Waste heat recovery steam generator based on vertical cross-flow structure

Abstract

The utility model belongs to the field of boiler equipment, and discloses a waste heat recovery steam generator based on a vertical cross-flow structure, which comprises a burner, a feeding device, a waste heat recovery device, a high-temperature water supply device and a flue gas condensed water discharge device, the waste heat recovery device comprises a box body and a cold water pipe set, a first smoke inlet and a first smoke outlet are formed in the two opposite side walls of the box body respectively, the first smoke outlet is connected with the smoke condensate water discharging device, and the first smoke inlet is directly connected with the side wall of the combustor. The flowing direction of the flue gas in the box body is vertical to the flowing direction of the cold water; the high-temperature water supply device comprises a high-temperature water outlet pipeline connected with the water outlet end of the cold water pipe set, and a water outlet of the high-temperature water outlet pipeline is connected with a water inlet of the combustor. According to the utility model, high-temperature flue gas can be recycled, energy conservation and consumption reduction are realized, and the steam generation time is shortened; the utility model is suitable for industrial or civil fields and the like, and is used for providing steam or hot water for generator sets, heating systems or industrial processes.

Description

Technical Field

[0001] This utility model belongs to the field of boiler equipment, specifically a waste heat recovery steam generator based on a vertical cross-flow structure. Background Technology

[0002] Combustion devices, such as boilers, are widely used in industrial production to heat water to a set temperature by burning fuel to produce steam or hot water. Heating cold water to a set temperature requires a fixed amount of fuel and a certain amount of time to produce steam.

[0003] After fuel combustion, boilers generate a large amount of high-temperature flue gas, which is often directly released into the atmosphere, wasting this waste heat. Recovering and utilizing this high-temperature flue gas could reduce fuel consumption and shorten steam generation time. Therefore, how to recover and utilize the waste heat from high-temperature flue gas to achieve energy conservation and reduced consumption in combustion devices and shorten steam generation time has become crucial for industrial production. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention aims to provide a waste heat recovery steam generator based on a vertical cross-flow structure, thereby achieving the goal of recovering and utilizing high-temperature flue gas, reducing energy consumption and shortening steam generation time in the combustion device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A waste heat recovery steam generator with a vertical cross-flow structure includes a burner, a feeding device, a waste heat recovery device, a high-temperature water supply device, and a flue gas condensate discharge device.

[0007] The feeding device includes a feeding pipe and a fan and an air filter installed on the feeding pipe. The output end of the feeding pipe is connected to the burner inlet.

[0008] The waste heat recovery device includes a cold water inlet pipe and a housing, as well as a cold water pipe assembly connected to the cold water inlet pipe and installed inside the housing. A first flue gas inlet and a first flue gas outlet are respectively provided on two opposite side walls of the housing. The first flue gas outlet is connected to a flue gas condensate discharge device. A second flue gas outlet is provided on the side wall of the burner and is directly connected to the first flue gas inlet. The flow direction of the flue gas in the housing is perpendicular to the flow direction of the cold water, forming a countercurrent heat exchange.

[0009] The flue gas condensate discharge device is equipped with a condensate outlet and a third flue gas outlet for discharging low-temperature flue gas.

[0010] The high-temperature water supply device includes a high-temperature water outlet pipeline connected to the outlet end of the cold water pipeline group. A buffer tank and a vertical multistage pump are sequentially installed on the high-temperature water outlet pipeline along the water flow direction. The outlet of the high-temperature water outlet pipeline is connected to the inlet of the burner.

[0011] As a limitation of this utility model: on the horizontal projection plane, the fan is located on the side of the burner, and the horizontal projection area of ​​the fan is independent of the horizontal projection area of ​​the burner.

[0012] As another limitation of this utility model: the inner wall of the cold water pipe assembly is coated with a corrosion-resistant and high-temperature-resistant coating.

[0013] As a further limitation of this utility model: the cold water pipe assembly is made of stainless steel.

[0014] As a further limitation of this utility model: a drain pipe branches off from the cold water inlet pipe, and a valve is installed on the drain pipe.

[0015] As another limitation of this utility model: a flow meter, a pressure gauge and a thermometer are sequentially installed along the water flow direction on the high-temperature water outlet pipeline located between the vertical multistage pump and the burner.

[0016] As a further limitation of this utility model, it also includes a base, and the burner, waste heat recovery device, high-temperature water supply device, and flue gas condensate discharge device are all assembled on the base.

[0017] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0018] (1) This utility model includes a burner, a feeding device, a waste heat recovery device, a high-temperature water supply device, and a flue gas condensate discharge device. The feeding device feeds fuel into the burner, which generates high-temperature flue gas after combustion. Under the blowing force of the fan and the natural suction of the flue gas condensate discharge device, the high-temperature flue gas enters the waste heat recovery device and exchanges heat with cold water. The low-temperature flue gas and condensate after heat exchange are discharged from the flue gas condensate discharge device, and the high-temperature water after heat exchange enters the burner for reuse through the high-temperature water supply device. Compared with the burner heating cold water to hot water or steam, the water entering the burner in this device has a certain temperature, which can reduce fuel consumption, achieve energy saving and consumption reduction, and also shorten the steam generation time.

[0019] (2) In this utility model, the waste heat recovery device is set on the side wall of the burner. Compared with setting it on the top of the burner, this device can reduce the overall height and facilitate transportation. In addition, the second flue gas outlet on the side wall of the burner is directly connected to the first flue gas inlet of the waste heat recovery device, avoiding the problem of heat loss of high temperature flue gas in the pipe due to the connection through the pipe.

[0020] (3) On the horizontal projection plane, the fan is located on the side of the burner, and the horizontal projection area of ​​the fan is independent of the horizontal projection area of ​​the burner. This arrangement allows the fan to avoid the high-temperature area directly above the burner, thus protecting the electrical components.

[0021] In summary, this invention enables the recovery and utilization of high-temperature flue gas, achieving energy conservation and consumption reduction, and shortening the steam generation time. This invention is applicable to industrial or civil fields, and can be used to provide steam or hot water for generator sets, heating systems, or industrial processes. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0024] Figure 2 This is an exploded view of an embodiment of the present invention (base not shown);

[0025] Figure 3 This is a schematic diagram of the waste heat recovery device and the high-temperature water outlet pipeline in the embodiments of this utility model;

[0026] Figure 4 This is a top view of an embodiment of the present utility model.

[0027] Figure 5 This is a three-dimensional structural diagram of an embodiment of the present invention from another perspective (the base is not shown).

[0028] In the diagram: 1-burner, 11-feed inlet, 12-second flue gas outlet, 13-water inlet;

[0029] 2-Feeding device, 21-Feeding pipe, 22-Fan, 23-Air filter, 24-Gas pipeline;

[0030] 3-Waste heat recovery device, 31-Cold water inlet pipe, 32-Box, 33-Cold water pipe assembly, 34-First flue gas inlet, 35-First flue gas outlet, 36-Drainage pipe, 37-Valve, 38-Water outlet;

[0031] 4-High temperature water supply device, 41-High temperature water outlet pipeline, 42-Buffer tank, 43-Vertical multistage pump, 44-Flow meter, 45-Pressure gauge, 46-Thermometer, 47-Outlet pipe;

[0032] 5-Flue gas condensate discharge device, 51-Condensate outlet, 52-Third flue gas outlet;

[0033] 6-Base. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and do not constitute a limitation thereof.

[0035] The directional terms or positional relationships such as "up," "down," "front," and "back" used in the embodiments are based on the drawings in this utility model specification. Figure 2 The orientation relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.

[0036] like Figures 1-5 As shown, this embodiment includes a burner 1, a feeding device 2, a waste heat recovery device 3, a high-temperature water supply device 4, and a flue gas condensate discharge device 5. The feeding device 2 feeds fuel into the burner 1 for combustion. The high-temperature flue gas generated after combustion enters the waste heat recovery device 3 for recycling, exchanging heat with the cold water in the waste heat recovery device 3. The low-temperature flue gas and condensate after heat exchange are discharged from the flue gas condensate discharge device 5, while the high-temperature water enters the burner 1 via the high-temperature water supply device 4 for utilization. Compared to directly heating cold water in the burner 1, this device reduces fuel consumption, shortens steam generation time, and effectively utilizes the high-temperature flue gas.

[0037] 1. Feeding device 2;

[0038] like Figure 1 As shown, the feeding device 2 includes a feeding pipe 21, a fan 22, and an air filter 23 mounted on the feeding pipe 21. The output end of the feeding pipe 21 is connected to the inlet 11 of the burner 1. In use, natural gas enters through the gas pipeline 24, and air is drawn in by the fan 22. The air and natural gas are mixed and then fed into the burner 1 through the feeding pipe 21. The feeding pipe 21, fan 22, and air filter 23 are all existing technologies; the difference lies in the location of the fan 22, which differs from existing technologies. Figure 4 As shown, in the horizontal projection plane of this application, the fan 22 is located on the side of the burner 1, and the horizontal projection area of ​​the fan 22 is independent of the horizontal projection area of ​​the burner 1. This arrangement allows the fan 22 to avoid the high-temperature area directly above the burner 1, thus protecting the electrical components.

[0039] II. Waste heat recovery device 3. Flue gas condensate discharge device 5;

[0040] like Figure 1-3As shown in Figure 5, the waste heat recovery device 3 includes a cold water inlet pipe 31, a housing 32, and a cold water pipe assembly 33 connected to the cold water inlet pipe 31 and disposed within the housing 32. The cold water pipe assembly 33 includes finned tubes located inside the housing 32 and elbows located outside the housing 32 for connecting two finned tubes. The structure of the cold water pipe assembly 33 adopts existing technology and will not be described in detail in this embodiment.

[0041] The housing 32 has a first flue gas inlet 34 and a first flue gas outlet 35 on its two opposite side walls, and a second flue gas outlet 12 directly connected to the first flue gas inlet 34 is provided on the side wall of the burner 1. In this embodiment, the front and rear side walls of the housing 32 are open structures, with the entire front side wall serving as the first flue gas outlet 35 and the entire rear side wall serving as the first flue gas inlet 34. The flow direction of the high-temperature flue gas in the housing 32 is perpendicular to the flow direction of the cold water, forming a counter-current heat exchange. Specifically, in this device, the high-temperature flue gas enters the housing 32 from the second flue gas outlet 12 and flows from back to front within the housing 32, while the cold water flows in the cold water pipe assembly 33 in an up-down direction, forming a counter-current heat exchange. After heat exchange, the temperature of the cold water in the cold water pipe assembly 33 rises, while the temperature of the high-temperature flue gas decreases. The first smoke outlet 35 is connected to the flue gas condensate discharge device 5. In this embodiment, the rear side wall of the flue gas condensate discharge device 5 is used to dock and fix with the front side wall of the housing 32. The flue gas condensate discharge device 5 is provided with a condensate outlet 51 and a third smoke outlet 52. The low-temperature flue gas is finally discharged from the third smoke outlet 52, and the condensate is discharged from the condensate outlet 51.

[0042] In this embodiment, the waste heat recovery device 3 is installed on the side wall of the burner 1. Compared with the device being installed on the top of the burner 1, this device can reduce the overall height and facilitate transportation. Furthermore, the second flue gas outlet 12 on the side wall of the burner 1 is directly connected to the first flue gas inlet 34 of the waste heat recovery device 3, avoiding the problem of heat loss of high-temperature flue gas in the pipeline due to the connection through the pipeline.

[0043] Furthermore, since a large amount of condensate is generated during the cooling process of high-temperature flue gas to the dew point, and this condensate is highly corrosive, the cooling water pipe assembly 33 is made of stainless steel with strong corrosion resistance; in this embodiment, 316L stainless steel is selected. Additionally, the inner wall of the cooling water pipe assembly 33 is coated with a corrosion-resistant and high-temperature-resistant coating; in this embodiment, polytetrafluoroethylene (PTFE) is selected to reduce the degree of corrosion of the pipes by the condensate.

[0044] To improve this embodiment, such as Figure 5 As shown, a drain pipe 36 branches off from the cold water inlet pipe 31, and a valve 37 is installed on the drain pipe 36. When the heat exchange is in normal use, the valve 37 is closed; when not in use, in order to prevent the pipes from freezing in winter, the water in the cold water pipe group 33 can be released through the valve 37.

[0045] 3. High-temperature water supply device 4;

[0046] like Figure 1 As shown, the high-temperature water supply device 4 includes a high-temperature water outlet pipe 41 connected to the outlet 38 of the cold water pipe assembly 33. A buffer tank 42 and a vertical multistage pump 43 are sequentially arranged along the water flow direction on the high-temperature water outlet pipe 41. Both the buffer tank 42 and the vertical multistage pump 43 are existing technologies. The outlet of the high-temperature water outlet pipe 41 is connected to the inlet 13 of the burner 1. Under the action of the vertical multistage pump 43, the high-temperature water output from the outlet 38 of the cold water pipe assembly 33 first enters the buffer tank 42 for high-temperature deoxygenation, and then enters the burner 1 through the high-temperature water outlet pipe 41.

[0047] To improve this embodiment, a flow meter 44, a pressure gauge 45, and a thermometer 46 are sequentially installed along the water flow direction on the high-temperature water outlet pipe 41 located between the vertical multistage pump 43 and the burner 1. These are used to detect the flow rate, pressure, and temperature of the water in the high-temperature water outlet pipe 41. This part is prior art, and the specific installation method and working principle will not be described in detail in this embodiment.

[0048] Furthermore, in this embodiment, a water outlet pipe 47 is added to the bottom of the buffer tank 42, which can be used for domestic or industrial hot water.

[0049] IV. Base 6;

[0050] like Figure 1 , 4 As shown, for ease of transportation, this embodiment also includes a base 6, on which the burner 1, waste heat recovery device 3, high-temperature water supply device 4, and flue gas condensate discharge device 5 are all mounted.

[0051] In this embodiment, the feeding device 2 feeds fuel into the burner 1, which then burns to heat the water. After combustion, high-temperature flue gas is generated in the burner 1 and enters the housing 32 of the waste heat recovery device 3. The cold water inlet pipe 31 supplies cold water to the cold water pipe assembly 33. The high-temperature flue gas exchanges heat with the cold water pipe assembly 33. After the heat exchange, the high-temperature water in the cold water pipe assembly 33 enters the high-temperature water supply device 4, and then enters the burner 1 from the high-temperature water supply device 4 to be heated, or is output from the buffer tank 42 to the place where hot water is needed. The low-temperature flue gas and condensate after heat exchange are discharged from the flue gas condensate discharge device 5.

[0052] After heat exchange, the high-temperature water enters burner 1 and is heated. Compared to burner 1 heating cold water to hot water or steam, the water entering burner 1 in this device has a certain temperature, which can reduce fuel consumption, achieve energy saving and consumption reduction, shorten steam generation time, and effectively utilize high-temperature flue gas.

[0053] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery steam generator having a vertical once-through structure, characterized by, It includes burners, feeding devices, waste heat recovery devices, high-temperature water supply devices, and flue gas condensate discharge devices; The feeding device includes a feeding pipe and a fan and an air filter installed on the feeding pipe. The output end of the feeding pipe is connected to the burner inlet. The waste heat recovery device includes a cold water inlet pipe and a housing, as well as a cold water pipe assembly connected to the cold water inlet pipe and installed inside the housing. A first flue gas inlet and a first flue gas outlet are respectively provided on two opposite side walls of the housing. The first flue gas outlet is connected to a flue gas condensate discharge device. A second flue gas outlet is provided on the side wall of the burner and is directly connected to the first flue gas inlet. The flow direction of the flue gas in the housing is perpendicular to the flow direction of the cold water, forming a countercurrent heat exchange. The flue gas condensate discharge device is equipped with a condensate outlet and a third flue gas outlet for discharging low-temperature flue gas. The high-temperature water supply device includes a high-temperature water outlet pipeline connected to the outlet end of the cold water pipeline group. A buffer tank and a vertical multistage pump are sequentially installed on the high-temperature water outlet pipeline along the water flow direction. The outlet of the high-temperature water outlet pipeline is connected to the inlet of the burner.

2. The residual heat recovery steam generator having a vertical once-through structure according to claim 1, characterized by, On the horizontal projection plane, the fan is located on the side of the burner, and the horizontal projection area of ​​the fan is independent of the horizontal projection area of ​​the burner.

3. The residual heat recovery steam generator having a vertical once-through structure according to claim 1 or 2, characterized by, The inner wall of the cold water pipe assembly is coated with a corrosion-resistant and high-temperature-resistant coating.

4. The residual heat recovery steam generator having a vertical once-through structure according to claim 3, characterized by, The cold water pipe assembly is made of stainless steel.

5. The residual heat recovery steam generator having a vertical once-through structure according to claim 4, characterized by, A drain pipe branches off from the cold water inlet pipe, and a valve is installed on the drain pipe.

6. The once-through vertical construction-based heat recovery steam generator according to any one of claims 1-2, 4-5, characterized by, A flow meter, pressure gauge, and thermometer are sequentially installed along the water flow direction on the high-temperature water outlet pipeline located between the vertical multistage pump and the burner.

7. The waste heat recovery steam generator with a vertical cross-flow structure according to claim 6, characterized in that, It also includes a base, and the burner, waste heat recovery device, high-temperature water supply device, and flue gas condensate discharge device are all integrated on the base.

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