Water balance desulfurizing tower system

Abstract

The utility model discloses a water balance desulfurization tower system which comprises a desulfurization tower, an inlet, a spraying layer, a liquid collector, a demister and a concentration clarifier, the inlet is formed in the side wall of the desulfurization tower; the spraying layer is arranged in the desulfurizing tower and located above the inlet, and the spraying layer is communicated with the bottom of the desulfurizing tower through a pipeline; the liquid collector is arranged in the desulfurizing tower and is positioned above the spraying layer; the demister is arranged in the desulfurization tower and is positioned above the liquid collector; an inlet of the concentration clarifier is connected with the liquid collector, a side wall outlet is connected with the demister, and a bottom outlet is connected with the desulfurization tower. According to the utility model, the internal structural form of the desulfurization tower is changed, the liquid collector is additionally arranged, and water after washing the demister is independently led out of the desulfurization tower system, so that the problem of unbalanced water balance of the desulfurization tower system caused by washing the demister under the condition of low smoke temperature is thoroughly solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of desulfurization, and particularly relates to a water balance desulfurization tower system. Background Art

[0002] At present, the thermal efficiency of coal-fired units in thermal power plants has a significant impact on economic evaluation. Lowering the exhaust temperature of the units can effectively improve the thermal efficiency of the units and save energy. Therefore, most thermal power plants are currently equipped with heat exchange devices to lower the exhaust temperature. The flue gas temperature entering the desulfurization tower is generally below 100°C.

[0003] The inlet flue gas temperature of the desulfurization tower of a conventional thermal power unit is above 100°C. The flue gas temperature is high, the evaporation volume is large, and the water balance of the desulfurization tower is easy to control.

[0004] Low flue gas temperature reduces the equilibrium partial pressure of SO2, which is beneficial to the dissolution of SO2 in the slurry and improves gas-liquid mass transfer. However, too low flue temperature will reduce the evaporation in the desulfurization tower, thereby reducing the water consumption of the desulfurization tower system, while the amount of water entering the desulfurization tower system remains basically unchanged, eventually resulting in more water entering the desulfurization tower system than the water discharged from the desulfurization tower system, causing an imbalance in the water balance of the desulfurization tower system and the desulfurization tower system being unable to operate normally. Utility Model Content

[0005] In view of the above problems, the utility model discloses a water balance desulfurization tower system, comprising: a desulfurization tower, an inlet, a spray layer, a liquid collector, a demister and a concentration clarifier;

[0006] The inlet is arranged on the side wall of the desulfurization tower;

[0007] The spray layer is arranged inside the desulfurization tower and above the inlet, and the spray layer is connected to the bottom of the desulfurization tower through a pipeline;

[0008] The liquid collector is arranged inside the desulfurization tower and above the spray layer;

[0009] The demister is arranged inside the desulfurization tower and above the liquid collector;

[0010] The inlet of the concentrator and clarifier is connected to the liquid collector, the side wall outlet is connected to the demister, and the bottom outlet is connected to the desulfurization tower.

[0011] Furthermore, it also includes: export;

[0012] The outlet is arranged on the side wall of the desulfurization tower and is located above the demister.

[0013] Furthermore, the liquid collector is arranged at an angle.

[0014] Furthermore, the angle between the liquid collector and the horizontal plane is in the range of 5-10°.

[0015] Furthermore, it also includes: an overflow tank and a demister flushing water pump;

[0016] The inlet of the overflow water tank is connected to the outlet of the side wall of the concentrator clarifier, and the outlet is connected to one end of the demister flushing water pump;

[0017] The other end of the demister flushing water pump is connected to the demister.

[0018] Further, it also includes: a sump and a sump pump;

[0019] The sump is connected to the bottom outlet of the concentrator clarifier;

[0020] The sump outlet is connected to one end of the sump pump;

[0021] The other end of the sump pump is connected to the desulfurization tower.

[0022] Furthermore, it also includes: a circulation pump;

[0023] One end of the circulation pump is connected to the bottom of the desulfurization tower, and the other end is connected to the spray layer.

[0024] Compared with the prior art, the beneficial effects of the utility model are: by changing the internal structure of the desulfurization tower and adding a liquid collector, the water after flushing the demister is separately led to the outside of the desulfurization tower system, which completely solves the problem of water balance imbalance in the desulfurization tower system caused by demister flushing under low flue gas temperature conditions.

[0025] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A structural schematic diagram of a water balance desulfurization tower system according to an embodiment of the utility model is shown.

[0028] Figure numerals: 1. Desulfurization tower; 2. Inlet; 3. Spray layer; 4. Liquid collector; 5. Defogger; 6. Outlet; 7. Concentrator clarifier; 8. Overflow tank; 9. Sump; 10. Defogger flushing water pump; 11. Sump pump. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In order to achieve water balance in the desulfurization tower system, the amount of water input and output from the desulfurization tower system should be kept consistent. When the output water volume decreases, the input water volume also needs to be reduced accordingly. Taking a 660MW unit as an example, the water consumption of the desulfurization tower system of a single unit is 93t / h, of which demister 5 replenishes water 63.2t / h, accounting for nearly 68%. Therefore, if the flushing water of demister 5 can be controlled not to enter desulfurization tower 1, the water balance of the desulfurization tower system will be very easy to control.

[0031] Limestone-gypsum wet flue gas desulfurization generally adopts an empty tower spray process. A spray layer 3 and a demister 5 are designed in the desulfurization tower 1. The original flue gas enters from the inlet 2 of the desulfurization tower 1, and contacts with the slurry in countercurrent to remove various pollutants. Then, the original flue gas passes through the demister 5 to remove the droplets and is discharged to the chimney through the clean flue. In order to ensure the normal and stable operation of the demister 5, the captured solid slurry needs to be flushed regularly, and the flushing water falls directly into the desulfurization tower slurry pool.

[0032] Figure 1 The schematic diagram of the structure of the water balance desulfurization tower system according to the embodiment of the utility model is shown. Figure 1 As shown, a water balance desulfurization tower system proposed by the utility model includes: a desulfurization tower 1, an inlet 2, a spray layer 3, a liquid collector 4, a demister 5 and a concentrator clarifier 7;

[0033] The inlet 2 is arranged on the side wall of the desulfurization tower 1;

[0034] The spray layer 3 is arranged inside the desulfurization tower 1 and is located above the inlet 2. The spray layer 3 is connected to the bottom of the desulfurization tower 1 through a pipeline (not shown in the figure);

[0035] The liquid collector 4 is arranged inside the desulfurization tower 1 and is located above the spray layer 3;

[0036] The demister 5 is arranged inside the desulfurization tower 1 and is located above the liquid collector 4;

[0037] The inlet of the concentrator and clarifier 7 is connected to the liquid collector 4 through a pipeline, the side wall outlet of the concentrator and clarifier 7 is connected to the demister 5, and the bottom outlet is connected to the desulfurization tower 1.

[0038] Desulfurization tower 1, used to absorb SO2 in flue gas;

[0039] Inlet 2 is used to connect the original flue to ensure that the original flue gas enters the desulfurization tower 1 through the inlet 2;

[0040] Spray layer 3 is used to provide atomized limestone slurry to provide a carrier for SO2 adsorption;

[0041] The liquid collector 4 is used to collect the flushing water of the demister 5 and separate the spraying area and the demister 5 area;

[0042] Demister 5, used to remove mist droplets in the flue gas to ensure the cleanliness of the flue gas;

[0043] The concentrator clarifier 7 is used to remove solid particles or suspended solids in the flushing water of the demister 5 .

[0044] The utility model separates the spray layer 3 from the demister 5 by arranging a liquid collector 4 between the spray layer 3 and the demister 5 in the desulfurization tower 1. The water after flushing the demister 5 is collected by the liquid collector 4 and then discharged to the concentrator clarifier 7 outside the tower. After being clarified by the concentrator clarifier 7, it is recycled, thereby completely solving the problem of water balance imbalance in the desulfurization tower 1 under low smoke temperature conditions.

[0045] The concentrator clarifier 7 is used to separate the flushing water of the demister 5 into solid and liquid by natural sedimentation without adding any reagents.

[0046] In some embodiments, the water balance desulfurization tower system further includes: an outlet 6;

[0047] The outlet 6 is arranged on the side wall of the desulfurization tower 1 and is located above the demister 5 .

[0048] Exit 6 is used to connect the clean flue to ensure that the clean flue gas enters the chimney through outlet 6.

[0049] In some embodiments, the liquid collector 4 is arranged at an angle.

[0050] In some embodiments, the angle between the liquid collector 4 and the horizontal plane is in the range of 5-10°.

[0051] The liquid collector 4 is arranged at an angle, which can effectively prevent the slurry from accumulating and promote the slurry to be quickly discharged into the concentrator clarifier 7 .

[0052] In some embodiments, the water-balanced desulfurization tower system further includes: an overflow water tank 8 and a demister flushing water pump 10;

[0053] The inlet of the overflow water tank 8 is connected to the outlet of the side wall of the concentrator clarifier 7 through a pipeline, and the outlet of the overflow water tank 8 is connected to one end of the demister flushing water pump 10;

[0054] The other end of the demister flushing water pump 10 is connected to the demister 5 through a pipeline.

[0055] Overflow water tank 8, used to collect supernatant from concentrator clarifier 7;

[0056] The demister flushing water pump 10 is used to transport the supernatant to the demister 5 for flushing.

[0057] In some embodiments, the water balance desulfurization tower system further includes: a sump 9 and a sump pump 11;

[0058] The sump 9 is connected to the bottom outlet of the concentrator clarifier 7 through a pipeline;

[0059] The outlet of the sump 9 is connected to one end of the sump pump 11 through a pipeline;

[0060] The other end of the sump pump 11 is connected to the bottom of the desulfurization tower 1 through a pipeline.

[0061] A sump 9 is used to collect the bottom flow slurry of the thickener and clarifier 7;

[0062] The sump pump 11 is used to transport the underflow slurry back to the desulfurization tower 1.

[0063] In some embodiments, the water balance desulfurization tower system further includes: a circulation pump;

[0064] One end of the circulation pump is connected to the bottom of the desulfurization tower 1 through a pipeline, and the other end is connected to the spray layer 3 through a pipeline (not shown in the figure).

[0065] The specific working process of the utility model water balance desulfurization tower system is as follows:

[0066] The original flue gas enters the desulfurization tower 1 from the inlet 2, and first contacts the slurry sprayed by the spray layer 3 in countercurrent, performs gas-liquid mass transfer, removes SO2 in the flue gas, and the purified flue gas passes through the liquid collector 4, and then enters the demister 5. After the mist droplets in the flue gas are removed by the demister 5, it is discharged to the chimney through the outlet 6 of the desulfurization tower 1. After the demister 5 runs for a period of time, gypsum slurry will accumulate. In order to ensure the performance of the demister 5, the demister 5 needs to be flushed regularly. The water after flushing the demister 5 falls into the liquid collector 4 by gravity, and flows into the thickening and clarification device 7 by gravity through the pipeline connected to the liquid collector 4. After a period of natural sedimentation, solid-liquid separation occurs, and the supernatant overflows into the overflow water tank 8. After being pressurized by the demister flushing water pump 10, the demister 5 is flushed again to realize the recycling of process water. The bottom flow of the thickening and clarification device 7 is connected to the sump 9 through a pipeline, and finally conveyed back to the desulfurization tower 1 after being pressurized by the sump pump 11.

[0067] The liquid collector 4 separates the spray layer 3 and the demister 5. The flushing water of the demister 5 does not directly enter the slurry pool of the desulfurization tower 1. Only the underflow of the concentrator clarifier 7 enters the desulfurization tower 1, which fundamentally solves the impact of low smoke temperature conditions on the water balance of the desulfurization tower.

[0068] The water after flushing the demister 5 has a certain solid content, and solid-liquid separation is achieved through natural sedimentation in the concentrator clarifier 7 without adding reagents to assist sedimentation. Therefore, the bottom flow of the concentrator clarifier 7 back to the desulfurization tower 1 has no effect on the desulfurization tower system.

[0069] The water-balanced desulfurization tower system proposed in the utility model is provided with a layer of liquid collector 4 between the spray layer 3 and the demister 5. The flushing water of the demister 5 first falls into the liquid collector 4, and is discharged to the concentrator clarifier 7 outside the desulfurization tower 1 through the pipeline connected to the liquid collector 4. The supernatant of the concentrator clarifier 7 overflows into the overflow water tank 8, and is transported to the demister 5 through the demister flushing water pump 10 to flush the demister 5, so as to achieve the purpose of recycling. The bottom flow of the concentrator clarifier 7 is regularly discharged to the sump 9, and is returned to the desulfurization tower 1 after being pressurized by the sump pump 11.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] In the description of the present utility model, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In the present utility model, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present utility model and features of different embodiments or examples without contradiction.

[0075] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water balance desulfurization tower system, characterized in that: include: Desulfurization tower (1), inlet (2), spray layer (3), liquid collector (4), demister (5) and thickener (7); The inlet (2) is arranged on the side wall of the desulfurization tower (1); The spray layer (3) is arranged inside the desulfurization tower (1) and is located above the inlet (2); the spray layer (3) is connected to the bottom of the desulfurization tower (1) through a pipeline; The liquid collector (4) is arranged inside the desulfurization tower (1) and is located above the spray layer (3); The demister (5) is arranged inside the desulfurization tower (1) and is located above the liquid collector (4); The inlet of the concentrator and clarifier (7) is connected to the liquid collector (4), the side wall outlet is connected to the demister (5), and the bottom outlet is connected to the desulfurization tower (1); The liquid collector (4) is arranged obliquely; The angle between the liquid collector (4) and the horizontal plane is in the range of 5-10°; The water balance desulfurization tower system further comprises: a sump (9) and a sump pump (11); The sump (9) is connected to the bottom outlet of the concentrator and clarifier (7); The outlet of the sump (9) is connected to one end of a sump pump (11); The other end of the sump pump (11) is connected to the desulfurization tower (1).

2. The water balance desulfurization tower system according to claim 1, characterized in that: Also includes: Export (6); The outlet (6) is arranged on the side wall of the desulfurization tower (1) and is located above the demister (5).

3. The water balance desulfurization tower system according to claim 1, characterized in that: Also includes: Overflow water tank (8) and demister flushing water pump (10); The inlet of the overflow water tank (8) is connected to the outlet of the side wall of the concentrator clarifier (7), and the outlet is connected to one end of the demister flushing water pump (10); The other end of the demister flushing water pump (10) is connected to the demister (5).

4. The water balance desulfurization tower system according to claim 1, characterized in that: Also includes: Circulation pump; One end of the circulation pump is connected to the bottom of the desulfurization tower (1), and the other end is connected to the spray layer (3).

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