Flue gas desulfurization cooling system
By using a quicklime spraying device and cooling pipes combined with temperature control in the flue gas desulfurization and cooling system, the problem of high-temperature flue gas damaging the dust collector bags was solved, achieving effective desulfurization and cooling of the flue gas, extending the service life of the dust collector bags, and reducing production costs.
Patent Information
- Application Number
- CN202422639473.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Traditional high-temperature desulfurization processes damage dust collector bags due to flue gas, leading to a shortened service life and increased production costs.
The flue gas is desulfurized by a quicklime spraying device and then cooled by a cooling pipe before entering the dust collector bag. The system is equipped with a temperature sensor and a fan to control the flue gas path and cooling effect, and the amount of quicklime sprayed is adjusted according to the sulfur dioxide concentration.
It effectively reduces flue gas temperature, minimizes damage to dust collector bags, extends their service life, and lowers production costs.
Smart Images
Figure CN223747307U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of flue gas treatment, and in particular to a flue gas desulfurization and cooling system. BACKGROUND
[0002] With the increasing global awareness of environmental protection, the emission standards of sulfur dioxide and dust in high-emission industries such as coal-fired power plants and chemical plants are becoming increasingly stringent. In order to avoid excessive sulfur dioxide or dust, it is necessary to desulfurize and remove dust from the flue gas before it is discharged.
[0003] The traditional desulfurization and dust removal technology is high-temperature desulfurization, and then the high-temperature flue gas enters the dust removal bag for dust removal. However, the flue gas with too high temperature is easy to cause damage to the dust removal bag, reduce the service life of the dust removal bag, and increase the production cost. This is the deficiency of the prior art. CONTENT OF THE INVENTION
[0004] One of the technical problems to be solved by the present disclosure is how to avoid damage to the dust removal bag caused by too high temperature of the flue gas.
[0005] To solve the above technical problems, the present disclosure provides a flue gas desulfurization and cooling system, which comprises: a flue gas inlet connected to a front end interface for receiving flue gas transmitted by the front end interface; a flue gas outlet connected to a rear end interface for transmitting the flue gas to the rear end interface; a box body comprising an upper box body, a first end of the upper box body being connected to the flue gas inlet, a second end of the upper box body being connected to the flue gas outlet, for connecting and supporting the system; a lime milk spraying device comprising a lime milk spraying pipeline arranged inside the box body, for spraying lime milk to desulfurize the flue gas; a valve arranged inside the upper box body, for separating the upper box body into a first upper box body and a second upper box body, wherein the first upper box body is connected to the flue gas inlet, and the second upper box body is connected to the flue gas outlet; and a cooling pipe, a first end of the cooling pipe being connected to the first upper box body, a second end of the cooling pipe being connected to the second upper box body, for cooling the flue gas.
[0006] In some embodiments, the lime milk spraying device comprises: a fan frame fixed on the box body; fan blades arranged on the fan frame, for rotating with the fan blades when the flue gas flows, for mixing the sprayed lime milk with the flue gas; and a lime milk spraying pipeline arranged on the fan blades, for spraying the lime milk.
[0007] In some embodiments, the system further comprises: a sulfur dioxide concentration detection device arranged at the flue gas inlet, for detecting the concentration of sulfur dioxide in the flue gas.
[0008] In some embodiments, the system comprises at least two lime milk spraying devices, and the number of the lime milk spraying devices turned on is controlled based on the concentration of sulfur dioxide in the flue gas.
[0009] In some embodiments, the valve is an electric valve, and the system further comprises a first temperature sensor arranged in the first upper tank and configured to detect a temperature of the flue gas in the first upper tank, and a controller configured to close the electric valve when the temperature of the flue gas in the first upper tank is higher than a first temperature threshold, so that the flue gas flows into the cooling pipe.
[0010] In some embodiments, the system further comprises a second temperature sensor arranged in the second upper tank and configured to detect a temperature of the flue gas in the second upper tank, and a cooling fan arranged at one side of the cooling pipe and configured to cool the cooling pipe when the temperature of the flue gas in the second upper tank is higher than a second temperature threshold.
[0011] In some embodiments, the system comprises at least two cooling fans, and the number of the cooling fans that are turned on is controlled based on the temperature of the flue gas in the second upper tank.
[0012] In some embodiments, the system further comprises a first unloader arranged below the upper tank and configured to discharge the precipitated dust, and a first dust interface connected to the first unloader and connected below a dust bag and configured to receive the dust.
[0013] In some embodiments, the system further comprises a first manual valve arranged between the first unloader and the upper tank and configured to control the discharge of the dust.
[0014] In some embodiments, the cooling pipe comprises a first cooling pipe and a second cooling pipe, and a lower tank is arranged between the first cooling pipe and the second cooling pipe, and the lower tank is arranged below a second unloader configured to discharge the dust, a second dust interface connected to the second unloader and connected below a dust bag and configured to receive the dust, and a second manual valve arranged between the second unloader and the lower tank and configured to control the discharge of the dust.
[0015] Through the above technical solutions, the flue gas desulfurization and cooling system provided by the present disclosure can desulfurize the flue gas, then cool the flue gas in the cooling pipe, and then discharge the cooled flue gas from the flue gas outlet to the rear interface and then into the bag dust collector, so that the damage to the dust removal bag can be effectively reduced, the service life of the dust removal bag can be improved, and the production cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, a brief introduction to the drawings needed to be used in the embodiments or prior art description will be given below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.
[0017] Figure 1is a structural schematic diagram of a flue gas desulfurization and cooling system disclosed by an embodiment of the present disclosure;
[0018] Figure 2 is a structural schematic diagram of another flue gas desulfurization and cooling system disclosed by an embodiment of the present disclosure;
[0019] Figure 3 is a structural schematic diagram of a lime spraying device disclosed by an embodiment of the present disclosure;
[0020] Legend:
[0021] 1, flue gas outlet; 2, second temperature sensor; 3, valve; 4, first temperature sensor; 5, upper box body; 6, cooling fan; 7, lime spraying device; 8, flue gas inlet; 9, first manual valve; 10, first discharger; 11, first dust interface; 12, first cooling pipe; 13, second cooling pipe; 14, lower box body; 15, second manual valve; 16, second discharger; 17, second dust interface; 701, fan frame; 702, fan blade; 703, lime spraying pipeline. DETAILED DESCRIPTION
[0022] The embodiments of the present disclosure will be further described in detail below with reference to the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure, and the present disclosure can be implemented in many different forms, and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0023] The present disclosure provides these embodiments in order to make the present disclosure thorough and complete, and fully express the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specified, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these embodiments should be interpreted as merely exemplary, and not as a limitation.
[0024] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like are merely for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0025] Further, "first", "second", and similar words used in the present disclosure do not indicate any order, number or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.
[0026] It should also be noted that in the description of the present disclosure, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. When it is described that a specific device is located between the first device and the second device, there can be or can not be an intermediate device between the specific device and the first device or the second device.
[0027] All terms used in the present disclosure have the same meaning as understood by those skilled in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted to have meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or excessively formalized sense, unless specifically defined here.
[0028] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but where appropriate, the techniques, methods, and devices should be considered as part of the specification.
[0029] Figure 1 is a structural schematic diagram of a flue gas desulfurization and cooling system disclosed by an embodiment of the present disclosure, as Figure 1 shown, the system comprises: a flue gas inlet 8 connected to a front end interface, for receiving flue gas transmitted by the front end interface; a flue gas outlet 1 connected to a rear end interface, for transmitting flue gas to the rear end interface; a box body, comprising an upper box body 5, a first end of the upper box body 5 is connected to the flue gas inlet 8, a second end of the upper box body 5 is connected to the flue gas outlet 1, for communicating and supporting the system; a lime milk spraying device 7, comprising a lime milk spraying pipeline 703, arranged inside the box body, for spraying lime milk to desulfurize the flue gas; a valve 3, arranged inside the upper box body 5, separating the upper box body 5 into a first upper box body and a second upper box body, wherein the first upper box body is connected to the flue gas inlet 8, and the second upper box body is connected to the flue gas outlet 1; and a cooling pipe, a first end of the cooling pipe is connected to the first upper box body, and a second end of the cooling pipe is connected to the second upper box body, for cooling the flue gas.
[0030] The cooling pipe can adopt various types of cooling methods, such as introducing cold water or cold air into the cooling pipe to achieve the cooling effect, or other forms of cooling according to the actual situation.
[0031] In the system, the upper box 5 is divided into two parts by the valve 3. When the flue gas flows to the position of the valve 3 in the first upper box, it flows into the cooling pipe, and then flows out from the cooling pipe to the second upper box, and then flows out from the flue gas outlet 1.
[0032] In the specific implementation, after the flue gas enters the box from the front end interface, the lime slurry sprayed by the lime slurry spraying device 7 in the box is used for desulfurization of the flue gas. The desulfurized flue gas is not directly discharged from the box, but is cooled in the cooling pipe, and then is discharged from the flue gas outlet 1 to the rear end interface. The discharged flue gas will enter the bag dust collector. The higher the temperature of the gas treated during the bag dust collection, the more likely it is to cause damage to the dust collection bag. The system not only desulfurizes the flue gas, but also cools the flue gas, thereby reducing the temperature of the discharged flue gas, so as to effectively reduce the damage to the dust collection bag, prolong the service life of the dust collection bag, and reduce the production cost.
[0033] Figure 3 is a structural schematic diagram of the lime slurry spraying device 7 disclosed in the embodiments of the present disclosure, as Figure 3 shown, the lime slurry spraying device 7 includes: a fan frame 701 fixed on the box; fan blades 702 arranged on the fan frame 701, which rotate when the flue gas flows, and are used to mix the sprayed lime slurry with the flue gas; and a lime slurry spraying pipeline 703 arranged on the fan blades 702, which is used to spray the lime slurry.
[0034] The lime slurry spraying device 7 disclosed in the present disclosure adopts a non-powered structure. When the flue gas flows, the fan blades 702 are rotated by the airflow, which makes the lime slurry spraying more uniform and avoids the cost of providing additional power. When installed, the lime slurry spraying device 7 can be installed vertically or horizontally on the box, or installed at other angles, which can achieve that the fan blades 702 are rotated by the airflow when the flue gas flows.
[0035] In some embodiments, the system further includes: a sulfur dioxide concentration detection device arranged at the flue gas inlet 8, which is used to detect the concentration of sulfur dioxide in the flue gas.
[0036] It can be understood that when the concentration of sulfur dioxide in the flue gas is different, the amount of slaked lime to be sprayed is also different. Therefore, the system disclosed in the present disclosure is provided with a sulfur dioxide concentration detection device at the flue gas inlet 8, and based on the detection result, the amount of slaked lime to be sprayed can be adjusted. In other embodiments of the present disclosure, the sulfur dioxide concentration detection device can also be arranged at other positions of the first upper box, and the concentration of sulfur dioxide contained in the flue gas before desulfurization can be detected.
[0037] In some embodiments, the system comprises at least two slaked lime spraying devices 7, and the number of slaked lime spraying devices 7 to be opened is controlled based on the concentration of sulfur dioxide in the flue gas.
[0038] It should be noted that the amount of slaked lime to be sprayed can be calculated according to the total amount of flue gas entering the flue gas inlet 8 per unit time and the concentration of sulfur dioxide. First, the total amount of sulfur dioxide entering the flue gas inlet 8 per unit time is calculated according to the total amount of flue gas entering the flue gas inlet 8 per unit time and the concentration of sulfur dioxide. Then, the amount of slaked lime required can be calculated according to the fact that 1 mole of sulfur dioxide consumes 1 mole of slaked lime. Finally, the mass of the corresponding quicklime consumed is calculated according to the molar calculation formula n = m / M, where m is the mass and M is the relative molecular mass. The amount of slaked lime sprayed by each slaked lime spraying device 7 per unit time is constant. Therefore, when the total amount of slaked lime to be sprayed is different, different numbers of slaked lime spraying devices 7 can be opened to desulfurize the flue gas.
[0039] Among them, the total amount of flue gas conveyed into the flue gas desulfurization and cooling system per unit time can be obtained by the system discharging flue gas, or can be obtained by installing a detection device or selecting other ways. The present disclosure does not limit the acquisition of this data.
[0040] In some embodiments, the valve 3 is an electric valve, and the system further comprises a first temperature sensor 4 arranged in the first upper box for detecting the temperature of the flue gas in the first upper box; and a controller for closing the electric valve when the temperature of the flue gas in the first upper box is higher than a first temperature threshold, so that the flue gas flows into the cooling pipe.
[0041] It can be understood that not all flue gas needs to be cooled. In some cases, the temperature of the flue gas is relatively low, for example, when the temperature of the flue gas is less than or equal to a pre-set first temperature threshold, the temperature of the flue gas does not need to be reduced, and the flue gas can be directly discharged to the dust bag for dust removal after desulfurization. Figure 2 is another structural schematic diagram of a flue gas desulfurization and cooling system disclosed in an embodiment of the present disclosure. Please refer to Figure 2, the valve 3 is an electric valve, and a first temperature sensor 4 is arranged in the first upper box to detect the temperature of the flue gas, when the temperature of the flue gas is less than or equal to the first temperature threshold, the electric valve is opened, the flue gas directly enters the second upper box from the first upper box, and does not need to be cooled; when the temperature of the flue gas is higher than the first temperature threshold, the electric valve is closed, and the flue gas flows into the cooling pipe for cooling, so that the paths of flue gas at different temperatures can be adjusted.
[0042] In some embodiments, the system further comprises: a second temperature sensor 2 arranged in the second upper box for detecting the temperature of the flue gas in the second upper box; and a cooling fan 6 arranged on one side of the cooling pipe for cooling the cooling pipe when the temperature of the flue gas in the second upper box is higher than a second temperature threshold.
[0043] It can be understood that the temperature of the cooling pipe may increase after the system works for a period of time, thereby reducing the cooling effect of the flue gas. Therefore, the system is provided with the second temperature sensor 2 in the second upper box for detecting the temperature of the cooled flue gas, if the temperature of the flue gas is detected to be higher than the second temperature threshold, it is considered that the temperature of the flue gas is too high, and the cooling effect of the cooling pipe is reduced, at this time, the cooling fan 6 is turned on, which can effectively cool the cooling pipe.
[0044] In some embodiments, the system comprises at least two cooling fans 6, and the number of the cooling fans 6 turned on is controlled based on the temperature of the flue gas in the second upper box.
[0045] In actual production process, if the number of the cooling fans 6 turned on is too small, the cooling effect may not be enough, and if the number of the cooling fans 6 turned on is too large, resources may be wasted. Therefore, the number of the cooling fans 6 turned on can be adjusted according to the temperature detected by the second temperature sensor 2, for example, one cooling fan 6 is turned on when the second temperature threshold is reached, two cooling fans are turned on when the third temperature threshold is reached, and so on, until all the cooling fans 6 arranged are turned on. The second temperature threshold is less than the third temperature threshold.
[0046] In some embodiments, the system further comprises: a first unloader 10 arranged below the upper box 5 for discharging the precipitated dust; and a first dust interface 11 connected with the first unloader 10 and connected with a dust bag below for receiving the dust.
[0047] It can be understood that dust in the flue gas precipitates at any time, and calcium sulfite dust generated by the reaction of desulfurization lime and sulfur dioxide also precipitates, and the first unloader 10 and the first dust interface 11 are arranged below the upper box 5, and the dust interface is used to fix the dust bag, when the dust precipitates below the upper box 5, it can be discharged into the dust bag through the first unloader 10 and the first dust interface 11.
[0048] In some embodiments, the system further comprises a first manual valve 9 arranged between the first discharger 10 and the upper box 5, for controlling the discharge of the dust.
[0049] When the first discharger 10 needs to be replaced or repaired due to failure, or the dust bag cannot temporarily receive the dust, the first manual valve 9 is closed to temporarily stop the discharge of the dust. After the failure of the first discharger 10 or other positions is solved, the first manual valve 9 is opened to normally discharge the dust.
[0050] In some embodiments, the cooling pipe comprises a first cooling pipe 12 and a second cooling pipe 13, and a lower box 14 is arranged between the first cooling pipe 12 and the second cooling pipe 13. A second discharger 16 is arranged below the lower box 14, for discharging the dust. A second dust interface 17 is connected with the second discharger 16, and a dust bag is connected below the second dust interface 17, for receiving the dust. A second manual valve 15 is arranged between the second discharger 16 and the lower box 14, for controlling the discharge of the dust.
[0051] When the flue gas flows through the lower box 14, dust may still be deposited, so the second discharger 16 and the second dust interface 17 are arranged below the lower box 14 to discharge the dust from the lower box 14. The function of the second manual valve 15 is the same as that of the first manual valve 9, which will not be described here.
[0052] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.
[0053] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.
Claims
1. A flue gas desulfurization and cooling system, characterized in that, The system includes: The flue gas inlet (8) is connected to the front-end interface and is used to receive the flue gas transmitted by the front-end interface; Flue gas outlet (1) is connected to a rear-end interface for transmitting the flue gas to the rear-end interface; The housing includes an upper housing (5), the first end of which is connected to a flue gas inlet (8), and the second end of which is connected to a flue gas outlet (1), for connecting and supporting the system; The quicklime spraying device (7) includes a quicklime spraying pipe (703) which is installed inside the box and is used to spray the quicklime to desulfurize the flue gas; A valve (3) is disposed inside the upper housing (5), dividing the upper housing (5) into a first upper housing and a second upper housing, wherein the first upper housing is connected to the flue gas inlet (8) and the second upper housing is connected to the flue gas outlet (1); and A cooling pipe, the first end of which is connected to the first upper housing and the second end of which is connected to the second upper housing, is used to cool the flue gas.
2. The system according to claim 1, characterized in that, The quicklime spraying device (7) includes: The fan frame (701) is fixed to the housing; Fan blades (702), mounted on the fan frame (701), rotate when the flue gas flows, thereby mixing the sprayed quicklime with the flue gas; and A quicklime spraying pipe (703) is installed on the fan blades (702) for spraying quicklime.
3. The system according to claim 2, characterized in that, The system also includes: A sulfur dioxide concentration detection device is installed at the flue gas inlet (8) to detect the concentration of sulfur dioxide in the flue gas.
4. The system according to claim 3, characterized in that, The system includes at least two of the slaked lime spraying devices (7), and the number of slaked lime spraying devices (7) that are turned on is controlled based on the concentration of sulfur dioxide in the flue gas.
5. The system according to claim 1, characterized in that, The valve (3) is an electric valve, and the system also includes: A first temperature sensor (4) is installed inside the first upper chamber to detect the temperature of the flue gas inside the first upper chamber; and The controller is used to close the electric valve when the temperature of the flue gas in the first upper chamber is higher than a first temperature threshold, so that the flue gas flows into the cooling pipe.
6. The system according to claim 5, characterized in that, The system also includes: A second temperature sensor (2) is installed inside the second upper chamber to detect the temperature of the flue gas inside the second upper chamber; and A cooling fan (6) is installed on one side of the cooling pipe to cool the cooling pipe when the temperature of the flue gas in the second upper chamber is higher than the second temperature threshold.
7. The system according to claim 6, characterized in that, The system includes at least two cooling fans (6), and the number of cooling fans (6) turned on is controlled based on the temperature of the flue gas in the second upper chamber.
8. The system according to claim 1, characterized in that, The system also includes: The first unloader (10), located below the upper housing (5), is used to discharge settled dust; and The first dust inlet (11) is connected to the first unloader (10), and a dust bag is connected below it for receiving the dust.
9. The system according to claim 8, characterized in that, The system also includes: A first manual valve (9) is located between the first unloader (10) and the upper housing (5) to control the discharge of dust.
10. The system according to claim 1, characterized in that, The cooling pipe includes a first cooling pipe (12) and a second cooling pipe (13). A lower housing (14) is disposed between the first cooling pipe (12) and the second cooling pipe (13). Below the lower housing (14) is: The second unloader (16) is located below the lower housing (14) and is used to discharge dust. The second dust inlet (17) is connected to the second unloader (16), and a dust bag is connected below it for receiving the dust; as well as A second manual valve (15) is located between the second unloader (16) and the lower housing (14) to control the discharge of dust.