in that: The flow guide is set at an angle.

4. The flue gas condensate collection device according to claim 3, characterized in that: The flow guide is a flow guide baffle, which guides the water to the water collection section for collection.

5. A flue gas condensate collection device according to any one of claims 1-4, characterized in that: The water collection section is a collection tank with an opening at the top.

6. The flue gas condensate collection device according to claim 5, characterized in that: An anti-splash baffle is inclined above the water collection section, and the projected surface of the anti-splash baffle coincides with the top opening of the water collection section.

7. A flue gas condensate collection device according to claim 5, characterized in that: The sidewall of the collection tank extends upward to form the collection tank wall.

8. The flue gas condensate collection device according to claim 7, characterized in that: The hydrophobic capacity of the collection tank is 0.5 * π * R. 2 *Flue width + 2*R*H*Flue width; where R is the radius of the collection trough, H is the height of the collection trough wall, and * is the multiplication sign.

9. A flue gas condensate collection device according to claim 8, characterized in that: It also includes a drainage collection pipe, one end of which extends into the flue and connects to one end of the collection tank. The drainage collection pipe has an inclination angle γ with the horizontal direction, and the inclination angle γ ranges from 3° to 5°.

10. A flue gas condensate collection device according to claim 9, characterized in that: The drainage collection pipe is connected to the horizontal section of the drainage collection main pipe, and the horizontal section of the drainage collection main pipe is connected to the vertical section of the drainage collection main pipe.

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