Steam heat recovery device of boiler periodic blowdown flash tank

Abstract

The steam heat recovery device comprises a waste heat recovery tank, a first water spraying heat absorption mechanism and a second water spraying heat absorption mechanism, wherein the first water spraying heat absorption mechanism and the second water spraying heat absorption mechanism are installed in the waste heat recovery tank. The first water spraying heat absorption mechanism comprises a first water spraying pipe and a first water distribution plate installed below the first water spraying pipe. The first water spraying pipe comprises a first outer water spraying pipe fixed to the inner wall of the waste heat recovery tank and a first inner water spraying pipe located on the inner side of the first outer water spraying pipe and communicated with the first outer water spraying pipe through a first connecting pipe. The second water spraying heat absorption mechanism comprises a second water spraying pipe and a second water distribution plate installed below the second water spraying pipe, and the second water spraying pipe comprises a second outer water spraying pipe fixed to the inner wall of the waste heat recovery tank and a second inner water spraying pipe located above the inner side of the second outer water spraying pipe. The second outer water spraying pipe communicates with the second inner water spraying pipe through a second connecting pipe. According to the utility model, the energy utilization efficiency is improved, the energy waste is reduced, and the economic benefit is increased.

Description

Technical Field

[0001] This utility model relates to the field of waste steam heat recovery technology, and in particular to a steam heat recovery device for boiler blowdown expansion vessel. Background Technology

[0002] The periodic blowdown expansion tank is mainly used to reduce the pressure and expand the capacity of the boiler's periodic wastewater. The periodic blowdown wastewater undergoes secondary boiling at a lower pressure, generating some secondary steam, while simultaneously cooling the wastewater. The secondary steam and wastewater are separated inside the periodic blowdown expansion tank. The separated steam is discharged from the upper outlet, while the wastewater is discharged into the ditch from the lower wastewater outlet.

[0003] Currently, most power plants directly discharge secondary steam from boiler blowdown expansion vessels into the atmosphere. This discharged steam has a high calorific value, resulting in significant energy waste and hindering energy conservation and environmental protection. Therefore, there is an urgent need for a steam heat recovery device for boiler blowdown expansion vessels to recover and utilize steam heat, thereby improving energy efficiency and increasing economic benefits. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a steam heat recovery device for a boiler constant discharge expansion vessel.

[0005] This utility model is achieved through the following technical solution: a steam heat recovery device for a boiler fixed-discharge expansion vessel is provided, including a waste heat recovery tank and a first water spraying heat absorption mechanism and a second water spraying heat absorption mechanism installed inside the waste heat recovery tank; the first water spraying heat absorption mechanism includes a first water spray pipe and a first water distribution plate installed below the first water spray pipe, the first water spray pipe includes a first outer water spray pipe fixed to the inner wall of the waste heat recovery tank and a first inner water spray pipe located inside the first outer water spray pipe and connected to the first outer water spray pipe through a first connecting pipe; the second water spraying heat absorption mechanism includes a second water spray pipe and a second water distribution plate installed below the second water spray pipe, the second water spray pipe includes a second outer water spray pipe fixed to the inner wall of the waste heat recovery tank and a second inner water spray pipe located above the inner side of the second outer water spray pipe, the second outer water spray pipe and the second inner water spray pipe are connected through a second connecting pipe.

[0006] Preferably, a plurality of first external nozzles spraying inward are evenly distributed on the first external water spray pipe, and a plurality of first internal nozzles spraying inward and a plurality of first intermediate nozzles spraying outward are evenly distributed on the first internal water spray pipe.

[0007] Preferably, the first outer nozzle, the first inner nozzle, and the first intermediate nozzle are all high-pressure nozzles. The first outer nozzle and the first inner nozzle spray water inward, while the first intermediate nozzle sprays water outward. Together, they spray water to form a jet water curtain, which enhances the heat exchange effect between steam and water.

[0008] Preferably, the first water distribution plate is a funnel-shaped structure whose width gradually increases from top to bottom, and the upper end of the first water distribution plate is fixed to the bottom surface of the first inner water spray pipe. The water sprayed from the first outer nozzle, the first inner nozzle and the first intermediate nozzle falls onto the first water distribution plate and flows down through the lower end of the first water distribution plate to form an annular water curtain, which further enhances the heat exchange effect between steam and water.

[0009] Preferably, a plurality of second outer nozzles spraying inward are evenly distributed on the second outer water spray pipe, and a plurality of second inner nozzles spraying inward and a plurality of second intermediate nozzles spraying outward are evenly distributed on the second inner water spray pipe.

[0010] Preferably, the second outer nozzle, the second inner nozzle, and the second intermediate nozzle are all high-pressure nozzles. The second outer nozzle and the second inner nozzle spray water inward, while the second intermediate nozzle sprays water outward. Together, they spray water to form two layers of water curtain, which enhances the heat exchange effect between steam and water.

[0011] Preferably, the second water distribution plate is a funnel-shaped structure whose width gradually decreases from top to bottom, and the upper end of the second water distribution plate is fixed to the inner wall of the waste heat recovery tank. Part of the water sprayed from the second nozzle falls onto the second water distribution plate and flows down through the lower end of the second water distribution plate to form an annular water curtain, further enhancing the heat exchange effect between steam and water.

[0012] Preferably, in order to enhance the recovery effect of steam waste heat, there are two sets of the first water spray heat absorption mechanism and the second water spray heat absorption mechanism, which are arranged alternately from bottom to top.

[0013] Preferably, the waste heat recovery tank is provided with an exhaust port at the top and a water storage tank at the bottom. One end of the air inlet pipe is connected to the steam output pipe of the boiler's fixed exhaust expansion vessel, and the other end extends into the bottom of the water storage tank. A drain port is provided at the bottom of the water storage tank.

[0014] Preferably, a baffle plate is installed above the air intake pipe. The baffle plate is a funnel-shaped structure whose width gradually decreases from top to bottom, and its upper end is fixed to the inner wall of the waste heat recovery tank. Water flowing down from the lower end of the first water distribution plate falls onto the baffle plate, forming another annular water curtain below the baffle plate. This further enhances the contact between steam and water, improves the heat exchange effect, and the baffle plate also prevents the water curtain from continuously scouring the air intake pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. This utility model forms a multi-layered spray water curtain through the structural cooperation of the first spray pipe and the second spray pipe. The waste heat of steam is recovered through the circulating cooling water curtain. The first water distribution plate set below the first spray pipe and the second water distribution plate set below the second spray pipe form multiple annular water curtains, which further improves the waste heat recovery effect of steam.

[0017] 2. This utility model maximizes the recovery of steam heat from the boiler's fixed-discharge expansion vessel, thereby improving energy utilization efficiency, reducing energy waste, and increasing economic benefits. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 2 This is a top view of the first water spray heat absorption mechanism of this utility model;

[0020] Figure 3 This is a top view of the second water spray heat absorption mechanism of this utility model;

[0021] Figure 4 This is a longitudinal sectional view of the first water spray heat absorption mechanism of this utility model.

[0022] Figure 5 This is a longitudinal sectional view of the second water spray heat absorption mechanism of this utility model.

[0023] As shown in the figure:

[0024] 1. Waste heat recovery tank; 2. First water distribution plate; 3. First external water spray pipe; 4. First connecting pipe; 5. First internal water spray pipe; 6. First external nozzle; 7. First internal nozzle; 8. First intermediate nozzle; 9. Water baffle; 10. Second water distribution plate; 11. Second external water spray pipe; 12. Second internal water spray pipe; 13. Second connecting pipe; 14. Second external nozzle; 15. Second internal nozzle; 16. Second intermediate nozzle; 17. Exhaust port; 18. Water storage tank; 19. Air inlet pipe; 20. Drain port. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0026] like Figure 1-5 As shown, this utility model includes a waste heat recovery tank 1 and a first water spraying heat absorption mechanism and a second water spraying heat absorption mechanism installed inside the waste heat recovery tank 1.

[0027] The first water spraying heat absorption mechanism includes a first water spray pipe and a first water distribution plate 2 installed below the first water spray pipe. The first water spray pipe includes a first outer water spray pipe 3 fixed to the inner wall of the waste heat recovery tank 1 and a first inner water spray pipe 5 located inside the first outer water spray pipe 3 and connected to the first outer water spray pipe 3 through a first connecting pipe 4.

[0028] Several first external nozzles 6 that spray inward are evenly distributed on the first external water spray pipe 3, and several first internal nozzles 7 that spray inward and several first intermediate nozzles 8 that spray outward are evenly distributed on the first internal water spray pipe 5. The first external nozzles 6, the first internal nozzles 7 and the first intermediate nozzles 8 are all high-pressure nozzles. The first external nozzles 6 and the first internal nozzles 7 spray water inward, and the first intermediate nozzles 8 spray water outward. Together, they spray water to form a layer of spray water curtain, which enhances the heat exchange effect between steam and water.

[0029] The first water distribution plate 2 is a funnel-shaped structure whose width gradually increases from top to bottom. The upper end of the first water distribution plate 2 is fixed to the bottom surface of the first inner water spray pipe 5. The water sprayed from the first outer nozzle 6, the first inner nozzle 7 and the first intermediate nozzle 8 falls onto the first water distribution plate 2 and flows down through the lower end of the first water distribution plate 2 to form an annular water curtain, which further enhances the heat exchange effect between steam and water.

[0030] The second water spraying heat absorption mechanism includes a second water spray pipe and a second water distribution plate 10 installed below the second water spray pipe. The second water spray pipe includes a second outer water spray pipe 11 fixed to the inner wall of the waste heat recovery tank 1 and a second inner water spray pipe 12 located above the inner side of the second outer water spray pipe 11. The second outer water spray pipe 11 and the second inner water spray pipe 12 are connected through a second connecting pipe 13.

[0031] Several second external nozzles 14 that spray inward are evenly distributed on the second external water spray pipe 11, and several second internal nozzles 15 that spray inward and several second intermediate nozzles 16 that spray outward are evenly distributed on the second internal water spray pipe 12. The second external nozzles 14, the second internal nozzles 15 and the second intermediate nozzles 16 are all high-pressure nozzles. The second external nozzles 14 and the second internal nozzles 15 spray water inward, and the second intermediate nozzles 16 spray water outward. Together, they spray water to form two layers of water curtain, which enhances the heat exchange effect between steam and water.

[0032] The second water distribution plate 10 is a funnel-shaped structure with a width that gradually decreases from top to bottom. The upper end of the second water distribution plate 10 is fixed to the inner wall of the waste heat recovery tank 1. The water sprayed from the second nozzle falls onto the second water distribution plate 10 and flows down through the lower end of the second water distribution plate 10 to form an annular water curtain, which further enhances the heat exchange effect between steam and water.

[0033] In this embodiment, in order to enhance the recovery effect of steam waste heat, there are two sets of the first water spray heat absorption mechanism and the second water spray heat absorption mechanism, which are arranged alternately from bottom to top.

[0034] The waste heat recovery tank 1 is equipped with an exhaust port 17 at the top. The gas after the steam enters the waste heat recovery tank 1 and the waste heat is recovered is discharged through the exhaust port 17. The bottom of the waste heat recovery tank 1 is a water storage tank 18. One end of the air inlet pipe 19 is connected to the steam output pipe of the boiler's fixed discharge expansion vessel, and the other end extends into the bottom of the water storage tank 18. In this embodiment, there are two air inlet pipes 19 arranged symmetrically. A drain port 20 is provided at the bottom of the water storage tank 18. A valve is installed on the drain port 20, and the drain port 20 is opened periodically to drain water.

[0035] In this embodiment, a baffle plate 9 is installed above the air intake pipe 19. The baffle plate 9 is a funnel-shaped structure with a width that gradually decreases from top to bottom. The upper end of the baffle plate 9 is fixed to the inner wall of the waste heat recovery tank 1. Water flowing down from the lower end of the first water distribution plate 2 falls onto the baffle plate 9, forming an annular water curtain below the baffle plate 9. This further enhances the contact between steam and water, improves the heat exchange effect, and the baffle plate 9 also prevents the water curtain from continuously scouring the air intake pipe 19.

[0036] Steam from the boiler's fixed-discharge expansion vessel enters the water storage tank 18 through the inlet pipe 19. The steam undergoes initial heat exchange with the water in the water storage tank 18. After passing through the water storage tank 18, the steam rises and passes through multiple layers of spray water curtains. The steam rising along the area near the inner wall of the waste heat recovery tank 1 also passes through multiple annular water curtains. The multiple layers of spray water curtains and multiple annular water curtains greatly enhance the contact between the steam and water, improve the heat exchange efficiency, and maximize the recovery of steam heat.

[0037] This invention utilizes the structural cooperation of a first and second water spray pipe to form a multi-layered spray water curtain. Waste heat from the steam is recovered through this circulating cooling water curtain. Multiple annular water curtains are formed by a first water distribution plate 2 below the first water spray pipe and a second water distribution plate 10 below the second water spray pipe, further improving the waste heat recovery effect. This invention maximizes the recovery of steam heat from the boiler's fixed-discharge expansion vessel, improving energy utilization efficiency, reducing energy waste, and increasing economic benefits.

[0038] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A steam heat recovery device for a boiler with constant discharge expansion vessel, characterized in that: The device includes a waste heat recovery tank and a first water spraying heat absorption mechanism and a second water spraying heat absorption mechanism installed inside the waste heat recovery tank. The first water spraying heat absorption mechanism includes a first water spray pipe and a first water distribution plate installed below the first water spray pipe. The first water spray pipe includes a first outer water spray pipe fixed to the inner wall of the waste heat recovery tank and a first inner water spray pipe located inside the first outer water spray pipe and connected to the first outer water spray pipe through a first connecting pipe. The second water spraying heat absorption mechanism includes a second water spray pipe and a second water distribution plate installed below the second water spray pipe. The second water spray pipe includes a second outer water spray pipe fixed to the inner wall of the waste heat recovery tank and a second inner water spray pipe located above the inner side of the second outer water spray pipe. The second outer water spray pipe and the second inner water spray pipe are connected through a second connecting pipe.

2. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: Several first external nozzles that spray inward are evenly distributed on the first external water spray pipe, and several first internal nozzles that spray inward and several first intermediate nozzles that spray outward are evenly distributed on the first internal water spray pipe.

3. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: The first water distribution plate is a funnel-shaped structure whose width gradually increases from top to bottom, and the upper part of the first water distribution plate is fixed to the bottom surface of the first inner water spray pipe.

4. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: Several second outer nozzles that spray inward are evenly distributed on the second outer water spray pipe, and several second inner nozzles that spray inward and several second middle nozzles that spray outward are evenly distributed on the second inner water spray pipe.

5. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: The second water distribution plate is a funnel-shaped structure whose width gradually decreases from top to bottom, and the upper part of the second water distribution plate is fixed to the inner wall of the waste heat recovery tank.

6. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: The first water spray heat absorption mechanism and the second water spray heat absorption mechanism are both in two sets, and the first water spray heat absorption mechanism and the second water spray heat absorption mechanism are alternately arranged from bottom to top.

7. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: An exhaust port is provided at the top of the waste heat recovery tank, and a water storage tank is provided at the bottom of the waste heat recovery tank. One end of the air inlet pipe is connected to the steam output pipe of the boiler's fixed exhaust expansion vessel, and the other end extends into the bottom of the water storage tank. A drain port is provided at the bottom of the water storage tank.

8. The steam heat recovery device for a boiler with constant discharge expansion vessel according to claim 1, characterized in that: A baffle plate is installed above the air intake pipe. The baffle plate is a funnel-shaped structure whose width gradually decreases from top to bottom, and the upper end of the baffle plate is fixed to the inner wall of the waste heat recovery tank.

Images