Flue gas desulfurization equipment for thermal power plant

Abstract

The invention belongs to the field of flue gas purification equipment, and particularly relates to thermal power plant flue gas desulfurization equipment, the thermal power plant flue gas desulfurization equipment comprises a stirring assembly, a circulating assembly, a gas outlet pipe, a gas supply pipe, a shell and a grating component, the shell is internally provided with a containing cavity, the grating component is fixed in the containing cavity, the gas supply pipe is connected with the shell, and the stirring assembly is arranged in the containing cavity. The stirring assembly comprises a stirring component and a rotating wheel connected with the stirring component, a stirring cavity is formed in the center of the grating component, at least part of the rotating wheel is arranged in the stirring cavity, the circulating assembly comprises a first spraying component and a circulating component, and the input end of the circulating component is connected with the bottom of the shell. The output end of the circulating component is connected with the first spraying component, the first spraying component is arranged above the grating component and the stirring component, the air supply pipe is connected with the shell and extends into the containing cavity, and the air supply pipe is arranged at the lower end of the grating component. According to the flue gas desulfurization equipment for the thermal power plant, the mixing efficiency of flue gas and desulfurization liquid is improved, and the desulfurization effect of the flue gas is improved.

Description

Technical Field

[0001] The invention belongs to the field of flue gas purification equipment, and in particular relates to flue gas desulfurization equipment for a thermal power plant. Background Art

[0002] Desulfurization refers to the process of removing sulfur from fuel before combustion and desulfurization before flue gas emission. It is one of the important technical measures to prevent and control air pollution. Before flue gas emission in thermal power plants, it is necessary to desulfurize the flue gas. Thermal power plants heat water to generate steam when fuel is burned, converting the chemical energy of the fuel into thermal energy. The steam pressure drives the turbine to rotate, and the thermal energy is converted into mechanical energy. Then the turbine drives the generator to rotate and converts the mechanical energy into electrical energy. A large amount of sulfur-containing waste gas will be generated in the process of thermal power generation. These waste gases need to be discharged after desulfurization operation to reduce the pollution of waste gas to the environment. The desulfurization of waste gas includes the step of spray purification. The absorption slurry is sprayed into the spray tower through the nozzle atomization, dispersed into fine droplets to form a huge gas-liquid contact surface, thereby covering the entire cross-section of the spray tower. Through these absorption slurries, most of the impurities in the waste gas and the preliminary desulfurization operation can be removed. The waste gas treated by the spray device will be introduced into the interior of the next purification treatment device for further purification and desulfurization treatment.

[0003] A circular tube grid packing absorption tower is proposed in the related art, which sprays the desulfurization liquid by alternately arranging the spray layer and the grid, but the desulfurization effect is poor. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a flue gas desulfurization device for a thermal power plant, which improves the mixing efficiency of flue gas and desulfurization liquid and improves the desulfurization effect of flue gas.

[0006] The flue gas desulfurization equipment for a thermal power plant according to an embodiment of the present invention comprises:

[0007] An air supply pipe, a shell and a grille component, wherein the shell has a receiving cavity, the grille component is fixed in the receiving cavity, the air supply pipe is connected to the shell, and the outlet of the air supply pipe is connected to the bottom of the receiving cavity;

[0008] A stirring assembly, the stirring assembly comprises a stirring member and a rotating wheel connected to the stirring member, a stirring chamber is provided at the center of the grid member, and the rotating wheel is at least partially arranged in the stirring chamber;

[0009] A circulation component, the circulation component comprising a first spray component and a circulation component, the input end of the circulation component is arranged to be connected to the bottom of the shell, the output end of the circulation component is connected to the first spray component, and the first spray component is arranged above the grille component and the stirring component;

[0010] An air outlet pipe, the air supply pipe is connected to the shell and extends into the accommodating cavity, and the air supply pipe is arranged at the lower end of the grille component.

[0011] The flue gas desulfurization equipment for a thermal power plant according to the embodiment of the present invention improves the mixing efficiency of flue gas and desulfurization liquid, and improves the desulfurization effect of flue gas.

[0012] In some embodiments, the stirring chamber is in a shape of a hemisphere, a truncated cone, or a cylinder.

[0013] In some embodiments, the circulation component further includes a second spray component disposed in the accommodating chamber, the second spray component is disposed between the air supply pipe and the grille component, and the circulation component is connected to the second spray component.

[0014] In some embodiments, there is a first preset distance A between the grille component and the first spray component, and 20 mm ≤ A ≤ 200 mm.

[0015] In some embodiments, the flue gas desulfurization equipment of a thermal power plant further includes a rectifying grid and a third spray component arranged in the accommodating cavity, and the rectifying grid is arranged below the third spray component, and the third spray component is connected to the circulation component.

[0016] In some embodiments, the flue gas desulfurization equipment of a thermal power plant further includes a wind return component, which is arranged on the top of the shell, and the output end of the wind return component faces the third spray component.

[0017] In some embodiments, the first spray component, the second spray component and the third spray component all include a nozzle and a connecting pipe, the output end of the nozzle faces upward, one end of the connecting pipe is connected to the nozzle, and the other end of the connecting pipe is connected to the circulation component.

[0018] In some embodiments, the grid component may be cylindrical or truncated cone-shaped.

[0019] In some embodiments, the stirring component includes a driving member, a conveyor belt and a rotating shaft. The conveyor belt is sleeved on the output end of the driving member and one end of the rotating shaft. The rotating shaft extends into the accommodating cavity and is connected to the rotating wheel.

[0020] In some embodiments, a distance between the third spray component and the first spray component is greater than a distance between the second spray component and the first spray component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a flue gas desulfurization device for a thermal power plant according to an embodiment of the present invention.

[0022] Figure 2 1 is a top view of a rectifying grid according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] Gas supply pipe 1,

[0025] Shell 2, accommodating chamber 21,

[0026] Grid component 3, stirring chamber 31,

[0027] Exhaust pipe 4,

[0028] Stirring assembly 5, rotating wheel 51, stirring member 52, driving member 521, conveyor belt 522, rotating shaft 523,

[0029] The first spraying part 6, the first spray head 61, the first connecting pipe 62,

[0030] The second spraying part 7, the second spray head 71, the second connecting pipe 72,

[0031] The third spraying component 8, the third spray head 81, the third connecting pipe 82,

[0032] Rectifying grid 9, wind return part 10. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] refer to Figure 1 and Figure 2As shown, the flue gas desulfurization equipment of a thermal power plant according to an embodiment of the present invention includes: a stirring component 5, a circulation component, an air outlet pipe 4, an air supply pipe 1, a shell 2 and a grille component 3. The shell 2 has a accommodating chamber 21, the grille component 3 is fixed in the accommodating chamber 21, the air supply pipe 1 is connected to the shell 2, and the outlet of the air supply pipe 1 is connected to the bottom of the accommodating chamber 21. The stirring component 5 includes a stirring component 52 and a runner 51 connected to the stirring component 52. A stirring chamber 31 is provided at the center of the grille component 3, and the runner 51 is at least partially arranged in the stirring chamber 31. The circulation component includes a first spray component 6 and a circulation component. The input end of the circulation component is arranged to be connected to the bottom of the shell 2, and the output end of the circulation component is connected to the first spray component 6, and the first spray component 6 is arranged above the grille component 3 and the stirring component 52. The air supply pipe 1 is connected to the shell 2 and extends into the accommodating chamber 21, and the air supply pipe 1 is arranged at the lower end of the grille component 3.

[0035] The flue gas desulfurization equipment for a thermal power plant according to the embodiment of the present invention improves the mixing efficiency of flue gas and desulfurization liquid, and improves the desulfurization effect of flue gas.

[0036] Specifically, the shell 2 extends in the up-down direction, the grille component 3 is arranged in the accommodating chamber 21, the flue gas enters the accommodating chamber 21 from the air supply pipe 1 below, and the flue gas flows upward and contacts the liquid medicine sprayed by the first spray component 6 to perform a desulfurization reaction.

[0037] The stirring member 52 drives the wheel 51 to rotate to mix the smoke and the sprayed liquid medicine. For example, the wheel 51 rotates to move a portion of the smoke downward, thereby increasing the flow path of the smoke in the containing chamber 21 and improving the mixing effect of the liquid medicine and the smoke. The collision probability between the liquid medicine molecules and the smoke molecules is increased, the effect of the mixing reaction is improved, and the liquid medicine and the smoke are fully reacted to reduce the amount of liquid medicine used.

[0038] The input end of the circulation component is connected to the bottom of the accommodating chamber 21 to output the liquid medicine at the bottom of the accommodating chamber 21 to the first spray component 6. The liquid medicine sprayed by the first spray component 6 is stirred by the wheel 51 and impacts the grid component 3, causing the liquid medicine to be further dispersed, thereby increasing the probability of the liquid medicine mixing with the flue gas.

[0039] The flue gas desulfurization equipment for thermal power plants of the embodiment of the present invention is provided with a stirring component 52 and a grid, so that the sprayed liquid medicine can not only be stirred by the wheel 51, but also impact the grid component 3, so that the liquid medicine is further dispersed. This dispersion effect further increases the probability of the liquid medicine mixing with the flue gas, improves the mixing efficiency of the flue gas and the desulfurization liquid, reduces the amount of liquid medicine used, and improves the desulfurization effect of the flue gas.

[0040] In some embodiments, the shape of the stirring chamber 31 is any one of a hemispherical shape, a truncated cone shape or a cylindrical shape, so that the most different shapes of the stirring chamber 31 can be selected according to the specific flue gas desulfurization reaction conditions.

[0041] In some embodiments, the circulation component further includes a second spray component 7 disposed in the accommodating chamber 21 , the second spray component 7 is disposed between the air supply pipe 1 and the grille component 3 , and the circulation component is connected to the second spray component 7 .

[0042] The second spraying part 7 is arranged below the grid part 3. When the wheel 51 rotates to make the flue gas move downward, the flue gas moving downward contacts the first spraying part 6, and the liquid medicine sprayed by the second spraying part 7 contacts and reacts with the flue gas to perform desulfurization. Furthermore, a rectifying grid 9 can be arranged below the second spraying part 7 to set a packing layer and rectify the flue gas. At the same time, the liquid medicine sprayed by the second spraying part 7 impacts the rectifying grid 9 to further disperse the liquid medicine. This dispersion effect further increases the probability of the liquid medicine mixing with the flue gas, improves the mixing efficiency of the flue gas and the desulfurization liquid, reduces the amount of liquid medicine used, and improves the desulfurization effect of the flue gas.

[0043] In some embodiments, there is a first preset distance A between the grille component 3 and the first spray component 6, and 20 mm ≤ A ≤ 200 mm.

[0044] Specifically, there is a first preset distance A between the grille component 3 and the first spray component 6. By setting the preset distance, it is avoided that the grille component 3 and the first spray component 6 are too close to each other, which leads to a small reaction path between the flue gas and the first spray component 6 and insufficient reaction. At the same time, it is also avoided that the first spray component 6 and the grille component 3 are too far away from each other, which leads to the inability of the liquid medicine to immediately impact the grille, thereby reducing the dispersion effect of the liquid medicine.

[0045] In some embodiments, the flue gas desulfurization equipment of a thermal power plant further includes a rectifying grid 9 and a third spraying component 8 arranged in the accommodating chamber 21, and the rectifying grid 9 is arranged below the third spraying component 8, and the third spraying component 8 is connected to the circulation component.

[0046] The third spraying part 8 is usually connected to the circulation part, and the circulation part extracts the liquid medicine at the bottom of the accommodating chamber 21 and transports it to the third spraying part 8 for spraying. This circulation design can make full use of the liquid medicine, improve the desulfurization efficiency, and reduce the operating cost.

[0047] Through the guidance of the rectifying grid 9, the flue gas is made more uniform and stable in the upward flow process. The flue gas can contact the sprayed liquid medicine more fully, thereby improving the desulfurization efficiency. At the same time, the liquid medicine sprayed by the third spraying part 8 contacts the rectifying grid 9 arranged between the third spraying part 8 and the first spraying part 6, so that the liquid medicine is further dispersed. This dispersion effect further increases the probability of mixing the liquid medicine with the flue gas, improves the mixing efficiency of the flue gas and the desulfurization liquid, reduces the amount of liquid medicine used, and improves the desulfurization effect of the flue gas.

[0048] In some embodiments, the flue gas desulfurization equipment of a thermal power plant further includes a wind return component 10 , which is disposed on the top of the shell 2 , and the output end of the wind return component 10 faces the third spray component 8 .

[0049] Specifically, the wind return element 10 is arranged near the exhaust pipe 4, and the output end of the wind return element 10 outputs downward to move the flue gas downward. At the same time, the impeller 51 can be rotated forward or reversed to move the flue gas downward, or move upward to make the flue gas turbulent, thereby improving the reaction path or mixing effect of the flue gas and the chemical solution, thereby improving the desulfurization effect.

[0050] For example, the impeller 51 is rotated forward to move the flue gas downward. At the same time, the output end of the wind return component 10 outputs downward to move the flue gas downward. The flue gas in different areas can flow back and forth, thereby improving the reaction path between the flue gas and the chemical solution and further improving the desulfurization effect.

[0051] Alternatively, the impeller 51 is reversed to move the flue gas upward, and at the same time, the output end of the wind return member 10 outputs downward, and the flue gas at the upper and lower places flows in opposite directions, increasing the turbulence between the flue gases, improving the mixing effect of the flue gas and the chemical solution, and further improving the desulfurization effect.

[0052] In some embodiments, the first spray component 6, the second spray component 7 and the third spray component 8 all include a nozzle and a connecting pipe, the output end of the nozzle faces upward, one end of the connecting pipe is connected to the nozzle, and the other end of the connecting pipe is connected to the circulation component.

[0053] Specifically, the first spray component 6 includes a first spray head 61 and a first connecting pipe 62, the outlet of the first connecting pipe 62 is connected to the inlet of the first spray head 61, the second spray component 7 includes a second spray head 71 and a second connecting pipe 72, the outlet of the second connecting pipe 72 is connected to the inlet of the second spray head 71, and the third spray component 8 includes a third spray head 81 and a third connecting pipe 82. The outlet of the third connecting pipe 82 is connected to the inlet of the third spray head 81, and the inlets of the first connecting pipe 62, the second connecting pipe 72 and the third connecting pipe 82 are connected to the output end of the circulation unit.

[0054] The circulation component will continuously extract the liquid medicine at the bottom of the accommodating chamber 21 and transport it to the nozzles of each spray component through the connecting pipe. The nozzle sprays the liquid medicine in the form of mist or small droplets into the flue gas flowing above. As the flue gas continues to flow, it will fully contact and react with the sprayed liquid medicine, thereby achieving the purpose of desulfurization. The output end of the nozzle faces upward, and the liquid medicine is sprayed from the top of the nozzle to cover and contact the flue gas flowing above, increasing the contact area between the liquid medicine and the flue gas, thereby increasing the size of the reaction area and improving the desulfurization effect.

[0055] In some embodiments, the shape of the grille component 3 can be cylindrical or truncated cone, and the truncated cone-shaped grille component 3 has a gradually changing cross-sectional area, which can optimize the flow path of the flue gas. The circulating flue gas in the central area of ​​the accommodating chamber 21 is rectified, and the truncated cone-shaped grille component 3 can also guide the flue gas to slow down and diffuse, which is conducive to more sufficient contact and reaction between the pollutants in the flue gas and the spray liquid. The cylindrical grille component 3 has a low manufacturing cost. The cylindrical structure can provide a stable flue gas flow path, so that the flue gas can maintain a relatively uniform velocity and pressure distribution when passing through the grille, which is conducive to sufficient contact and mixing between the flue gas and the spray liquid, thereby improving the desulfurization efficiency.

[0056] In some embodiments, the stirring member 52 includes a driving member 521, a conveyor belt 522 and a rotating shaft 523. The output end of the driving member 521 and one end of the rotating shaft 523 are sleeved with the conveyor belt 522. The rotating shaft 523 extends into the accommodating cavity 21 and is connected to the rotating wheel 51. The driving member 521 can be an existing driving device or a driving member. The driving member 521 drives the rotating shaft 523 to rotate through the transmission belt, and then the rotating shaft 523 drives the rotating wheel 51 to rotate, thereby improving the stability of the operation of the equipment. A sealed bearing can be provided between the rotating shaft 523 and the housing 2 for sealing.

[0057] In some embodiments, the distance between the third spray part 8 and the first spray part 6 is greater than the distance between the second spray part 7 and the first spray part 6. Then, the flue gas is rectified and reacts with the liquid medicine, and then the flue gas is turbulent and reversely flows, thereby improving the reaction effect.

[0058] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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 limiting the present invention.

[0059] 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 invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; 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.

[0061] In the present invention, 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.

[0062] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A flue gas desulfurization equipment for a thermal power plant, characterized in that: include: An air supply pipe, a shell and a grille component, wherein the shell has a receiving cavity, the grille component is fixed in the receiving cavity, the air supply pipe is connected to the shell, and the outlet of the air supply pipe is connected to the bottom of the receiving cavity; A stirring assembly, the stirring assembly comprises a stirring component and a rotating wheel connected to the stirring component, a stirring chamber is provided at the center of the grid component, and the rotating wheel is at least partially arranged in the stirring chamber; A circulation component, the circulation component comprising a first spray component and a circulation component, the input end of the circulation component is arranged to be connected to the bottom of the shell, the output end of the circulation component is connected to the first spray component, and the first spray component is arranged above the grille component and the stirring component; An air outlet pipe, the air supply pipe is connected to the shell and extends into the accommodating cavity, and the air supply pipe is arranged at the lower end of the grille component.

2. The flue gas desulfurization equipment for thermal power plants according to claim 1, characterized in that: The stirring chamber has a shape of any one of a hemispherical shape, a truncated cone shape or a cylindrical shape.

3. The flue gas desulfurization equipment for thermal power plants according to claim 1, characterized in that: The circulation component further comprises a second spray component arranged in the accommodating chamber, the second spray component is arranged between the air supply pipe and the grille component, and the circulation component is connected to the second spray component.

4. The flue gas desulfurization equipment for thermal power plants according to claim 1, characterized in that: There is a first preset distance A between the grille component and the first spray component, and 20mm≤A≤200mm.

5. The flue gas desulfurization equipment for thermal power plants according to claim 3, characterized in that: It also includes a rectifying grid and a third spraying component arranged in the accommodating chamber, wherein the rectifying grid is arranged below the third spraying component, and the third spraying component is connected to the circulation component.

6. The flue gas desulfurization equipment for thermal power plants according to claim 5, characterized in that: It also includes a wind return component, which is arranged on the top of the shell, and the output end of the wind return component faces the third spray component.

7. The flue gas desulfurization equipment for thermal power plants according to claim 5, characterized in that: The first spray component, the second spray component and the third spray component all include a spray head and a connecting pipe, the output end of the spray head faces upward, one end of the connecting pipe is connected to the spray head, and the other end of the connecting pipe is connected to the circulation component.

8. The flue gas desulfurization equipment for thermal power plants according to claim 1, characterized in that: The shape of the grid component can be cylindrical or truncated cone.

9. The flue gas desulfurization equipment for thermal power plants according to claim 1, characterized in that: The stirring component comprises a driving member, a conveyor belt and a rotating shaft. The conveyor belt is sleeved on the output end of the driving member and one end of the rotating shaft. The rotating shaft extends into the accommodating cavity and is connected to the rotating wheel.

10. The flue gas desulfurization equipment for thermal power plants according to any one of claims 5 to 7, characterized in that: The distance between the third spray component and the first spray component is greater than the distance between the second spray component and the first spray component.

Images