A method, system, intelligent terminal and storage medium for recovering water vapor in flue gas

Abstract

The present application relates to a method, system, intelligent terminal and storage medium for recovering water vapor in flue gas, and relates to the field of environmental protection technology. The method includes conveying high-temperature flue gas to a flue gas cooling tower through a fan; reducing the temperature of the high-temperature flue gas through the flue gas cooling tower to obtain cooled flue gas; conveying the cooled flue gas to a desulfurization tower, and returning the cooled flue gas to the flue gas inlet of the flue gas cooling tower through a connecting pipe; removing sulfur dioxide from the cooled flue gas through the desulfurization tower, and conveying the cooled flue gas to a flue gas mixing chamber; and extracting outside air through an axial flow fan in the flue gas mixing chamber to reduce the flue gas temperature. The present application has the effect of improving the recovery rate of water vapor in flue gas.

Description

Technical Field

[0001] The present application relates to the field of environmental protection technology, and in particular to a method, system, intelligent terminal and storage medium for recovering water vapor in flue gas. Background Art

[0002] In air pollution control, there are many ways to control flue gas emissions. In the air pollution control system, when the kiln flue gas enters the desulfurization tower, the temperature is too high, about 130°C, and the gas velocity is about 15-18 m / s. When the alkali liquid in the tower meets the flue gas in countercurrent, a large amount of water evaporates and is discharged from the top of the chimney with the flue gas, forming a white and thick flue gas phenomenon, commonly known as the "white smoke" phenomenon.

[0003] Related technologies To solve the "white smoke" phenomenon, it is necessary to cool the flue gas before it enters the desulfurization tower. A pre-cooling tower is set up so that the flue gas enters the pre-cooling tower from bottom to top and contacts with the cooling water from top to bottom through the countercurrent spraying, so that the flue gas outlet temperature is reduced. After that, after the water vapor is recovered by the demister, the flue gas is sent to the desulfurization tower for desulfurization and discharge.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the flue gas temperature entering the desulfurization tower is difficult to control and is prone to being too high, making the flue gas temperature insufficient to meet the requirements for water vapor precipitation, resulting in the "white smoke" phenomenon in subsequent steps. Summary of the invention

[0005] In order to improve the recovery rate of water vapor in flue gas, the present application provides a method, system, intelligent terminal and storage medium for recovering water vapor in flue gas.

[0006] In a first aspect, the present application provides a system for recovering water vapor in flue gas, which adopts the following technical solution:

[0007] A system for recovering water vapor in flue gas, comprising a fan, a flue gas cooling tower, a desulfurization tower, a flue gas mixing chamber and a coolant circulation device;

[0008] The fan is connected to the flue gas cooling tower. The fan is used to transport the high-temperature flue gas to the flue gas cooling tower. The flue gas cooling tower is used to reduce the temperature of the high-temperature flue gas to obtain cooled flue gas.

[0009] The flue gas cooling tower is connected to the desulfurization tower, which is used to remove sulfur dioxide in the cooling flue gas. A connecting pipe is provided between the flue gas inlet and the flue gas outlet of the flue gas cooling tower, and the connecting pipe includes a first pipe near the flue gas inlet, a gas storage container and a second pipe near the flue gas outlet;

[0010] An opening is provided at the bottom of the flue gas cooling tower, and a coolant circulation device is connected to the flue gas cooling tower through the opening, and the coolant circulation device is used to circulate and recover the coolant used by the flue gas cooling tower;

[0011] The desulfurization tower is connected to a flue gas mixing chamber, which includes an axial flow fan. The axial flow fan is used to reduce the flue gas temperature and remove water vapor in the flue gas by drawing outside air.

[0012] By adopting the above technical scheme, the high-temperature flue gas entering the desulfurization tower can be cooled by the flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which not only allows the cooled flue gas to pass through the flue gas cooling tower again to be further cooled, but also allows the cooled flue gas to be mixed with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, and helps to convert water vapor in the high-temperature flue gas into small droplets for precipitation, thereby facilitating the recovery of water vapor.

[0013] Optionally, at least two first pipes are arranged on the connecting pipe, and the first openings of the first pipes on the flue gas cooling tower are located at different positions; at least two second pipes are arranged on the connecting pipe, and the second openings of the second pipes on the flue gas cooling tower are located at different positions.

[0014] By adopting the above technical solution, the first opening and the second opening are set at different positions, and the connecting pipe can absorb the cooling flue gas at different positions and release the cooling flue gas to different positions. This is not only beneficial to the mixing of the cooling flue gas and the high-temperature flue gas, but also beneficial to return the cooling flue gas that does not meet the temperature requirements at the flue gas outlet to the flue gas cooling tower for cooling.

[0015] In a second aspect, the present application provides a method for recovering water vapor in flue gas, which adopts the following technical solution:

[0016] A method for recovering water vapor in flue gas, comprising:

[0017] The high-temperature flue gas is transported to the flue gas cooling tower through the fan;

[0018] The temperature of high-temperature flue gas is reduced by a flue gas cooling tower to obtain cooled flue gas;

[0019] The cooled flue gas is transported to the desulfurization tower, and the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower through the connecting pipe;

[0020] The sulfur dioxide in the cooled flue gas is removed by a desulfurization tower, and the cooled flue gas is transported to a flue gas mixing chamber;

[0021] The flue gas temperature is lowered by drawing outside air through the axial flow fan in the flue gas mixing chamber.

[0022] By adopting the above technical scheme, the high-temperature flue gas entering the desulfurization tower can be cooled by the flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which not only allows the cooled flue gas to pass through the flue gas cooling tower again to be further cooled, but also allows the cooled flue gas to be mixed with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, and helps to convert water vapor in the high-temperature flue gas into small droplets for precipitation, thereby facilitating the recovery of water vapor.

[0023] Optionally, obtaining a first temperature distribution of the flue gas cooling tower at a flue gas inlet;

[0024] Determine a high temperature area greater than a first preset temperature threshold according to the first temperature distribution;

[0025] According to the relative position between the high temperature area and the first opening of the first pipeline, the first pipeline closest to the high temperature area is used as the target first pipeline, and the first opening is the opening of the first pipeline on the flue gas cooling tower;

[0026] Determine the target ray from the target first pipeline to the high temperature area;

[0027] The cooling flue gas is controlled to be discharged from the target first pipe along the target ray.

[0028] By adopting the above technical solution, the cooling flue gas can be discharged through the target first pipe to the high temperature area, and the high temperature flue gas in the high temperature area can be dispersed by the cooling flue gas, so as to promote the mixing of the cooling flue gas and the high temperature flue gas and reduce the flue gas temperature at the flue gas inlet. Moreover, only a small amount of the first pipe needs to be mobilized to achieve the goal of discharging the cooling flue gas, which can effectively save resources.

[0029] Optionally, when there are at least two high temperature regions, the high temperature regions are combined in pairs to obtain a high temperature region combination;

[0030] For a target high temperature region combination in the high temperature region combination, connecting lines according to the high temperature regions included in the target high temperature region combination to obtain candidate connecting lines;

[0031] Determine whether the candidate link passes through the first opening;

[0032] If yes, the first opening passed through is recorded as a candidate first opening, and a candidate distance from the candidate first opening to the high temperature area included in the target high temperature area combination is calculated;

[0033] Determine whether the candidate distance is less than the exhaust limit distance;

[0034] If so, the cooling flue gas is controlled to be discharged from the first pipe corresponding to the candidate first opening along the candidate connecting line.

[0035] By adopting the above technical solution, the cooling flue gas can pass through multiple high-temperature areas, breaking up the high-temperature flue gas in multiple high-temperature areas at one time, promoting the mixing of the cooling flue gas and the high-temperature flue gas, and reducing the flue gas temperature at the flue gas inlet.

[0036] Optionally, when the candidate first opening corresponds to at least two groups of target high temperature region combinations, determining candidate connection lines corresponding to the at least two groups of target high temperature region combinations;

[0037] Planning the exhaust direction change relationship of the candidate first opening according to the candidate connection line;

[0038] Obtaining the influence surface of the candidate first opening according to the exhaust direction change relationship and the exhaust limit distance;

[0039] Determine whether there is a candidate high temperature area, so that the distance between the candidate high temperature area and the influence surface is less than a preset distance;

[0040] If so, the exhaust direction change relationship is adjusted according to the candidate high temperature area.

[0041] By adopting the above technical solution, when the cooling flue gas discharged from the first pipe sweeps through multiple high-temperature areas, if the influence surface of the first pipe is close to other high-temperature areas, the cooling flue gas discharged from the first pipe will pass through the aforementioned high-temperature areas, thereby reducing the temperature of the aforementioned high-temperature areas.

[0042] Optionally, determining whether the target ray intersects with the bottom slope of the flue gas cooling tower;

[0043] If yes, then according to the inclination angle of the bottom slope, the target ray is decomposed into a vertical component perpendicular to the bottom slope and a horizontal component horizontal to the bottom slope;

[0044] Determine whether the horizontal component has a vertically upward component;

[0045] If so, the first pipeline corresponding to the target first pipeline is updated to be the target first pipeline.

[0046] By adopting the above technical solution, the target first pipeline put into use is adjusted to avoid the cooling flue gas discharged from the target first pipeline affecting the coolant recovery at the bottom of the flue gas cooling tower, which is beneficial to the circulation recovery of the coolant.

[0047] Optionally, obtaining a second temperature distribution of the flue gas cooling tower at the flue gas outlet;

[0048] Determine an abnormal temperature region greater than a second preset temperature threshold according to the second temperature distribution;

[0049] According to the relative position between the temperature abnormal area and the second opening of the second pipeline, the second pipeline closest to the high temperature area is used as the target second pipeline, and the second opening is the opening of the second pipeline on the flue gas cooling tower;

[0050] Determine the suction line from the target second pipeline to the temperature abnormality area;

[0051] The controlled cooling flue gas is sucked into the target second pipe along the suction line.

[0052] By adopting the above technical solution, the cooled flue gas with a higher temperature can be sucked in through the second pipe, so that the cooled flue gas can be cooled again in the flue gas cooling tower, which helps to convert the water vapor in the cooled flue gas into small droplets for precipitation, making it easier to recover the water vapor.

[0053] Optionally, when there are at least two abnormal temperature regions, determine the position of the target second pipeline corresponding to each abnormal temperature region;

[0054] Determine whether the position distance between two adjacent target second pipelines is greater than a preset position distance;

[0055] If not, the two target second pipelines are controlled to inhale; according to the positions of the two target second pipelines, an exhaust second pipeline is selected from the remaining second pipelines; and the exhaust second pipeline is controlled to exhaust;

[0056] If so, one of the target second pipelines is controlled to inhale, and the other target second pipeline is controlled to exhaust.

[0057] By adopting the above technical solution, different second pipes are controlled to perform air intake and exhaust respectively, so that the flue gas at the flue gas outlet flows on a horizontal plane, which helps to stabilize the flue gas temperature entering the desulfurization tower at a constant value, making it easier for the equipment after the flue gas cooling tower to perform related operations.

[0058] Optionally, a first exhaust rate of the first pipeline is obtained, and an intake rate and a second exhaust rate of the second pipeline are obtained;

[0059] Calculate the sum of the first exhaust rate and the second exhaust rate to obtain a total exhaust rate;

[0060] Determine whether the total exhaust rate is greater than the intake rate;

[0061] If yes, the suction rate is adjusted according to the difference between the total exhaust rate and the suction rate;

[0062] If not, the second exhaust rate is adjusted according to the difference between the total exhaust rate and the suction rate.

[0063] By adopting the above technical solution, the intake rate or the second exhaust rate can be adjusted according to the total exhaust rate and the intake rate, so that the intake and exhaust of the connecting pipe are balanced.

[0064] In a third aspect, the present application provides a smart terminal, which adopts the following technical solution:

[0065] An intelligent terminal comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and execute any of the above-mentioned methods for recovering water vapor in flue gas.

[0066] By adopting the above technical scheme, the high-temperature flue gas entering the desulfurization tower can be cooled by the flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which not only allows the cooled flue gas to pass through the flue gas cooling tower again to be further cooled, but also allows the cooled flue gas to be mixed with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, and helps to convert water vapor in the high-temperature flue gas into small droplets for precipitation, thereby facilitating the recovery of water vapor.

[0067] In a fourth aspect, the present application provides a computer storage medium capable of storing a corresponding program, which has the characteristic of facilitating the improvement of the recovery rate of water vapor in flue gas, and adopts the following technical solution:

[0068] A computer-readable storage medium stores a computer program that can be loaded by a processor and execute any of the above-mentioned methods for recovering water vapor in flue gas.

[0069] By adopting the above technical scheme, the high-temperature flue gas entering the desulfurization tower can be cooled by the flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which not only allows the cooled flue gas to pass through the flue gas cooling tower again to be further cooled, but also allows the cooled flue gas to be mixed with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, and helps to convert water vapor in the high-temperature flue gas into small droplets for precipitation, thereby facilitating the recovery of water vapor.

[0070] In summary, the present application includes at least one of the following beneficial technical effects:

[0071] The high-temperature flue gas entering the desulfurization tower can be cooled by the flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which not only allows the cooled flue gas to pass through the flue gas cooling tower again to be further cooled, but also allows the cooled flue gas to be mixed with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, which helps to convert the water vapor in the high-temperature flue gas into small droplets for precipitation, and facilitates the recovery of the water vapor;

[0072] The cooling flue gas can be discharged toward the high-temperature area through the target first pipe, and the high-temperature flue gas in the high-temperature area can be dispersed by the cooling flue gas, so as to promote the mixing of the cooling flue gas and the high-temperature flue gas and reduce the flue gas temperature at the flue gas inlet;

[0073] The cooled flue gas with a higher temperature can be inhaled through the second pipe, so that the cooled flue gas can be cooled again in the flue gas cooling tower, which helps to convert the water vapor in the cooled flue gas into small droplets for precipitation, making it easier to recover the water vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a structural schematic diagram of a water vapor recovery system in flue gas provided in an embodiment of the present application.

[0075] Figure 2 It is a structural schematic diagram of a connecting pipeline provided in an embodiment of the present application.

[0076] Figure 3 It is a schematic flow chart of a method for recovering water vapor in flue gas provided in an embodiment of the present application.

[0077] Figure 4 It is a flow chart of a method for discharging cooling flue gas provided in an embodiment of the present application.

[0078] Figure 5 It is a flow chart of a method for discharging cooling flue gas provided in an embodiment of the present application.

[0079] Figure 6 It is a flow chart of a method for discharging cooling flue gas provided in an embodiment of the present application.

[0080] Figure 7 It is a schematic diagram of a method for discharging cooling flue gas provided in an embodiment of the present application.

[0081] Figure 8 It is a flow chart of a method for discharging cooling flue gas provided in an embodiment of the present application.

[0082] Fig. 9 It is a schematic diagram of a method for discharging cooling flue gas provided in an embodiment of the present application.

[0083] Fig.10 It is a flow chart of a method for cooling flue gas inhalation provided in an embodiment of the present application.

[0084] Fig.11 It is a flow chart of a method for cooling flue gas inhalation provided in an embodiment of the present application.

[0085] Fig.12 It is a flow chart of a method for cooling flue gas inhalation provided in an embodiment of the present application.

[0086] Explanation of the reference numerals: flue gas cooling tower 1; fan 2; desulfurization tower 3; flue gas mixing chamber 4; coolant circulation device 5; connecting pipe 11; first pipe 111; gas storage container 112; second pipe 113; spray structure 12; spray structure 13; concrete 14; opening 15; demister 16; axial flow fan 41; water baffle guide plate 42; coolant pool 51; cooling acidic water pool 52; cooling tower 53; alkali adjustment pool 54; stirring reaction pool 55; filter press 56. DETAILED DESCRIPTION

[0087] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figures 1 to 12 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0088] The present application embodiment discloses a system for recovering water vapor in flue gas. Figure 1 The system includes a fan 2, a flue gas cooling tower 1, a desulfurization tower 3, a flue gas mixing chamber 4 and a coolant circulation device 5;

[0089] The fan 2 is connected to the flue gas cooling tower 1. The fan 2 is used to transport the high-temperature flue gas to the flue gas cooling tower 1. The flue gas cooling tower 1 is used to reduce the temperature of the high-temperature flue gas to obtain cooled flue gas.

[0090] The flue gas cooling tower 1 is connected to the desulfurization tower 3, and the desulfurization tower 3 is used to remove sulfur dioxide in the cooling flue gas. A connecting pipe 11 is provided between the flue gas inlet and the flue gas outlet of the flue gas cooling tower 1. The connecting pipe 11 includes a first pipe 111 near the flue gas inlet, a gas storage container 112, and a second pipe 113 near the flue gas outlet.

[0091] An opening is provided at the bottom of the flue gas cooling tower 1, and a coolant circulation device 5 is connected to the flue gas cooling tower 1 through the opening. The coolant circulation device 5 is used to circulate and recover the coolant used by the flue gas cooling tower;

[0092] The desulfurization tower 3 is connected to a flue gas mixing chamber 4. The flue gas mixing chamber 4 includes an axial flow fan 41. The axial flow fan 41 is used to reduce the flue gas temperature and remove water vapor in the flue gas by extracting external air.

[0093] The flue gas cooling tower 1 is a device for cooling flue gas. After the coolant contacts the flue gas flow, heat exchange is carried out to make the flue gas produce water vapor. The water vapor evaporates and takes away the heat to achieve the purpose of evaporative heat dissipation. For example, the 130°C flue gas is reduced to 70°C through the spray layer in the tower. The spray adopts countercurrent spraying, that is, the flue gas moves from bottom to top, and the spray water flows from top to bottom. The heat of the flue gas is directly exchanged and transferred to the spray water, so as to achieve the purpose of cooling. A demister 16 is also provided at the top of the flue gas cooling tower 1, and the droplets in the cooled flue gas can be removed by the demister 16. Furthermore, the demister 16 will transport the separated droplets to the coolant circulation device 5.

[0094] A spray structure 12 and a spray structure 13 are arranged in the flue gas cooling tower 1, and the two spray structures supply cooling liquid through the cooling liquid pool 51; a tower plate structure is also arranged between the two spray structures, and the tower plate structure is used to separate the liquid and gas mixture, wherein on the tower plate structure, the gas rises through the holes, and the liquid flows on the plate surface; the inner wall of the bottom of the flue gas cooling tower 1 is covered with concrete 14; the bottom of the flue gas cooling tower 1 is inclined, and an opening 15 is arranged at a low horizontal position of the bottom of the flue gas cooling tower 1, and the opening 15 is connected to the cooling liquid circulation device 5.

[0095] The flue gas cooling tower 1 is provided with a connecting pipe 11, which can return the cooled flue gas at the flue gas outlet to the flue gas inlet, so that the cooled flue gas passes through the flue gas cooling tower 1 again, and the cooled flue gas is cooled for a second time. Figure 2 At least two first pipes 111 are provided on the connecting pipe 11, and the first openings of the first pipes 111 on the flue gas cooling tower 1 are located at different positions; at least two second pipes 113 are provided on the connecting pipe 11, and the second openings of the second pipes 113 on the flue gas cooling tower 1 are located at different positions. Optionally, a pipeline air pump is provided on the first pipeline 111 and the second pipeline 113, and the pipeline air pump is used to control the pipeline to inhale or discharge the cooling flue gas. For example, the pipeline air pump controls the second pipeline to inhale the cooling flue gas or discharge the cooling flue gas.

[0096] Furthermore, temperature sensors are provided at both the flue gas inlet and the flue gas outlet of the flue gas cooling tower 1, and the temperature sensors can be provided at a plurality of different positions. The temperature sensors are used to measure the flue gas temperature.

[0097] The fan 2 is used to introduce high-temperature flue gas into the flue gas cooling tower 1. For example, the temperature of the high-temperature flue gas is greater than 130°C.

[0098] The desulfurization tower 3 is used to remove sulfur dioxide from the flue gas through an alkaline solution to reduce the sulfur dioxide emission concentration. Exemplarily, the desulfurization tower 3 is provided with six layers of spraying and two layers of efficiency-enhancing trays. The desulfurized flue gas passes through a high-efficiency demister to remove small droplets and smoke dust and then enters the mixing chamber through an exhaust pipe. Optionally, the alkaline solution used in the desulfurization tower 2 is limestone slurry.

[0099] The flue gas mixing chamber 4 is used to reduce the flue gas temperature and remove water vapor in the flue gas. After the flue gas enters the flue gas mixing chamber 4, the flue gas flow rate is reduced. At the same time, there are three axial flow fans 41 that intake air tangentially. The outdoor fresh air enters tangentially through the axial flow fans 41 under pressure, breaks up and mixes the flue gas, and at the same time pushes the internal gas to rotate along the tangent of the flue gas mixing chamber 4, gradually reducing the flue gas temperature. Furthermore, a perforated multi-layer water baffle guide plate 42 is provided in the middle of the tower, and the mixed flue gas after cooling and dehydration is dispersed and discharged into the air through the top-layer outlet. Exemplarily, the three axial flow fans 41 in the flue gas mixing chamber 4 intake air tangentially, and the air volume is 78000-80000m 3 / h, a water baffle 42 is provided at the smoke pipe opening of the smoke mixing chamber 4, and the water-containing smoke passes through the water baffle 42 to collide and remove water, thereby achieving the function of recovering water vapor. Exemplarily, the axial flow fan 41 can be set on different horizontal planes to promote the rotation of smoke on different horizontal planes, and at the same time, the smoke can be spirally ascended as a whole, so that the water baffle 42 distributed on the side wall of the smoke mixing chamber 4 can block as much smoke as possible. Furthermore, the water baffle 42 will transport the collected water to the coolant circulation device 5.

[0100] The cooling liquid circulation device 5 includes a cooling liquid tank 51 , a cooling acidic water tank 52 , a cooling tower 53 , an alkali adjustment tank 54 , a stirring reaction tank 55 and a filter press 56 .

[0101] The cooling liquid pool 51 is used to store the cooling liquid and provide the cooling liquid to the flue gas cooling tower 1. In the present application, the cooling liquid may be water.

[0102] The cooling acidic water pool 52 is used to store the coolant recovered by the flue gas cooling tower 1. The cooling acidic water pool 52 is also connected to the alkali adjustment pool 54, the alkali adjustment pool 54 is connected to the stirring reaction pool 55, the stirring reaction pool 55 is connected to the filter press 56 through a water pump, and the filter press 56 is connected to the cooling liquid pool 51 through a water pipe. Exemplarily, the coolant recovered by the flue gas cooling tower 1 enters the cooling tower 53 through the opening 15, and the cooling tower 53 cools the coolant.

[0103] The alkali adjustment tank 54 is used to adjust the pH value of the coolant. Figure 1 The arrows shown indicate the addition of alkaline agents to adjust the pH value of the spray water.

[0104] The stirring reaction tank 55 is used to increase the acid-base reaction rate. Exemplarily, the stirring reaction tank 55 stirs the solvent or reagent in the tank evenly through a vertical stirrer to increase the acid-base reaction rate.

[0105] The filter press 56 is used to separate the liquid and solid in the coolant. The filter press 56 presses the solid impurities in the coolant into filter cakes for transportation, and then returns the filtered coolant to the coolant pool 51.

[0106] To summarize, the system can cool the high-temperature flue gas entering the desulfurization tower through a flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which can not only make the cooled flue gas pass through the flue gas cooling tower again to be further cooled, but also make the cooled flue gas mix with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, and helps to liquefy the water vapor in the high-temperature flue gas into small droplets, which is convenient for recovering water.

[0107] The present application discloses a method for recovering water vapor in flue gas. Figure 1 The water vapor recovery system in the flue gas is shown. Figure 3 , the method comprising:

[0108] Step S31: conveying the high-temperature flue gas to the flue gas cooling tower through a fan.

[0109] In the present application, high temperature flue gas refers to flue gas with a temperature higher than 130°C.

[0110] Optionally, the high temperature flue gas is generated by a thermal power plant, a metal smelter, a cement plant or a petrochemical plant.

[0111] Step S32: reducing the temperature of the high-temperature flue gas through a flue gas cooling tower to obtain cooled flue gas.

[0112] Optionally, a spray layer is provided in the flue gas cooling tower, through which the 130°C flue gas is reduced to 70°C. The spray adopts countercurrent spraying, that is, the flue gas moves from bottom to top, and the spray water flows from top to bottom, and the heat of the flue gas is directly exchanged and transferred to the spray water, so as to achieve the purpose of cooling. Among them, after the coolant contacts the flue gas flow, through heat exchange, the flue gas generates water vapor, and the water vapor evaporates and takes away the heat to achieve the purpose of evaporation and heat dissipation. On the other hand, it is beneficial for the water vapor in the high-temperature flue gas to liquefy into small droplets, which is convenient for recovering the moisture in the high-temperature flue gas.

[0113] Step S33: conveying the cooled flue gas to the desulfurization tower, and returning the cooled flue gas to the flue gas inlet of the flue gas cooling tower through the connecting pipe.

[0114] The desulfurization tower desulfurizes the cooled flue gas at a temperature lower than the desulfurization temperature, for example, the desulfurization temperature is 70°C.

[0115] Optionally, the temperature of the cooled flue gas is obtained by a temperature sensor; when it is detected that the temperature of the cooled flue gas is greater than the desulfurization temperature, the connecting pipe is controlled to inhale the cooled flue gas and return the cooled flue gas to the flue gas inlet of the flue gas cooling tower.

[0116] Step S34: removing sulfur dioxide from the cooled flue gas through a desulfurization tower, and conveying the cooled flue gas to a flue gas mixing chamber.

[0117] The desulfurization tower is used to remove sulfur dioxide from flue gas through an alkaline solution to reduce the concentration of sulfur dioxide emissions. Optionally, the alkaline solution used in the desulfurization tower is limestone slurry.

[0118] Exemplarily, the desulfurization tower is provided with six layers of spraying and two layers of efficiency-enhancing trays. The flue gas after desulfurization passes through a high-efficiency demister to remove small droplets and smoke dust and then enters the flue gas mixing chamber through an exhaust pipe.

[0119] Step S35: The axial flow fan in the smoke mixing chamber draws outside air to reduce the smoke temperature.

[0120] The flue gas mixing chamber is used to reduce the flue gas temperature and remove water vapor from the flue gas.

[0121] Optionally, after the flue gas enters the flue gas mixing chamber, the flue gas flow rate is reduced. At the same time, there are three axial flow fans for tangential air intake. Outdoor fresh air enters tangentially through the axial flow fans under pressure, breaks up and mixes the flue gas, and at the same time pushes the gas to rotate along the tangent, gradually reducing the flue gas temperature.

[0122] Furthermore, a perforated multi-layer water-retaining guide plate is provided in the middle of the tower, and the mixed flue gas after cooling and dehydration is dispersed and discharged into the air through the top-layer outlet.

[0123] For example, three axial flow fans in the flue gas mixing chamber provide tangential air flow, with an air volume of 78000-80000m 3 / h, a water retaining guide plate is provided at the smoke pipe opening of the smoke mixing chamber, and the water-containing smoke passes through the water retaining guide plate to remove water.

[0124] For example, please refer to Figure 1 , the angle between the water retaining guide plate and the side wall of the smoke mixing chamber is θ, θ is less than 90 degrees, and the value of θ is positively correlated with the power of the axial flow fan, that is, the greater the power of the axial flow fan, the greater θ. Optionally, the angle θ is adjusted according to the smoke flow rate in the smoke mixing chamber, wherein the angle θ is positively correlated with the smoke flow rate.

[0125] In summary, the present method can cool the high-temperature flue gas entering the desulfurization tower through a flue gas cooling tower, and a connecting pipe is also provided on the flue gas cooling tower, through which the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower, which can not only make the cooled flue gas pass through the flue gas cooling tower again to be further cooled, but also make the cooled flue gas mix with the high-temperature flue gas to reduce the temperature of the high-temperature flue gas, which is beneficial to cooling the high-temperature flue gas, so that the flue gas entering the desulfurization tower is controlled at a lower temperature, and helps to convert the water vapor in the high-temperature flue gas into small droplets for precipitation, so as to facilitate the recovery of the water vapor.

[0126] In the following embodiment, when the cooled flue gas is returned to the flue gas inlet, the cooled flue gas can be used to cool the high-temperature flue gas at the flue gas inlet, and the cooled flue gas and the high-temperature flue gas are fully mixed, so that the flue gas temperature at the flue gas inlet can be reduced, and the flue gas temperature distribution at the bottom of the flue gas cooling tower can be more even. The embodiment of the present application discloses a method for discharging cooled flue gas, the method comprising: Figure 1 The water vapor recovery system in the flue gas is shown. Figure 4 , the method comprising:

[0127] Step S401: obtaining a first temperature distribution of a flue gas cooling tower at a flue gas inlet.

[0128] The first temperature distribution refers to the temperature distribution near the flue gas inlet of the flue gas cooling tower. Please refer to Figure 1 Since the flue gas inlet is arranged at the bottom of the flue gas cooling tower 1, in this embodiment, the first temperature distribution may also refer to the temperature distribution at the bottom of the flue gas cooling tower.

[0129] A plurality of temperature sensors are arranged at the smoke inlet of the smoke cooling tower, and the smoke temperature at the smoke inlet can be determined by the temperature sensors. Furthermore, since the smoke temperature in the smoke cooling tower changes continuously, for the unmeasured space between the two temperature sensors, although the temperature sensor cannot detect it, the temperature change in the unmeasured space can be estimated. If the distance between the unmeasured space and the smoke inlet is greater than the preset temperature interference distance, the temperature change in the unmeasured space can be regarded as a linear change; if the distance between the unmeasured space and the smoke inlet is greater than the preset temperature interference distance, the temperature change in the unmeasured space can be regarded as a nonlinear change, and the nonlinear change conforms to a quadratic function, and the point in the unmeasured space closest to the smoke inlet corresponds to the vertex of the quadratic function.

[0130] Step S402: determining a high temperature region having a temperature greater than a first preset temperature threshold according to the first temperature distribution.

[0131] The first preset temperature threshold is a preset constant, and the first preset temperature threshold is related to the temperature of the high-temperature flue gas. For example, if the temperature of the high-temperature flue gas is 140°C, the first preset temperature threshold can be set to 120°C.

[0132] The temperature of any point in the high temperature area is greater than the first preset temperature threshold. The high temperature area can be of any shape.

[0133] Step S403: according to the relative position between the high temperature area and the first opening of the first pipeline, the first pipeline closest to the high temperature area is taken as the target first pipeline, and the first opening is the opening of the first pipeline on the flue gas cooling tower.

[0134] Exemplarily, the point coordinates corresponding to the maximum temperature in the high temperature area are obtained; the distances from the point coordinates to each first opening are calculated; the first pipeline corresponding to the shortest distance is taken as the target first pipeline. If there are multiple point coordinates in the high temperature area, the outlier point coordinates are removed from the point coordinates; the mean of the remaining point coordinates is calculated, and the mean is used as the point coordinates for subsequent calculations.

[0135] Exemplarily, according to the shape of the high-temperature area, the centroid of the high-temperature area is determined; the distance from the centroid to each first opening is calculated; and the first pipeline corresponding to the shortest distance is taken as the target first pipeline.

[0136] In another aspect of this embodiment, the first pipeline that is less than the exhaust limit distance can be used as the target first pipeline according to the distance between the high temperature area and the first opening of the first pipeline. If there are multiple first pipelines that meet the above requirements, one of the first pipelines is randomly selected as the target first pipeline, or the first pipeline closest to the high temperature area is selected as the target first pipeline.

[0137] Step S404: Determine the target ray from the target first pipeline to the high temperature area.

[0138] The target ray is a ray starting from the target first pipe and in the direction from the target first pipe to the high temperature area. Since cooling flue gas is required to disperse the flue gas in the high temperature area in the embodiment, the exhaust direction of the cooling flue gas is determined by the target ray in this step.

[0139] Furthermore, when determining the target ray, the point coordinates or the centroid corresponding to the maximum temperature in step S403 may be used to replace the high temperature area.

[0140] Step S405: Control the cooling flue gas to be discharged from the target first pipe along the target ray.

[0141] An air pump and an exhaust fan are arranged in the first pipeline. The air pump can adjust the flow rate of the cooling flue gas, and the exhaust fan can adjust the discharge direction of the cooling flue gas.

[0142] Optionally, the target first pipeline discharges the cooling flue gas at a preset flow rate, and the preset flow rate depends on the maximum power of the air pump.

[0143] In summary, the cooling flue gas can be discharged toward the high-temperature area through the target first pipe, and the high-temperature flue gas in the high-temperature area can be dispersed by the cooling flue gas, promoting the mixing of the cooling flue gas and the high-temperature flue gas, and reducing the flue gas temperature at the flue gas inlet. Moreover, only a small amount of the first pipe needs to be mobilized to achieve the goal of discharging the cooling flue gas, which can effectively save resources.

[0144] In the following embodiments, when there are multiple high-temperature areas, the present application can select a suitable first pipe so that the cooling flue gas discharged from the first pipe can just pass through at least two high-temperature areas to improve efficiency. Therefore, the present application embodiment discloses a method for discharging cooling flue gas, which comprises Figure 1 The water vapor recovery system in the flue gas is shown. Figure 5 , the method comprising:

[0145] Step S501: when there are at least two high temperature regions, the high temperature regions are combined in pairs to obtain a high temperature region combination.

[0146] Exemplarily, assuming that the high temperature regions include A, B, C and D, the high temperature regions are combined in pairs to obtain the high temperature region combination of {(A, B), (A, C), (A, D), (B, C), (B, D), (C, D)}.

[0147] Step S502: For a target high temperature region combination in the high temperature region combination, lines are connected according to the high temperature regions included in the target high temperature region combination to obtain candidate lines.

[0148] Exemplarily, assuming that the high temperature area combination is {(A, B), (A, C), (A, D), (B, C), (B, D), (C, D)}, the high temperature areas in each high temperature area combination are combined, and the obtained candidate lines include {straight line AB, straight line AC, straight line AD, straight line BC, straight line BD, straight line CD}.

[0149] Furthermore, if there are at least two candidate links that are located exactly on the same straight line, the at least two candidate links are merged into one candidate link.

[0150] Step S503: Determine whether the candidate link passes through the first opening.

[0151] The two ends of the candidate connection line are extended to determine whether the candidate connection line passes through the first opening. If so, it means that the cooling flue gas discharged from the first opening may pass through the high-temperature area included in the target high-temperature area combination at one time.

[0152] Step S504: If yes, the first opening passed through is recorded as a candidate first opening, and a candidate distance from the candidate first opening to the high temperature region included in the target high temperature region combination is calculated.

[0153] On the other hand, if the candidate link does not pass through the first opening, the process of this embodiment ends and the Figure 4 In the process of the illustrated embodiment, the target first opening corresponding to each high-temperature area is selected to discharge the cooling flue gas.

[0154] Step S505: Determine whether the candidate distance is less than the exhaust limit distance.

[0155] The exhaust limit distance refers to the farthest distance that the cooling flue gas discharged from the first pipe can reach. Optionally, the exhaust limit distance is related to the maximum power of the air pump. Optionally, since there are other first pipes inside the flue gas cooling tower that will discharge cooling flue gas, and the flue gas inlet will also transport high-temperature flue gas, it will affect the farthest exhaust distance of the cooling flue gas discharged from the candidate first opening. For example, if the exhaust limit distance is A when the air pump works at maximum power, but the exhaust limit distance in the flue gas cooling tower is An, where n is an empirical value.

[0156] Step S506: If yes, control the cooling flue gas to be discharged from the first pipe corresponding to the candidate first opening along the candidate connecting line.

[0157] On the other hand, if it is determined that the candidate distance is greater than the exhaust limit distance, the process of this embodiment is terminated and the exhaust limit is calculated. Figure 4 In the process of the illustrated embodiment, the target first opening corresponding to each high-temperature area is selected to discharge the cooling flue gas.

[0158] Optionally, the first pipe corresponding to the candidate first opening discharges the cooling flue gas at a preset flow rate, and the preset flow rate depends on the maximum power of the air pump.

[0159] In summary, the cooling flue gas can be allowed to pass through multiple high-temperature areas, breaking up the high-temperature flue gas in multiple high-temperature areas at one time, promoting the mixing of the cooling flue gas and the high-temperature flue gas, and reducing the flue gas temperature at the flue gas inlet.

[0160] In the following embodiment, when the candidate first opening corresponds to multiple groups of high temperature area combinations, the direction of the cooling flue gas discharged from the candidate first opening needs to change over time so that the cooling flue gas can sweep through the aforementioned multiple groups of high temperature area combinations. Therefore, the embodiment of the present application discloses a method for discharging cooling flue gas, which comprises Figure 1 The water vapor recovery system in the flue gas is shown. Figure 6 , the method comprising:

[0161] Step S601: when the candidate first openings correspond to at least two target high temperature region combinations, determine candidate links corresponding to the at least two target high temperature region combinations.

[0162] Please refer to the process of determining candidate connections Figure 5 The embodiments shown will not be described in detail here.

[0163] Step S602: planning the exhaust direction change relationship of the candidate first opening according to the candidate link.

[0164] The exhaust direction change relationship refers to the mapping relationship between the direction of the cooling gas exhausted from the candidate first opening and the time change.

[0165] Optionally, the candidate lines are arranged to obtain a candidate line combination; according to the order of the candidate lines in the candidate line combination, the candidate exhaust direction change relationship is obtained; the total rotation angle corresponding to each candidate direction change relationship is calculated; and the candidate exhaust direction change relationship corresponding to the smallest total rotation angle is taken as the exhaust direction change relationship used in this step. The total rotation angle refers to the sum of the angles required to rotate the exhaust direction after the exhaust direction is traversed according to the order of the candidate lines in the candidate line combination.

[0166] For example, please refer to Figure 7 , point O represents the candidate first opening. If the candidate lines include candidate line OA, candidate line OB and candidate line OC, the candidate lines are arranged, and the obtained candidate line combination is {ABC, ACB, BAC, BCA, CBA, CAB}. Taking ABC as an example, the exhaust direction needs to pass through OA, OB and OC in sequence, so the total rotation angle is α+β.

[0167] Step S603: acquiring the influence surface of the candidate first opening according to the exhaust direction change relationship and the exhaust limit distance.

[0168] Optionally, a line segment is formed with the candidate first opening as an endpoint and the exhaust limit distance as a length; the line segment is rotated according to the exhaust direction change relationship to obtain an influence surface.

[0169] The influence surface refers to the area through which the exhaust gas passes when the exhaust direction of the candidate first opening rotates along the exhaust direction change relationship. For example, please refer to Figure 7 Taking ABC as an example, the affected surfaces corresponding to the exhaust direction change relationship include surface OAB and surface OBC.

[0170] Step S604: Determine whether there is a candidate high temperature area, so that the distance from the candidate high temperature area to the influence surface is less than a preset distance.

[0171] The preset distance is a constant, and the specific value of the preset distance can be adjusted according to actual needs.

[0172] If the distance from the candidate high temperature area to the influence surface is less than the preset distance, it means that the distance between the candidate high temperature area and the influence surface is close enough. In the process of exhausting along the exhaust direction change relationship of the candidate first opening, the cooling flue gas can temporarily pass through the candidate high temperature area to reduce the temperature of the candidate high temperature area and improve the cooling efficiency.

[0173] Step S605: If yes, adjust the exhaust direction change relationship according to the candidate high temperature area.

[0174] On the other hand, if there is no candidate high temperature region, there is no need to adjust the exhaust direction change relationship.

[0175] Exemplarily, when approaching the candidate high temperature region, the exhaust direction change relationship is made to pass through the candidate high temperature region. For example, when the candidate first opening is rotated along the exhaust direction change relationship, if the cooling flue gas discharged from the candidate first opening is close to the candidate high temperature region, the candidate first opening is controlled to rotate so that the discharged cooling flue gas is close to the candidate high temperature region.

[0176] Exemplarily, if the influence surface corresponding to the candidate high temperature region is composed of candidate line OA and candidate line OB, where O represents the candidate first opening and the candidate high temperature region is recorded as T, the exhaust direction change relationship changes from OA-OB to OA-OT-OB.

[0177] In summary, when the cooling flue gas discharged from the first pipe sweeps through multiple high-temperature areas, if the influence surface of the first pipe is closer to other high-temperature areas, the cooling flue gas discharged from the first pipe will pass through the aforementioned high-temperature areas to reduce the temperature of the aforementioned high-temperature areas.

[0178] In the following embodiment, since the bottom of the flue gas cooling tower is an inclined surface, when the first pipeline discharges the cooling flue gas, the discharge direction of the cooling flue gas may affect the recovery of the coolant on the inclined surface. Therefore, the embodiment of the present application discloses a method for discharging cooling flue gas, which comprises Figure 1 The water vapor recovery system in the flue gas is shown. Figure 8 , the method comprising:

[0179] Step S801: determine whether the target ray intersects with the bottom slope of the flue gas cooling tower.

[0180] After the cooling gas is discharged along the target ray, depending on the direction of the target ray, it may affect the coolant at the bottom of the flue gas cooling tower to enter the coolant circulation device through the opening. Therefore, it is necessary to first determine whether the target ray intersects with the bottom slope of the flue gas cooling tower.

[0181] Step S802: If yes, decompose the target ray into a vertical component perpendicular to the bottom slope and a horizontal component horizontal to the bottom slope according to the inclination angle of the bottom slope.

[0182] If not, the process of this embodiment ends.

[0183] Furthermore, in another aspect of this step, since the flue gas is still limited by the exhaust limit distance, if the distance between the intersection of the target ray and the bottom slope and the first opening is greater than the exhaust limit distance, it means that the cooling flue gas discharged from the first opening cannot affect the coolant on the bottom slope, and there is no need to continue to execute subsequent steps; if the distance between the intersection of the target ray and the bottom slope and the first opening is greater than the exhaust limit distance, it means that the cooling flue gas discharged from the first opening will affect the coolant on the bottom slope, and it is necessary to continue to execute subsequent steps.

[0184] In some other embodiments, the cooling flue gas flow rate at the intersection is calculated according to the distance between the intersection of the target ray and the bottom slope and the first opening; according to the inclination angle of the bottom slope, the cooling flue gas flow rate is decomposed into a vertical component of the flow rate perpendicular to the bottom slope and a horizontal component of the flow rate horizontal to the bottom slope; if the horizontal component of the flow rate is greater than the preset flow threshold, it means that the cooling flue gas will affect the circulation and recovery of the coolant, and step S804 needs to be executed; if the horizontal component of the flow rate is less than the preset flow threshold, it means that the cooling flue gas will not affect the circulation and recovery of the coolant, and there is no need to continue to execute subsequent steps. Exemplarily, the formula for calculating the cooling flue gas flow rate at the intersection is, where is the cooling flue gas flow rate at the intersection, is the flue gas flow rate out of the first opening, e is a natural constant, a is an attenuation coefficient, x represents the distance between the intersection and the first opening, and b is a correction constant.

[0185] For example, please refer to Fig. 9 , the first pipe 901 is the target first pipe, and the target ray corresponding to the first pipe 901 is the ray OP, which is decomposed into a horizontal component OM and a vertical component ON.

[0186] Step S803: Determine whether the horizontal component has a vertically upward component.

[0187] If there is a vertically upward component in the horizontal component, it means that the cooling flue gas will hinder the flow of the coolant to the opening, and the target first pipeline to be used needs to be adjusted.

[0188] Vertically upward refers to the direction opposite to the direction of gravity.

[0189] Step S804: If yes, then update the first pipe corresponding to the target first pipe to be the target first pipe.

[0190] If not, the process of this embodiment ends.

[0191] Optionally, the remaining first pipelines are traversed, and it is determined whether the remaining first pipelines meet the requirements according to the above steps S801 to S804, and the first pipelines that meet the requirements are used as the target first pipelines.

[0192] Optionally, if the flue gas cooling tower is cylindrical, the first pipeline to be tested opposite to the target first pipeline is preferentially selected; according to the above steps S801 to S804, it is determined whether the first pipeline to be tested meets the requirements, and the first pipeline that meets the requirements is used as the target first pipeline. For example, please refer to Fig. 9 , select the first pipeline 902 opposite to the first pipeline 901 as the first pipeline to be tested, and determine that the first pipeline 902 meets the requirements of this embodiment, then use the first pipeline 902 as the target first pipeline.

[0193] In summary, adjusting the target first pipeline put into use can prevent the cooling flue gas discharged from the target first pipeline from affecting the coolant recovery at the bottom of the flue gas cooling tower, which is beneficial to the circulation recovery of the coolant.

[0194] Therefore, the embodiment of the present application discloses a method for cooling smoke inhalation, which comprises Figure 1 The water vapor recovery system in the flue gas is shown. Fig.10 , the method comprising:

[0195] Step S1001: obtaining a second temperature distribution of a flue gas cooling tower at a flue gas outlet.

[0196] The second temperature distribution refers to the temperature distribution near the flue gas outlet of the flue gas cooling tower. Please refer to Figure 1 The second temperature distribution may also refer to the temperature distribution between the top spray layer and the demister 16 .

[0197] A plurality of temperature sensors are arranged at the flue gas outlet of the flue gas cooling tower, and the flue gas temperature at the flue gas outlet can be determined by the temperature sensors.

[0198] Step S1002: determining an abnormal temperature region having a temperature greater than a second preset temperature threshold according to the second temperature distribution.

[0199] The second preset temperature threshold is a preset constant, and the second preset temperature threshold is related to the desulfurization requirement of the desulfurization tower. For example, if the desulfurization requirement of the desulfurization tower is to cool the flue gas to at least 70°C, the second preset temperature threshold can be set to 70°C.

[0200] Step S1003: according to the relative position between the temperature abnormality area and the second opening of the second pipe, the second pipe closest to the high temperature area is used as the target second pipe, and the second opening is the opening of the second pipe on the flue gas cooling tower.

[0201] The temperature of any point in the temperature abnormal area is greater than the second preset temperature threshold. The temperature abnormal area can be of any shape.

[0202] Step S1004: Determine the air intake line from the target second pipeline to the temperature abnormality area.

[0203] The inhalation ray is a ray starting from the temperature abnormal area and heading from the temperature abnormal area to the target second pipe. Since the second pipe needs to be used to absorb the smoke in the temperature abnormal area in the embodiment, the absorption direction of the cooling smoke is determined by the inhalation ray in this step.

[0204] Furthermore, when determining the target ray, the point coordinates or the centroid corresponding to the maximum temperature in the temperature anomaly region may be used to replace the temperature anomaly region.

[0205] Step S1005: Control the cooling flue gas to be sucked into the target second pipe along the suction line.

[0206] An air pump and an exhaust fan are arranged in the second pipeline. The air pump can adjust the flow rate of the cooling flue gas, and the exhaust fan can adjust the absorption direction of the cooling flue gas.

[0207] Optionally, the target second pipeline discharges the cooling flue gas at a preset flow rate, and the preset flow rate depends on the maximum power of the air pump.

[0208] In summary, the cooled flue gas with a higher temperature can be inhaled through the second pipe, so that the cooled flue gas can be cooled again in the flue gas cooling tower, which helps to convert the water vapor in the cooled flue gas into small droplets for precipitation, making it easier to recover the water vapor.

[0209] In the following embodiments, if there are multiple abnormal temperature areas, the embodiment of the present application can also use different methods to control the second pipe to make the smoke at the smoke outlet flow and promote smoke circulation. Therefore, the embodiment of the present application discloses a method for cooling smoke inhalation, which comprises Figure 1 The water vapor recovery system in the flue gas is shown. Fig.11 , the method comprising:

[0210] Step S1101: when there are at least two abnormal temperature regions, determine the position of the target second pipeline corresponding to each abnormal temperature region.

[0211] When there are at least two temperature abnormality regions, it is necessary to select the second pipe at a position close to the temperature abnormality region as the target second pipe.

[0212] Step S1102: Determine whether the position distance between two adjacent target second pipelines is greater than a preset position distance.

[0213] The preset position distance is a preset constant. In some embodiments, if the second pipes are evenly distributed inside the flue gas cooling tower, it can be determined whether the number of second pipes between two adjacent target second pipes is greater than the preset number of pipes, for example, it can be determined whether the number of second pipes between two adjacent target second pipes is greater than 2.

[0214] Step S1103: If not, control the two target second pipes to inhale.

[0215] When the position distance between two adjacent target second pipes is less than the preset position distance, both target second pipes need to be controlled to inhale. If one target second pipe inhales and the other target second pipe exhausts, the smoke will only circulate between the two target second pipes and cannot circulate to other areas at the smoke outlet.

[0216] Step S1104: selecting an exhaust second pipeline from the remaining second pipelines according to the positions of the two target second pipelines.

[0217] Exemplarily, the sum of the distances from the remaining second pipes to the target second pipe is calculated, and the second pipe corresponding to the maximum distance sum is used as the exhaust second pipe.

[0218] Exemplarily, a connecting line segment is made with two target second pipes as endpoints, and a perpendicular bisector of the connecting line segment is made; two intersection points of the perpendicular bisector and the inner wall of the flue gas cooling tower are obtained; the intersection point farthest from the perpendicular point and the second pipe closest to the perpendicular point are taken as the second exhaust pipe.

[0219] Step S1105: Control the second exhaust pipe to exhaust.

[0220] Controlling the exhaust second pipe to exhaust and controlling the two target second pipes to inhale can make the smoke at the smoke outlet flow on a horizontal plane, thereby promoting the temperature balance of the smoke.

[0221] For example, please refer to Figure 2 A second pipe 111 draws the cooled flue gas from the flue gas cooling tower 1 and temporarily stores the cooled flue gas in the gas storage container 112, and another second pipe draws the cooled flue gas from the gas storage container and transports the cooled flue gas to the flue gas cooling tower 1.

[0222] Step S1106: If yes, one of the target second pipelines is controlled to inhale air, and the other target second pipeline is controlled to exhaust air.

[0223] When the position distance between two adjacent target second pipes is less than the preset position distance, by controlling one of the target second pipes to inhale and the other target second pipe to exhaust, the smoke can flow horizontally at the smoke outlet, thereby promoting the temperature balance of the smoke.

[0224] In summary, controlling different second pipes to perform air intake and exhaust respectively allows the flue gas at the flue gas outlet to flow on a horizontal plane, which helps to stabilize the flue gas temperature entering the desulfurization tower at a constant value, making it easier for the equipment behind the flue gas cooling tower to perform related operations.

[0225] The present application also discloses a method for cooling smoke inhalation, which comprises: Figure 1 The water vapor recovery system in the flue gas is shown. Fig.12 , the method comprising:

[0226] Step S1201: Acquire a first exhaust rate of a first pipeline, and acquire an intake rate and a second exhaust rate of a second pipeline.

[0227] Optionally, flow rate sensors are provided inside the first pipe and the second pipe, and the first exhaust rate, the air intake rate and the second exhaust rate can be obtained through the flow rate sensors.

[0228] Step S1202: Calculate the sum of the first exhaust rate and the second exhaust rate to obtain a total exhaust rate.

[0229] The communicating duct exhausts smoke through the first duct and the second duct, and therefore the total exhaust rate of the communicating duct is equal to the sum of the first exhaust rate and the second exhaust rate.

[0230] Step S1203: Determine whether the total exhaust rate is greater than the intake rate.

[0231] If the total exhaust rate is greater than the intake rate, execute step S1204;

[0232] If the total exhaust rate is less than the intake rate, execute step S1205.

[0233] Step S1204: If yes, then adjust the inhalation rate according to the difference between the total exhaust rate and the inhalation rate.

[0234] When the total exhaust rate is greater than the intake rate, it means that the intake rate of the connecting pipe is insufficient, resulting in an imbalance between the absorption and discharge of flue gas.

[0235] Optionally, the suction rate of the second pipe is increased according to the difference between the total exhaust rate and the suction rate. In some other embodiments, the number of second suction pipes can be increased, and the suction rate of the increased second pipes is equal to the difference between the total exhaust rate and the suction rate.

[0236] Step S1205: If not, adjusting the second exhaust rate according to the difference between the total exhaust rate and the intake rate.

[0237] When the total exhaust rate is less than the intake rate, it means that the exhaust rate of the connecting pipe is insufficient, resulting in an imbalance between the absorption and discharge of flue gas.

[0238] Optionally, the second exhaust rate of the second pipeline is increased according to the difference between the total exhaust rate and the inhalation rate. In some other embodiments, the number of second exhaust pipelines may be increased, and the exhaust rate of the increased second pipelines is equal to the difference between the total exhaust rate and the inhalation rate.

[0239] In summary, the air intake rate or the second air intake rate can be adjusted according to the total air exhaust rate and the air intake rate, so that the air intake and air exhaust of the communication pipe are balanced.

[0240] An embodiment of the present application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed for a method for recovering water vapor in flue gas.

[0241] Computer storage media include, for example, various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0242] Based on the same inventive concept, an embodiment of the present application provides an intelligent terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute a method for recovering water vapor in flue gas.

[0243] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0244] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. A method for recovering water vapor in flue gas, characterized in that: The method comprises: The high-temperature flue gas is transported to the flue gas cooling tower through the fan; The temperature of the high-temperature flue gas is reduced by the flue gas cooling tower to obtain cooled flue gas; The cooled flue gas is transported to the desulfurization tower, and the cooled flue gas is returned to the flue gas inlet of the flue gas cooling tower through a connecting pipe, wherein the connecting pipe includes a first pipe near the flue gas inlet, a gas storage container, and a second pipe near the flue gas outlet; Wherein, the step of returning the cooled flue gas to the flue gas inlet of the flue gas cooling tower through the connecting pipe comprises: obtaining a first temperature distribution of the flue gas cooling tower at the flue gas inlet; determining a high temperature area greater than a first preset temperature threshold according to the first temperature distribution; according to the relative position of the high temperature area and the first opening of the first pipe, taking the first pipe closest to the high temperature area as the target first pipe, the first opening being the opening of the first pipe on the flue gas cooling tower; determining a target ray from the target first pipe to the high temperature area; controlling the cooled flue gas to be discharged from the target first pipe along the target ray; In the case where there are at least two high-temperature regions, the high-temperature regions are combined in pairs to obtain a high-temperature region combination; for a target high-temperature region combination in the high-temperature region combination, a line is connected according to the high-temperature regions included in the target high-temperature region combination to obtain a candidate line; it is determined whether the candidate line passes through the first opening; if so, the first opening passed through is recorded as a candidate first opening, and a candidate distance from the candidate first opening to the high-temperature region included in the target high-temperature region combination is calculated; it is determined whether the candidate distance is less than the exhaust limit distance; if so, the cooling flue gas is controlled to be discharged from the first pipe corresponding to the candidate first opening along the candidate line; The desulfurization tower is used to remove sulfur dioxide from the cooled flue gas, and the cooled flue gas is transported to the flue gas mixing chamber; The flue gas temperature is lowered by drawing outside air through the axial flow fan in the flue gas mixing chamber.

2. The method for recovering water vapor in flue gas according to claim 1, characterized in that: The method further comprises: In a case where the candidate first openings correspond to at least two groups of target high temperature region combinations, determining the candidate connection lines corresponding to the at least two groups of target high temperature region combinations; Planning the exhaust direction change relationship of the candidate first opening according to the candidate connection line; acquiring an influence surface of the candidate first opening according to the exhaust direction change relationship and the exhaust limit distance; Determine whether there is a candidate high temperature area, so that the distance between the candidate high temperature area and the influence surface is less than a preset distance; If so, the exhaust direction change relationship is adjusted according to the candidate high temperature area.

3. The method for recovering water vapor in flue gas according to claim 1, characterized in that: The method further comprises: Determining whether the target ray intersects with the bottom slope of the flue gas cooling tower; If yes, decomposing the target ray into a vertical component perpendicular to the bottom slope and a horizontal component horizontal to the bottom slope according to the inclination angle of the bottom slope; Determine whether the horizontal component has a vertically upward component; If so, the first pipeline corresponding to the target first pipeline is updated to the target first pipeline.

4. The method for recovering water vapor in flue gas according to claim 1, characterized in that: The method further comprises: Acquire a second temperature distribution of the flue gas cooling tower at the flue gas outlet; Determine an abnormal temperature region greater than a second preset temperature threshold according to the second temperature distribution; According to the relative position between the abnormal temperature area and the second opening of the second pipe, the second pipe closest to the high temperature area is used as the target second pipe, and the second opening is the opening of the second pipe on the flue gas cooling tower; Determine an air intake line from the target second pipeline to the temperature abnormality area; The cooling flue gas is controlled to be sucked into the target second pipeline along the suction line.

5. The method for recovering water vapor in flue gas according to claim 4, characterized in that: The method further comprises: In the case where there are at least two abnormal temperature areas, determining a position of the target second pipeline corresponding to each abnormal temperature area; Determine whether the position distance between two adjacent target second pipelines is greater than a preset position distance; If not, the two target second pipelines are controlled to inhale; an exhaust second pipeline is selected from the remaining second pipelines according to the positions of the two target second pipelines; and the exhaust second pipeline is controlled to exhaust; If so, one of the target second pipelines is controlled to inhale, and the other target second pipeline is controlled to exhaust.

6. The method for recovering water vapor in flue gas according to claim 5, characterized in that: The method further comprises: Acquire a first exhaust rate of the first pipeline, and acquire an intake rate and a second exhaust rate of the second pipeline; Calculating the sum of the first exhaust rate and the second exhaust rate to obtain a total exhaust rate; Determining whether the total exhaust rate is greater than the intake rate; If yes, adjusting the inhalation rate according to the difference between the total exhaust rate and the inhalation rate; If not, the second exhaust rate is adjusted according to the difference between the total exhaust rate and the intake rate.

7. A system for recovering water vapor from flue gas, characterized in that: The system is used to perform the method for recovering water vapor in flue gas according to claim 1, and the system comprises a fan, a flue gas cooling tower, a desulfurization tower, a flue gas mixing chamber and a coolant circulation device; The fan is connected to the flue gas cooling tower, and the fan is used to transport the high-temperature flue gas to the flue gas cooling tower, and the flue gas cooling tower is used to reduce the temperature of the high-temperature flue gas to obtain cooled flue gas; The flue gas cooling tower is connected to the desulfurization tower, and the desulfurization tower is used to remove sulfur dioxide in the cooled flue gas. A connecting pipe is provided between the flue gas inlet and the flue gas outlet of the flue gas cooling tower, and the connecting pipe includes a first pipe near the flue gas inlet, a gas storage container, and a second pipe near the flue gas outlet; The bottom of the flue gas cooling tower is provided with an opening, and the coolant circulation device is connected to the flue gas cooling tower through the opening, and the coolant circulation device is used to circulate and recover the coolant used by the flue gas cooling tower; The desulfurization tower is connected to the flue gas mixing chamber, and the flue gas mixing chamber includes an axial flow fan. The axial flow fan is used to reduce the flue gas temperature and remove water vapor in the flue gas by extracting external air.

8. An intelligent terminal, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and executes any one of the methods according to claims 1 to 6.

9. A computer-readable storage medium, characterized in that: A computer program is stored which can be loaded by a processor and execute the method according to any one of claims 1 to 6.

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