Flash tank

Abstract

The invention discloses a flash tank, and belongs to the technical field of waste heat utilization, in order to improve the steam yield of slag flushing water in the flash tank, the flash tank comprises a tank body (1), a liquid inlet (11) is formed in the upper portion of the tank body (1), a containing cavity (12) is formed in the tank body (1), a flash assembly (2) is contained in the containing cavity (12), the flash assembly (2) comprises a water spraying disc (21), the upper surface of the water spraying disc (21) is a conical surface, and the lower surface of the water spraying disc (21) is a conical surface. The top end of the conical surface is upward, the bottom end of the conical surface is downward, the top end of the liquid inlet (11) is vertically opposite to the top end of the water spraying disc (21), and a gap is formed between the side peripheral wall of the tank body (1) and the water spraying disc (21). The upper surface of the water spraying disc in the flash tank is a conical surface, so that the retention time of the slag flushing water in the flash chamber is longer, and the steam yield of flash evaporation of the slag flushing water is improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat utilization, in particular to a flash tank. Background Art

[0002] With the gradual deepening of research on waste heat utilization in steel enterprises, flash heating of blast furnace slag water has become a commonly used slag water heating technology. The high-temperature slag water flashes into steam in the flash tank, then exchanges heat with heating water in the heating water heat exchanger and becomes condensed water that collects at the bottom of the heat exchanger. The condensed water is then pumped out using a water pump to ensure that the entire cycle can continue. The main component of the slag water flash heating system is the slag water flash tank. How to make the slag water produce as much steam as possible in the flash tank is the core step to improve heat exchange efficiency, and plays a decisive role in optimizing the energy-saving effect of the slag water flash heating technology. Summary of the Invention

[0003] In order to increase the steam production of slag flushing water in a flash tank, the present invention provides a flash tank, in which the upper surface of the water sprinkling plate is a conical surface, which can make the slag flushing water stay in the flash chamber for a longer time and increase the steam production of the slag flushing water flash evaporation.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A flash tank comprises a tank body, a liquid inlet is provided at the top of the tank body, a receiving cavity is contained in the tank body, a flash assembly is contained in the receiving cavity, the flash assembly comprises a water spraying plate, the upper surface of the water spraying plate is a conical surface, the top end of the conical surface faces upward and the bottom end faces downward, the liquid inlet and the top end of the water spraying plate are vertically opposite to each other, and there is a distance between the side wall of the tank body and the water spraying plate.

[0006] The beneficial effects of the present invention are:

[0007] 1. The use of a water spray plate can form a uniform flash water film for the slag flushing water. The water spray plate does not serve as a heat transfer element. Even if the surface of the water spray plate is covered with dirt, it will not affect the flash evaporation process of the slag flushing water.

[0008] 2. Compared with the traditional flash tank using dripping method, the use of water tray can make the slag flushing water stay in the flash chamber longer, thereby increasing the steam production of the flash evaporation.

[0009] 3. The steam from the flash tank is drawn out in stages and heated in steps, which can improve the utilization rate of the waste heat of the flash steam for slag flushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0011] Figure 1 It is the front view schematic diagram of the flash tank described in the present invention in Embodiment 1.

[0012] Figure 2 It is the top view schematic diagram of the water spraying tray in Embodiment 1.

[0013] Figure 3 It is the top view schematic diagram of the water guiding tray in Embodiment 1.

[0014] Figure 4 It is the top view schematic diagram of the water spraying tray in Embodiment 2.

[0015] Figure 5 It is the top view schematic diagram of the water guiding tray in Embodiment 2.

[0016] Explanation of reference numerals:

[0017] 1, tank body; 2, flash evaporation component; 3, steam header;

[0018] 11, liquid inlet; 12, accommodation cavity; 13, exhaust outlet; 14, liquid outlet;

[0019] 21, water spraying tray; 22, first radial flow channel; 23, water guiding tray; 24, second radial flow channel; 25, water collecting tray; 26, water collecting cavity; 27, flash evaporation cavity; 28, first reverse Tesla valve flow channel; 29, second reverse Tesla valve flow channel;

[0020] 31, intake branch pipe; 32, valve;

[0021] 221, first baffle plate;

[0022] 241, second baffle plate. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] For the convenience of understanding and description, absolute positional relationships are adopted in the following description of the present invention. Without special indication, the orientation word "up" represents Figure 1 the upper side direction in Figure 1 the orientation word "down" represents Figure 1 the lower side direction in Figure 1 the orientation word "left" represents Figure 1 the left side direction in Figure 1The present invention is described from the perspective of the reader or user, but the above-mentioned directional terms should not be understood or interpreted as limiting the scope of protection of the present invention. The dimensions and angles of the components herein can be determined by those skilled in the art based on actual needs or limited experiments.

[0025] Example 1

[0026] like Figure 1 As shown, a flash tank according to an embodiment of the present invention includes a tank body 1, a liquid inlet 11 is provided on the upper part of the tank body 1, the tank body 1 contains a receiving cavity 12, the receiving cavity 12 contains a flash assembly 2, the flash assembly 2 contains a water spray plate 21, the upper surface of the water spray plate 21 is a conical surface, the top of the conical surface faces upward and the bottom end faces downward, the liquid inlet 11 and the top of the water spray plate 21 are directly opposite to each other, and there is a distance between the side wall of the tank body 1 and the water spray plate 21.

[0027] The tank body 1 is an upright cylindrical structure, with the axis of the tank body 1 extending in the vertical direction. The upper surface of the water spray pan 21 is a conical surface, the taper of which can be determined through a limited number of experiments. The water spray pan 21 is an umbrella-shaped structure, with the top end of the water spray pan 21 facing upward and the bottom end facing downward. The axis of the tank body 1 and the axis of the water spray pan 21 coincide with each other. The upper surface of the water spray pan 21 can be a smooth surface, so that even if the surface of the water spray pan 21 is covered with dirt, it will not affect the flash evaporation process of the slag flushing water.

[0028] Or, as Figure 2 As shown, to increase the residence time of slag-flushing water on the upper surface of the water pan 21, the upper surface of the water pan 21 can be provided with a plurality of first radial flow channels 22. The plurality of first radial flow channels 22 are arranged at intervals along the circumference of the water pan 21 and extend radially along the water pan 21. A plurality of first baffles 221 are disposed within the first radial flow channels 22. The plurality of first baffles 221 are arranged at intervals along the radial direction of the water pan 21 and alternately connect to both sides of the first radial flow channels 22 (along the circumference of the water pan 21).

[0029] The flash assembly 2 also contains a water guide plate 23. The water spray plate 21 and the water guide plate 23 are spaced apart in the upper and lower parts. The water guide plate 23 is roughly annular in structure (or can also be called a frustum-cylindrical structure). The upper surface of the water guide plate 23 is a frustum-cylindrical surface (such as a circular frustum-cylindrical surface). The top of the frustum-cylindrical surface faces downward and the bottom end faces upward. The taper of the frustum-cylindrical surface can be obtained based on a limited number of experiments. The water guide plate 23 is a circular frustum-cylindrical structure. The top of the water guide plate 23 faces downward and the bottom end faces upward. The water guide plate 23 can make the water discharged from the water spray plate 21 continue to flow downward and gather in the center.

[0030] The upper surface of the water guide plate 23 can be a smooth surface. Figure 3As shown, in order to increase the residence time of the slag flushing water on the upper surface of the water guide plate 23, the upper surface of the water guide plate 23 may also be provided with a plurality of second radial flow channels 24. The plurality of second radial flow channels 24 are arranged at intervals along the circumference of the water guide plate 23 and extend radially along the water guide plate 23. A plurality of second baffles 241 are provided in the second radial flow channels 24. The plurality of second baffles 241 are arranged at intervals along the radial direction of the water guide plate 23 and alternately connected to both sides of the second radial flow channels 24 (along the circumference of the water guide plate 23).

[0031] like Figure 1 As shown, the top of the water guide plate 23 can be directly and sealedly connected to the side wall of the tank body 1, or it can be connected to the side wall of the tank body 1 through a water collection plate 25. The water collection plate 25 is a planar annular structure, and the axes of the tank body 1, the water guide plate 23, and the water collection plate 25 coincide. In a flash evaporation assembly 2, there is a distance between the water collection plate 25 and the water spray plate 21. The inner diameter of the water collection plate 25 is equal to the bottom diameter of the water spray plate 21. The outer edge of the water collection plate 25 is sealedly connected to the side wall of the tank body 1, and the inner edge of the water collection plate 25 is sealedly connected to the bottom of the water guide plate 23. The inner diameter of the water guide plate 23 is 10%-30% of the inner diameter of the side wall of the tank body 1.

[0032] like Figure 1 As shown, to further increase the steam production of the slag flushing water in the flash tank and ensure that the high-pressure slag flushing water fully flashes in the flash tank, the receiving cavity 12 contains multiple flash evaporation assemblies 2, which are spaced apart in the vertical direction. This can be understood as the flash tank comprising or employing a multi-stage flash evaporation structure. The steam from the flash tank is drawn out in stages and heated in steps, which can improve the utilization rate of the waste heat of the slag flushing water flash steam.

[0033] The accommodating cavity 12 is divided into a water collection cavity 26 and multiple flash evaporation cavities 27 by the flash evaporation assembly 2. The multiple flash evaporation cavities 27 are arranged at intervals in the up and down directions. The flash evaporation cavities 27 are connected to the flash evaporation assembly 2 one by one above and below. A plurality of exhaust outlets 13 are provided on the side wall of the tank body 1. The exhaust outlets 13 are connected to the flash evaporation cavities 27 one by one. The water collection cavity 26 is located at the lower end of the accommodating cavity 12. A liquid outlet 14 is provided at the lower part of the tank body 1. The liquid outlet 14 is connected to the water collection cavity 26.

[0034] like Figure 1 As shown, the flash tank may further include a steam header 3, which is located outside the tank body 1. The tank body 1 and the steam header 3 are spaced apart on the left and right sides. The steam header 3 is an upright cylindrical structure. The steam header 3 is connected to a plurality of air intake branches 31. The exhaust outlet 13 and the air intake branches 31 are connected one-to-one. A valve 32 may be provided on each air intake branch 31.

[0035] The working process of the flash tank is described below.

[0036] For example, the flash tank contains a four-stage flash evaporation structure, which is sequentially composed of a first-stage flash evaporation structure, a second-stage flash evaporation structure, a third-stage flash evaporation structure, and a fourth-stage flash evaporation structure from top to bottom. The first-stage flash evaporation structure, the second-stage flash evaporation structure, the third-stage flash evaporation structure, and the fourth-stage flash evaporation structure all contain a flash evaporation cavity 27, a water sprinkling plate 21, a water guide plate 23, and a water collecting plate 25 sequentially connected from top to bottom.

[0037] In the first-stage flash evaporation structure, the slag flushing water enters the tank body 1 from the liquid inlet 11, and the slag flushing water first sprays on the upper surface of the water spray plate 21 and continues to flow downward. The slag flushing water flashes on the upper surface of the water spray plate 21, and the flashed steam enters the flash evaporation cavity 27. Due to the action of gravity, the slag flushing water flowing out of the upper surface of the water spray plate 21 flows into the water collecting plate 25 through the gap between the water spray plate 21 and the water collecting plate 25. The slag flushing water in the water collecting plate 25 flows into the upper surface of the water guide plate 23. The slag flushing water flashes on the upper surface of the water guide plate 23, and the flashed steam also enters the flash evaporation cavity 27. The slag flushing water on the upper surface of the water guide plate 23 flows out from the lower end of the water guide plate 23.

[0038] In the second-stage flash evaporation structure, the slag-washing water flowing out of the water guide plate 23 of the first-stage flash evaporation structure is sprayed on the upper surface of the water spray plate 21 and continues to flow downward. The slag-washing water flashes on the upper surface of the water spray plate 21, and the flashed steam enters the flash evaporation cavity 27. Due to the action of gravity, the slag-washing water flowing out of the upper surface of the water spray plate 21 flows into the collecting plate 25 through the gap between the water spray plate 21 and the collecting plate 25. The slag-washing water in the collecting plate 25 flows into the upper surface of the water guide plate 23. The slag-washing water flashes on the upper surface of the water guide plate 23, and the flashed steam also enters the flash evaporation cavity 27. The slag-washing water on the upper surface of the water guide plate 23 flows out from the lower end of the water guide plate 23.

[0039] In the third-stage flash evaporation structure, the slag-washing water flowing out of the water guide plate 23 of the second-stage flash evaporation structure is sprayed on the upper surface of the water spray plate 21 and continues to flow downward. The slag-washing water flashes on the upper surface of the water spray plate 21, and the flashed steam enters the flash evaporation cavity 27. Due to the action of gravity, the slag-washing water flowing out of the upper surface of the water spray plate 21 flows into the collecting plate 25 through the gap between the water spray plate 21 and the collecting plate 25. The slag-washing water in the collecting plate 25 flows into the upper surface of the water guide plate 23. The slag-washing water flashes on the upper surface of the water guide plate 23, and the flashed steam also enters the flash evaporation cavity 27. The slag-washing water on the upper surface of the water guide plate 23 flows out from the lower end of the water guide plate 23.

[0040] In the fourth-stage flash evaporation structure, the slag-washing water flowing out of the water guide plate 23 of the third-stage flash evaporation structure is sprayed on the upper surface of the water spray plate 21 and continues to flow downward. The slag-washing water flashes on the upper surface of the water spray plate 21, and the flashed steam enters the flash evaporation cavity 27. Due to the action of gravity, the slag-washing water flowing out of the upper surface of the water spray plate 21 flows into the collecting plate 25 through the gap between the water spray plate 21 and the collecting plate 25. The slag-washing water in the collecting plate 25 flows into the upper surface of the water guide plate 23. The slag-washing water flashes on the upper surface of the water guide plate 23, and the flashed steam also enters the flash evaporation cavity 27. The slag-washing water on the upper surface of the water guide plate 23 flows out from the lower end of the water guide plate 23.

[0041] The slag-flushing water flowing out of the water guide plate 23 of the fourth-stage flash evaporation structure enters the water collecting cavity 26 and gathers therein. The slag-flushing water gathered in the water collecting cavity 26 can be discharged through the liquid outlet 14. The steam in the flash evaporation cavity 27 enters the steam manifold 3 through the air inlet branch pipe 31. The steam manifold 3 includes a steam outlet, which can be located at the upper end of the steam manifold 3. The steam in the steam manifold 3 can be discharged through the steam outlet.

[0042] Example 2

[0043] This embodiment is a modification of the first embodiment. The main differences between this embodiment and the first embodiment are:

[0044] like Figure 4 As shown, a plurality of first reverse Tesla valve flow channels 28 are provided on the upper surface of the water spray plate 21. The plurality of first reverse Tesla valve flow channels 28 are arranged at intervals along the circumference of the water spray plate 21. The first reverse Tesla valve flow channels 28 extend radially along the water spray plate 21. The inlet end of the first reverse Tesla valve flow channel 28 is located at the top of the water spray plate 21, and the outlet end of the first reverse Tesla valve flow channel 28 is located at the bottom of the water spray plate 21.

[0045] like Figure 5 As shown, a plurality of second reverse Tesla valve flow channels 29 are provided on the upper surface of the water guide plate 23, and the plurality of second reverse Tesla valve flow channels 29 are arranged at intervals along the circumference of the water guide plate 23. The second reverse Tesla valve flow channels 29 extend radially along the water guide plate 23, and the inlet end of the second reverse Tesla valve flow channel 29 is located at the bottom of the water guide plate 23, and the outlet end of the second reverse Tesla valve flow channel 29 is located at the top of the water guide plate 23; in a flash evaporation component 2, the projections of the first reverse Tesla valve flow channel 28 and the second reverse Tesla valve flow channel 29 on the horizontal plane are alternately arranged along the circumference of the water spray plate 21.

[0046] The first reverse Tesla valve flow channel 28 and the second reverse Tesla valve flow channel 29 are both reverse Tesla valve structures. In the first reverse Tesla valve flow channel 28 and the second reverse Tesla valve flow channel 29, the flow encounters greater resistance in the process of flowing from the inlet end to the outlet end, and the fluids collide with each other, which can further increase the steam production of the slag flushing water in the flash tank.

[0047] Other technical features in this embodiment may be the same as those in Example 1. To save space, this embodiment will not be described in detail.

[0048] The above description is merely a specific embodiment of the present invention and is not intended to limit the scope of the invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features of the present invention may be freely combined with each other, with each other's technical solutions, and with each other's technical solutions.

Claims

1. A flash tank, characterized in that: The flash tank comprises a tank body (1), a liquid inlet (11) is arranged at the top of the tank body (1), a receiving cavity (12) is contained in the tank body (1), a flash assembly (2) is contained in the receiving cavity (12), the flash assembly (2) comprises a water spraying plate (21), the upper surface of the water spraying plate (21) is a conical surface, the top end of the conical surface faces upward and the bottom end faces downward, the liquid inlet (11) and the top end of the water spraying plate (21) face each other vertically, and there is a distance between the side wall of the tank body (1) and the water spraying plate (21).

2. The flash tank according to claim 1, characterized in that: The upper surface of the water spraying plate (21) is provided with a plurality of first radial flow channels (22), the plurality of first radial flow channels (22) are arranged at intervals along the circumference of the water spraying plate (21), and the first radial flow channels (22) extend in the radial direction of the water spraying plate (21).

3. The flash tank according to claim 2, characterized in that: A plurality of first baffles (221) are arranged in the first radial flow channel (22); the plurality of first baffles (221) are arranged at intervals along the radial direction of the water spraying plate (21); and the plurality of first baffles (221) are alternately connected to both sides of the first radial flow channel (22).

4. The flash tank according to claim 1, characterized in that: The flash steam assembly (2) further comprises a water guide plate (23), the water spray plate (21) and the water guide plate (23) are arranged at intervals up and down, the water guide plate (23) is an annular structure, the upper surface of the water guide plate (23) is a frustum cylindrical surface, the top end of the frustum cylindrical surface faces downward and the bottom end faces upward, and the water guide plate (23) can make the water discharged from the water spray plate (21) continue to flow downward.

5. The flash tank according to claim 4, characterized in that: The upper surface of the water guide plate (23) is provided with a plurality of second radial flow channels (24), the plurality of second radial flow channels (24) are arranged at intervals along the circumference of the water guide plate (23), and the second radial flow channels (24) extend in the radial direction of the water guide plate (23).

6. The flash tank according to claim 5, characterized in that: A plurality of second baffles (241) are arranged in the second radial flow channel (24); the plurality of second baffles (241) are arranged at intervals along the radial direction of the water guide plate (23); and the plurality of second baffles (241) are alternately connected to both sides of the second radial flow channel (24).

7. The flash tank according to claim 4, characterized in that: The top end of the water guide plate (23) is connected to the side wall of the tank body (1) through a water collecting plate (25). The water collecting plate (25) is an annular structure, and the inner diameter of the water collecting plate (25) is equal to the bottom end diameter of the water spraying plate (21).

8. The flash tank according to claim 4, characterized in that: The accommodating cavity (12) contains a plurality of flash evaporation assemblies (2), which are arranged at intervals in the vertical direction. The accommodating cavity (12) is divided into a water collection cavity (26) and a plurality of flash evaporation cavities (27) by the flash evaporation assemblies (2). The flash evaporation cavities (27) are connected to the flash evaporation assemblies (2) one by one in the upper and lower parts. A plurality of exhaust outlets (13) are provided on the side wall of the tank body (1), and the exhaust outlets (13) are connected to the flash evaporation cavities (27) one by one in the upper and lower parts. A liquid outlet (14) is provided at the bottom of the tank body (1), and the liquid outlet (14) is connected to the water collection cavity (26).

9. The flash tank according to claim 8, characterized in that: A plurality of first reverse Tesla valve flow channels (28) are arranged on the upper surface of the water spraying plate (21), the plurality of first reverse Tesla valve flow channels (28) are arranged at intervals along the circumference of the water spraying plate (21), the first reverse Tesla valve flow channels (28) extend in the radial direction of the water spraying plate (21), the inlet end of the first reverse Tesla valve flow channel (28) is located at the top of the water spraying plate (21), and the outlet end of the first reverse Tesla valve flow channel (28) is located at the bottom of the water spraying plate (21).

10. The flash tank according to claim 9, characterized in that: A plurality of second reverse Tesla valve flow channels (29) are arranged on the upper surface of the water guide plate (23), the plurality of second reverse Tesla valve flow channels (29) are arranged at intervals along the circumference of the water guide plate (23), the second reverse Tesla valve flow channels (29) extend radially along the water guide plate (23), the inlet end of the second reverse Tesla valve flow channel (29) is located at the bottom of the water guide plate (23), and the outlet end of the second reverse Tesla valve flow channel (29) is located at the top of the water guide plate (23); in a flash assembly (2), the projections of the first reverse Tesla valve flow channel (28) and the second reverse Tesla valve flow channel (29) on a horizontal plane are alternately arranged along the circumference of the water spray plate (21).

Images