Novel wet desulfurization tower structure with low water content in flue gas

Abstract

The utility model relates to the technical field of flue gas purification treatment, in particular to a novel wet desulfurization tower structure with low flue gas water content, which comprises a desulfurization tower body, a side inlet for flue gas introduction is arranged on one side of the desulfurization tower body, and a flue outlet for flue gas output is further arranged at the top of the desulfurization tower body; the desulfurizing tower body is sequentially divided into a slurry layer, a spraying area and a demisting layer from bottom to top; the desulfurizing tower body is further provided with an expansion cooling layer used for increasing the heat exchange area of flue gas and air. Desulfurization slurry is more uniformly sprayed into flue gas through the multiple spraying layers which are arranged in a staggered manner, the desulfurization effect of the spraying areas on the flue gas is improved, the sulfur content of the flue gas is reduced, the interception and precipitation effect on moisture in the flue gas is improved through double cooperation of the expansion cooling layer and the demisting layer, the moisture content in the discharged flue gas is further reduced, and the desulfurization effect of the flue gas is improved. The water in the flue gas is recycled, so that the water consumption of the device is reduced, and the influence of the water on the surrounding environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification and treatment, in particular to a novel wet desulfurization tower structure with low water content in flue gas. Background Art

[0002] my country is a major coal-consuming country. A large amount of sulfur dioxide is produced in the process of coal combustion. Sulfur dioxide has a significant harm to the atmosphere. Sulfur dioxide is a precursor to the formation of haze and is also the culprit for the formation of sulfuric acid rain. Therefore, it is imperative to purify and control the sulfur dioxide in coke oven flue gas.

[0003] The current desulfurization process is mainly wet desulfurization. A major feature of wet desulfurization is that it needs to use water to dilute and hydrolyze the desulfurizer into a desulfurization slurry, and then atomize it into small droplets through a nozzle and spray it into the desulfurization tower, where it reacts chemically with sulfur dioxide in the flue gas to absorb and remove the sulfur dioxide. Although this method can effectively reduce the sulfur dioxide content in the flue gas, the wet flue gas discharged after purification often carries a large amount of water, dragging a long "white tail", and even worse, it will form "white rain" within a certain range around the chimney, polluting the working environment. While paying attention to the sulfur dioxide content of wet desulfurization reaching the standard, we should also pay attention to the impact of a large amount of water-containing flue gas discharged into the atmosphere on the environment on which we depend for survival.

[0004] Most of the existing wet desulfurization towers adopt a straight-cylinder flue gas channel structure, and the heat exchange area between the flue gas and the air is limited, so that most of the water vapor in the flue gas will still be discharged into the atmosphere along with the flue gas. While increasing unnecessary waste of water resources, it is easy to form white rain around the working environment, polluting the surrounding working environment. Therefore, it is necessary to reduce the water content in the flue gas discharged from the wet desulfurization tower. Utility Model Content

[0005] To this end, the utility model provides a novel wet desulfurization tower structure with low flue gas water content, so as to overcome the problem in the prior art that the flue gas discharged from the existing desulfurization tower has a high water content and is prone to form "white rain" that harms the surrounding environment.

[0006] To achieve the above-mentioned purpose, the utility model provides a novel wet desulfurization tower structure with low water content in flue gas, comprising a desulfurization tower body, a side inlet for flue gas to enter is arranged on one side of the desulfurization tower body, and a flue outlet for flue gas to be output is also arranged on the top of the desulfurization tower body;

[0007] The desulfurization tower body is divided into a slurry layer, a spraying area and a demisting layer from bottom to top, wherein:

[0008] The slurry layer is located at the bottom area of ​​the desulfurization tower body and is used to store desulfurization slurry;

[0009] The spraying area is connected to the slurry layer through a slurry conveying pipeline, and is used to spray desulfurization slurry onto the flue gas entering the desulfurization tower body;

[0010] The demisting layer is located below the flue outlet and performs demisting operation on the flue gas after passing through the spraying area;

[0011] The desulfurization tower body is also provided with an expansion cooling layer for increasing the heat exchange area between the flue gas and the air, and the expansion cooling layer is arranged between the spraying area and the demisting layer.

[0012] Furthermore, the slurry layer comprises a slurry pool, and one side of the slurry pool is provided with a liquid exchange port for auxiliary liquid exchange and an output port for outputting the desulfurized slurry to the outside.

[0013] Further, the spraying area includes a bottom spraying layer and a plurality of upper spraying layers;

[0014] One side of the bottom spray layer and the plurality of upper spray layers is provided with a corresponding slurry delivery pipeline interface;

[0015] A plurality of the upper spray layers and the bottom spray layer are arranged in a staggered manner.

[0016] Furthermore, a plurality of defoggers are arranged inside the defog layer, and two first observation and maintenance ports are arranged on the outer surface of the defog layer.

[0017] Furthermore, a plurality of second observation and maintenance openings are arranged on one side of the spraying area, and the arrangement positions of the plurality of second observation and maintenance openings correspond to the arrangement positions of the plurality of upper spraying layers.

[0018] Furthermore, the side inlet is arranged between the slurry pool and the bottom spray layer, and the side inlet is connected to the desulfurization tower body through an inlet bracket.

[0019] Furthermore, the expansion and cooling layer includes a connection change zone and a heat exchange zone, and the expansion and cooling layer is respectively connected to the spray zone and the demisting layer of the desulfurization tower body through the connection change zone.

[0020] Furthermore, the heat exchange zone is formed by a ring array of a plurality of smoke passages for circulating smoke, and the plurality of smoke passages are arranged at circumferential intervals.

[0021] Furthermore, a heat exchange channel for air circulation is formed between the outer surfaces of any two adjacent flue gas passages.

[0022] Furthermore, a fixing base for auxiliary fixation is also provided at the bottom of the desulfurization tower body, and the desulfurization tower body is fixedly connected to the fixing base by anchor nails.

[0023] Compared with the prior art, the beneficial effect of the utility model lies in that the desulfurization slurry is sprayed into the flue gas more evenly through multiple layers of staggered spray layers, thereby increasing the desulfurization effect of the spray area on the flue gas and reducing the sulfur content of the flue gas. The double coordination of the expansion cooling layer and the demisting layer increases the interception and precipitation effect of moisture in the flue gas, further reducing the water content in the exhaust flue gas, recycling and reusing the moisture in the flue gas to reduce the water consumption of the device while reducing its impact on the surrounding environment.

[0024] Furthermore, by adding a flue gas passage in a circular array on the upper layer of the spray area, air is allowed to pass through the outside of the flue gas passage, thereby expanding the heat exchange area between the flue gas and the air. The temperature difference between the flue gas and the air is utilized to accelerate the cooling of the flue gas. By lowering the flue gas temperature, the saturated water vapor in the flue gas is precipitated into droplets, which drip back into the slurry pool at the bottom of the desulfurization tower body under the action of gravity to reduce the water content in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the desulfurization tower body of the utility model;

[0026] Figure 2 It is a partial cross-sectional view of one side of the desulfurization tower body of the utility model;

[0027] Figure 3 It is a partial cross-sectional view of the other side of the desulfurization tower body of the utility model;

[0028] Figure 4 This is a schematic diagram of the overall structure of the expansion cooling layer 300 of the utility model;

[0029] Figure 5 It is a transverse cross-sectional view of the expansion cooling layer 300 of the utility model;

[0030] Figure 6 It is a schematic structural diagram of a heat exchange zone of another embodiment of the utility model.

[0031] In the figure: 1-desulfurization tower body, 100-slurry layer, 200-spraying area, 300-expansion cooling layer, 400-demist layer, 10-demister, 11-slurry pool, 12-liquid exchange port, 13-bottom spray layer, 14-upper spray layer, 15-slurry delivery pipeline interface, 16-first observation and maintenance port, 17-second observation and maintenance port, 18-connection change area, 19-heat exchange area, 191-flue gas passage, 192-heat exchange channel, 2-side inlet, 21-inlet bracket, 3-flue outlet, 4-fixed base. DETAILED DESCRIPTION

[0032] In order to make the purpose and advantages of the utility model more clearly understood, the utility model is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] See also Figure 1 ,like Figure 1 As shown, it is a schematic diagram of the overall structure of the desulfurization tower body of the utility model;

[0037] Specifically, the embodiment of the present application provides a novel wet desulfurization tower structure with low water content in flue gas, including a desulfurization tower body 1, a side inlet 2 for flue gas is provided on one side of the desulfurization tower body 1, and a flue outlet 3 for flue gas output is also provided on the top of the desulfurization tower body 1;

[0038] The desulfurization tower body 1 is divided into a slurry layer 100, a spraying area 200 and a demisting layer 400 from bottom to top, wherein:

[0039] The slurry layer 100 is located at the bottom area of ​​the desulfurization tower body 1 and is used to store desulfurization slurry;

[0040] The spraying area 200 is connected to the slurry layer 100 through a slurry conveying pipeline, and is used to spray desulfurization slurry onto the flue gas entering the desulfurization tower body 1;

[0041] The demisting layer 400 is located below the flue outlet 3 and performs demisting operation on the flue gas after passing through the spraying area 200;

[0042] The desulfurization tower body 1 is also provided with an expansion cooling layer 300 for increasing the heat exchange area between the flue gas and the air. The expansion cooling layer 300 is arranged between the spraying area 200 and the demisting layer 400.

[0043] The desulfurization slurry is sprayed more evenly into the flue gas through multiple staggered spray layers, thereby increasing the desulfurization effect of the spray area 200 on the flue gas and reducing the sulfur content of the flue gas. The double cooperation of the expansion cooling layer 300 and the demisting layer 400 increases the interception and precipitation effect of the water in the flue gas, further reducing the water content in the exhaust flue gas, and recycling the water in the flue gas to reduce the water consumption of the device and reduce its impact on the surrounding environment.

[0044] Among them, a booster fan can be set at the side inlet 2 to assist the flue gas to enter the desulfurization tower body 1 for wet desulfurization. After the desulfurized flue gas enters the interior of the desulfurization tower body 1 through the side inlet 2, the desulfurization slurry is extracted from the slurry layer 100 at the bottom of the desulfurization tower by an external slurry delivery pump and transported to the spray area 200, and the flue gas entering the desulfurization tower body 1 is subjected to multi-layer spraying operation to remove sulfur dioxide in the flue gas. The flue gas after spraying and desulfurization gradually rises to the expansion and cooling layer 300, and the heat exchange area between the flue gas and the air is expanded through the expansion and cooling layer 300 with a multi-stage bending structure. The temperature difference between the air and the flue gas is used to accelerate the reduction of the temperature of the flue gas itself, so that the moisture in the flue gas is condensed and precipitated, and the water content in the flue gas is reduced. The remaining water vapor in the flue gas is intercepted and captured by the demister 10 in the demisting layer 400, and its water content is further reduced before it is discharged through the flue outlet 3.

[0045] Please continue reading Figure 2 ,like Figure 2 As shown, it is a partial cross-sectional view of one side of the desulfurization tower body of the utility model;

[0046] Specifically, the slurry layer 100 includes a slurry pool 11, and one side of the slurry pool 11 is provided with a liquid replacement port 12 for auxiliary liquid replacement and an output port for outputting the desulfurized slurry to the outside.

[0047] A slurry delivery pump is provided at the output port for pumping the desulfurization slurry in the slurry pool 11 to the spray area 200. The input end of the slurry delivery pump is connected to the output port through a corresponding input pipeline, and the output end is connected to the bottom spray layer 13 and the upper spray layer 14 through a corresponding slurry delivery pipeline and a corresponding slurry delivery pipeline interface 15, so as to pressurize and deliver the desulfurization slurry to the corresponding spray layer. The number or model of the slurry delivery pump can be selected according to the needs, and no further introduction will be given here.

[0048] Specifically, the spraying area 200 includes a bottom spraying layer 13 and a plurality of upper spraying layers 14;

[0049] One side of the bottom spray layer 13 and the plurality of upper spray layers 14 are provided with corresponding slurry delivery pipeline interfaces 15;

[0050] The plurality of upper spray layers 14 and the bottom spray layer 13 are arranged in a staggered manner.

[0051] The bottom spray layer 13 and the upper spray layer 14 are both composed of a plurality of existing mature spray devices in a staggered array, and the arrangement density of the spray heads in the spray device at the bottom spray layer 13 is greater than the arrangement density of the spray heads in the upper spray layer 14, so as to perform intensive spraying operation on the flue gas just entering the desulfurization tower body 1 to reduce the content of sulfur dioxide therein;

[0052] By setting the bottom spray layer 13 with a higher spray density at the bottom, the operating load of the corresponding slurry delivery pump is reduced and the rising path of the smoke is extended, so that the water content of the smoke can be gradually reduced due to the effect of gravity during the rising process, avoiding excessive water content in the smoke due to insufficient rising distance, thereby affecting the actual working effect of the large expansion cooling layer 300 and the demisting layer 400.

[0053] Specifically, a plurality of demisters 10 are disposed inside the demister layer 400 , and two first observation and maintenance ports 16 are disposed on the outer surface of the demister layer 400 .

[0054] Specifically, a plurality of second observation and maintenance openings 17 are disposed on one side of the spraying area 200 , and the locations of the plurality of second observation and maintenance openings 17 correspond to the locations of the plurality of upper spraying layers 14 .

[0055] Through the coordinated setting of the first observation and maintenance port 16 and the second observation and maintenance port 17, external relevant personnel are assisted to observe and detect the working status and the status of each facility inside the desulfurization tower body 1, so as to timely discover possible problems and facilitate subsequent relevant personnel to repair each facility through the corresponding observation and maintenance port.

[0056] Please continue reading Figure 3 ,like Figure 3 As shown, it is a partial cross-sectional view of the other side of the desulfurization tower body of the utility model;

[0057] Specifically, the side inlet 2 is disposed between the slurry pool 11 and the bottom spray layer 13 , and the side inlet 2 is connected to the desulfurization tower body 1 through an inlet bracket 21 .

[0058] The presence of the inlet bracket 21 makes the connection between the side inlet 2 and the desulfurization tower body 1 more stable, thereby preventing the side inlet 2 from being separated from the desulfurization tower body 1.

[0059] Please continue reading Figure 4 ,like Figure 4 As shown, it is a schematic diagram of the overall structure of the expansion cooling layer 300 of the utility model;

[0060] Specifically, the expansion cooling layer 300 includes a connection change zone 18 and a heat exchange zone 19 , and the expansion cooling layer 300 is respectively connected to the spray zone 200 and the demisting layer 400 of the desulfurization tower body 1 through the connection change zone 18 .

[0061] The angle between the connection change zone 18 and the heat exchange zone 19 should not be less than 30°, so that the condensed water droplets can normally gather downward and drip back into the slurry pool 11. At the same time, the inner wall of the connection change zone 18 can be laid with smooth and more corrosion-resistant ceramic facilities to increase the smoothness of the inner wall of the connection change zone 18, thereby preventing the condensed water droplets from stagnating on its surface and reducing its corrosion rate.

[0062] Please continue reading Figure 5 and Figure 6 ,like Figure 5 and Figure 6 As shown, Figure 5 This is a transverse cross-sectional view of the expansion cooling layer 300 of the utility model. Figure 6 This is a schematic structural diagram of a heat exchange zone in another embodiment of the utility model;

[0063] Specifically, the heat exchange area 19 is formed by a circular array of a plurality of smoke passages 191 for circulating smoke. Specifically, a heat exchange channel 192 for air circulation is formed between the outer surfaces of any two adjacent smoke passages 191 .

[0064] During operation, when the flue gas with a relatively high temperature gradually rises from the bottom of the desulfurization tower to the expansion cooling layer 300, it enters the interior of the heat exchange zone 19 along each flue gas passage 191. The circumference of the inner and outer surfaces of the heat exchange zone 19 is increased in the circumferential direction by continuously bending the long flue gas passage 191 to increase the heat exchange area between the flue gas and the air in the heat exchange zone 19. The flue gas with a relatively high temperature passes through the flue gas passage 191, and the outside air flows through the heat exchange channel 192 formed by two adjacent flue gas passages 191. The temperature difference between the flue gas and the air is used to accelerate the cooling speed of the flue gas, thereby precipitating the saturated water vapor in the flue gas into droplets and reducing the water content in the flue gas. At the same time, a cooling fan can be set around the heat exchange zone 19 to increase the heat exchange effect between the air and the flue gas and maintain its heat exchange efficiency.

[0065] On the other hand, a connecting groove corresponding to the heat exchange channel 192 can be opened at the connection area 18 to reduce the shielding effect of the connection area 18 on the heat exchange channel 192, increase the circulation effect of air therein, and thus improve the heat exchange effect;

[0066] like Figure 5 and Figure 6 As shown, two non-adjacent sides of the heat exchange channel 192 can be arranged in parallel with each other or in a non-parallel symmetrical arrangement to appropriately adjust the width of the smoke or air inlet, and no excessive restrictions are made here.

[0067] Specifically, a fixing base 4 for auxiliary fixing is further provided at the bottom of the desulfurization tower body 1, and the desulfurization tower body 1 is fixedly connected to the fixing base 4 by anchor nails.

[0068] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

[0069] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of wet desulfurization tower structure with low flue gas moisture content, characterized in that: The desulfurization tower body (1) comprises a side inlet (2) for flue gas to enter the desulfurization tower body (1), and a flue outlet (3) for flue gas to be discharged is provided at the top of the desulfurization tower body (1); The desulfurization tower body (1) is divided into a slurry layer (100), a spraying area (200) and a demisting layer (400) from bottom to top, wherein: The slurry layer (100) is located in the bottom area of ​​the desulfurization tower body (1) and is used to store desulfurization slurry; The spraying area (200) is connected to the slurry layer (100) via a slurry conveying pipeline, and is used to spray desulfurization slurry onto the flue gas introduced into the desulfurization tower body (1); The demisting layer (400) is located below the flue outlet (3) and performs a demisting operation on the flue gas after passing through the spraying area (200); The desulfurization tower body (1) is also provided with an expansion cooling layer (300) for increasing the heat exchange area between flue gas and air. The expansion cooling layer (300) is arranged between the spraying area (200) and the demisting layer (400).

2. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 1 is characterized in that: The slurry layer (100) comprises a slurry pool (11), and one side of the slurry pool (11) is provided with a liquid replacement port (12) for auxiliary liquid replacement and an output port for outputting desulfurized slurry to the outside.

3. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 2 is characterized in that: The spraying area (200) comprises a bottom spraying layer (13) and a plurality of upper spraying layers (14); One side of the bottom spray layer (13) and the plurality of upper spray layers (14) is provided with a corresponding slurry delivery pipeline interface (15); The plurality of upper spray layers (14) and the bottom spray layer (13) are arranged in a staggered manner.

4. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 3 is characterized in that: A plurality of demisters (10) are arranged inside the demisting layer (400), and two first observation and maintenance ports (16) are arranged on the outer surface of the demisting layer (400).

5. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 4 is characterized in that: A plurality of second observation and maintenance openings (17) are arranged on one side of the spraying area (200), and the arrangement positions of the plurality of second observation and maintenance openings (17) correspond to the arrangement positions of the plurality of upper spraying layers (14).

6. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 5 is characterized in that: The side inlet (2) is arranged between the slurry pool (11) and the bottom spray layer (13), and the side inlet (2) is connected to the desulfurization tower body (1) through an inlet bracket (21).

7. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 6 is characterized in that: The expansion cooling layer (300) comprises a connection change zone (18) and a heat exchange zone (19), and the expansion cooling layer (300) is respectively connected to the spray zone (200) and the demisting layer (400) of the desulfurization tower body (1) through the connection change zone (18).

8. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 7 is characterized in that: The heat exchange area (19) is formed by a ring array of a plurality of smoke passages (191) for circulating smoke, and the plurality of smoke passages (191) are arranged at intervals in the circumferential direction.

9. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 8 is characterized in that: A heat exchange channel (192) capable of being used for air circulation is formed between the outer surfaces of any two adjacent smoke passages (191).

10. The novel wet desulfurization tower structure with low flue gas moisture content according to claim 9 is characterized in that: A fixing base (4) for auxiliary fixing is also provided at the bottom of the desulfurization tower body (1), and the desulfurization tower body (1) is fixedly connected to the fixing base (4) via anchor nails.

Images