A heat exchange exhaust gas recycling method, system, intelligent terminal and storage medium

Abstract

The application relates to a heat exchange waste gas recovery method and system, an intelligent terminal and a storage medium, and relates to the field of energy saving and emission reduction. The method comprises the following steps: after the heat exchange waste gas passes through a heat exchange device, the heat exchange waste gas is introduced into a recovery device; the recovery device comprises an inlet steam pipeline, an exhaust steam pipeline and a drainage pipeline; a control valve is arranged on the drainage pipeline; the recovery device is used for separating gas and liquid in the heat exchange waste gas to obtain recovered waste gas and recovered waste water; the recovered waste gas leaves the recovery device from the exhaust steam pipeline; the recovered waste water leaves the recovery device from the drainage pipeline; a real-time liquid level in the recovery device is obtained; a liquid level difference between the real-time liquid level and a first preset liquid level is calculated; according to the liquid level difference, the valve opening of the control valve is adjusted, so that the real-time liquid level is located between the first preset liquid level and a second preset liquid level, and the second preset liquid level is greater than the first preset liquid level. The application has the effect of ensuring the liquid level balance in the recovery device.

Description

Technical Field

[0001] This application relates to the field of energy conservation and emission reduction, and in particular to a method, system, intelligent terminal, and storage medium for recovering heat exchange waste gas. Background Technology

[0002] In waste-to-energy plants, the air entering the incinerator needs to be heated to ensure efficient waste incineration. To conserve resources, the exhaust gas produced by the incinerator is usually used to heat the air. After heat exchange, the exhaust gas undergoes gas-liquid separation to recover water from the exhaust gas.

[0003] In related technologies, heat exchange waste gas is introduced into a recovery device. A drain pipe is installed on the side wall of this recovery device, and a float valve is installed at the drain pipe. When the wastewater level in the recovery device increases, the float valve rises, increasing the opening of the drain pipe and allowing more wastewater to leave. When the wastewater level in the recovery device decreases, the float valve falls, decreasing the opening of the drain pipe and allowing less wastewater to leave, thus achieving a balance in the liquid level within the recovery device.

[0004] Regarding the aforementioned technologies, after prolonged use, the float valve is prone to jamming, leading to an imbalance in the float valve's adjustment of the liquid level. Summary of the Invention

[0005] To ensure liquid level balance within the recovery device, this application provides a method, system, intelligent terminal, and storage medium for recovering heat exchange waste gas.

[0006] In a first aspect, this application provides a method for recovering heat exchange waste gas, employing the following technical solution:

[0007] A method for recovering heat exchange waste gas, comprising:

[0008] After the heat exchange exhaust gas passes through the heat exchange device, the heat exchange exhaust gas is introduced into a recovery device. The recovery device includes an inlet steam pipe, an outlet steam pipe, and a drain pipe. A control valve is installed on the drain pipe. The recovery device is used to separate the gas and liquid in the heat exchange exhaust gas to obtain recovered exhaust gas and recovered wastewater. The recovered exhaust gas leaves the recovery device from the outlet steam pipe, and the recovered wastewater leaves the recovery device from the drain pipe.

[0009] Obtain the real-time liquid level within the recovery device;

[0010] Calculate the liquid level difference between the real-time liquid level and the first preset liquid level;

[0011] Based on the liquid level difference, the valve opening of the control valve is adjusted so that the real-time liquid level is between the first preset liquid level and the second preset liquid level, wherein the second preset liquid level is greater than the first preset liquid level.

[0012] By adopting the above technical solution, and by monitoring the liquid level in real time and dynamically adjusting the valve opening, the real-time liquid level is kept between the first preset liquid level and the second preset liquid level, which can prevent the recovered waste gas from escaping from the drainage pipe, polluting the environment, and affecting the recovery efficiency.

[0013] Optionally, a first real-time flow rate and a second real-time flow rate are obtained in the drainage pipe, wherein the first real-time flow rate is the flow rate of the recycled wastewater before it passes through the control valve, and the second real-time flow rate is the flow rate of the recycled wastewater after it passes through the control valve;

[0014] Obtain the current valve opening of the control valve;

[0015] Based on the first real-time flow rate and the current valve opening, the predicted flow rate is determined in a preset flow mapping table. The flow mapping table is used to represent the mapping relationship between the flow rate of recycled wastewater before and after the control valve and the valve opening.

[0016] Calculate the flow difference based on the second real-time flow and the predicted flow;

[0017] If the traffic difference is greater than the traffic difference threshold, the mapping relationship in the traffic mapping table is updated according to the traffic difference.

[0018] By adopting the above technical solution, the flow difference is calculated based on the second real-time flow and the predicted flow. When the flow difference is too large, the mapping relationship in the flow mapping table is updated according to the flow difference, so that the flow prediction is more in line with the current valve status and valve control failure is avoided due to valve performance degradation.

[0019] Optionally, the temperature of the recycled wastewater in the drainage pipe is obtained;

[0020] In the temperature-coefficient curve, a compensation coefficient corresponding to the wastewater temperature is determined. The compensation coefficient is used to compensate for the error of the control valve caused by the temperature effect.

[0021] Calculate the difference between the second real-time traffic and the predicted traffic to obtain the traffic difference;

[0022] The product of the compensation coefficient and the flow difference is calculated to obtain the flow difference value.

[0023] By adopting the above technical solution, a compensation coefficient corresponding to the wastewater temperature is determined in the temperature-coefficient curve. The difference between the second real-time flow rate and the predicted flow rate is calculated to obtain the flow difference. The product of the compensation coefficient and the flow difference is calculated to obtain the flow difference value. This eliminates the interference of temperature on flow measurement, improves the reliability of flow difference calculation, and eliminates the need to set up flow mapping tables for different temperatures.

[0024] Optionally, the steam inlet pipe includes an alkaline steam inlet pipe and an acidic steam inlet pipe, the heat exchange exhaust gas corresponding to the alkaline steam inlet pipe includes alkaline gas, and the heat exchange exhaust gas corresponding to the acidic steam inlet pipe includes acidic gas; the acidic steam inlet pipe is higher than the alkaline steam inlet pipe.

[0025] Obtain the first equivalent mass of alkaline gas in the alkaline steam inlet pipe and the second equivalent mass of acidic gas in the acidic steam inlet pipe;

[0026] Calculate the product of the first equivalent mass and the preset absorption ratio to obtain the first absorption amount of the alkaline gas;

[0027] Based on the first absorption amount and the reaction mode between the alkaline gas and the acidic gas, the reaction requirement of the acidic gas is obtained;

[0028] Based on the reaction demand and the second equivalent mass, the first absorption ratio of the acidic gas is obtained;

[0029] The target liquid level position is obtained based on the first absorption ratio, and the target liquid level position is used to represent the distance from the liquid level in the recovery device to the bottom of the acidic steam inlet pipe;

[0030] The valve opening is set according to the target liquid level position.

[0031] By adopting the above technical solution, the required amount of acidic gas for reaction is calculated based on the amount of alkaline gas. Then, the first absorption ratio of the acidic gas is obtained using the reaction requirement and the second equivalent mass. The liquid level in the recovery device is determined according to the first absorption ratio, optimizing the acid-base gas neutralization efficiency and reducing neutralizing agent waste.

[0032] Optionally, the pH value of the recycled wastewater is obtained;

[0033] If the pH value is greater than the upper limit or less than the lower limit, the valve opening is adjusted to the first preset opening.

[0034] Monitor the changes in the real-time liquid level;

[0035] If the real-time liquid level is located between the bottom of the alkaline steam inlet pipe and the top of the drain pipe, the valve opening is adjusted to a second preset opening, which is smaller than the first preset opening.

[0036] By adopting the above technical solution, when the pH value is greater than the upper limit or less than the lower limit, the valve opening is adjusted to the first preset opening to achieve rapid drainage. When the real-time liquid level is between the bottom of the alkaline steam inlet pipe and the top of the drain pipe, the valve opening is adjusted to the second preset opening to avoid the liquid level being too high and causing the recovered waste gas to escape.

[0037] Optionally, in response to the pH value being greater than the lower limit of pH value and less than the neutral value, a third preset liquid level and a fourth preset liquid level are obtained;

[0038] Adjust the valve opening so that the real-time liquid level is between the third preset liquid level and the fourth preset liquid level;

[0039] Update the real-time liquid level and the pH value;

[0040] The amount of alkaline gas required for neutralization is obtained based on the difference between the pH value and the neutral value.

[0041] The second absorption ratio of the alkaline gas is obtained based on the real-time liquid level;

[0042] Adjust the valve opening according to the neutralization requirement and the second absorption ratio.

[0043] By adopting the above technical solution, when the pH value is greater than the lower limit but less than the neutral value, the liquid level is controlled between the third and fourth preset liquid levels. This ensures efficient dissolution of alkaline gas and avoids excessive addition.

[0044] Optionally, at least two liquid level data points of the recycling device are acquired, the at least two liquid level data points corresponding to liquid levels at different locations;

[0045] The liquid level calm quantization value in the recovery device is obtained based on the variance of the at least two liquid level data.

[0046] The first absorption ratio is updated based on the liquid level calm quantification value to obtain the updated absorption ratio;

[0047] The target liquid level position corresponding to the updated absorption ratio is retrieved from the preset liquid level-ratio mapping table. The liquid level-ratio mapping table is used to map the relationship between the liquid level position and the absorption ratio.

[0048] By employing the above technical solution, a stable quantitative value of the liquid level within the recovery device is obtained based on the variance of at least two liquid level data points. This eliminates the interference of liquid level fluctuations on the calculation of the absorption ratio and improves the positioning accuracy of the target liquid level.

[0049] Secondly, this application provides a heat exchange waste gas recovery system, which adopts the following technical solution:

[0050] A heat exchange exhaust gas recovery system, comprising:

[0051] The acquisition module is used to acquire real-time liquid level and valve opening.

[0052] A memory for storing the program of the heat exchange waste gas recovery method;

[0053] The processor and the program in the memory can be loaded and executed by the processor to implement the heat exchange waste gas recovery method.

[0054] By adopting the above technical solution, and by monitoring the liquid level in real time and dynamically adjusting the valve opening, the real-time liquid level is kept between the first preset liquid level and the second preset liquid level, which can prevent the recovered waste gas from escaping from the drainage pipe, polluting the environment, and affecting the recovery efficiency.

[0055] Thirdly, this application provides a smart terminal, which adopts the following technical solution:

[0056] A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of the above methods.

[0057] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates ensuring liquid level balance within the recovery device, and adopts the following technical solution:

[0058] A computer-readable storage medium storing a computer program that can be loaded by a processor and executed any of the above-described methods for recovering heat exchange waste gas.

[0059] In summary, this application includes at least one of the following beneficial technical effects:

[0060] 1. By monitoring the liquid level in real time and dynamically adjusting the valve opening, the real-time liquid level is kept between the first preset liquid level and the second preset liquid level, which can prevent the recovered waste gas from escaping from the drainage pipe, polluting the environment, and affecting the recovery efficiency.

[0061] 2. Calculate the flow difference based on the second real-time flow rate and the predicted flow rate. If the flow difference is too large, update the mapping relationship in the flow mapping table according to the flow difference, so that the flow prediction is more in line with the current valve status and avoids valve control failure due to valve performance degradation;

[0062] 3. Calculate the required amount of acidic gas for the reaction based on the amount of alkaline gas, and obtain the first absorption ratio of the acidic gas using the reaction requirement and the second equivalent mass. Determine the liquid level in the recovery device according to the first absorption ratio to optimize the acid-base gas neutralization efficiency and reduce neutralizing agent waste. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of a heat exchange waste gas recovery device provided in an embodiment of this application.

[0064] Figure 2 This is a schematic flowchart of a heat exchange waste gas recovery method provided in an embodiment of this application.

[0065] Figure 3 This is a flowchart illustrating a method for updating a traffic mapping table provided in an embodiment of this application.

[0066] Figure 4 This is a flowchart illustrating a method for calculating flow difference provided in an embodiment of this application.

[0067] Figure 5 This is a flowchart illustrating a method for setting valve opening according to an embodiment of this application.

[0068] Figure 6 This is a flowchart illustrating a second method for setting valve opening according to an embodiment of this application.

[0069] Figure 7 This is a flowchart illustrating a third method for setting the valve opening degree provided in an embodiment of this application.

[0070] Figure 8 This is a schematic flowchart of a liquid level correction method provided in an embodiment of this application.

[0071] Figure 9 This is a schematic diagram of a heat exchange waste gas recovery system provided in an embodiment of this application. Detailed Implementation

[0072] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1 to 9 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0073] This application discloses a heat exchange waste gas recovery system. (Refer to...) Figure 1 The system includes a heat exchange device 11 and a recovery device 12. The recovery device 12 includes a steam inlet pipe 121, a steam outlet pipe 122 and a drain pipe 123. A control valve 1231 is installed on the drain pipe 123. The recovery device 12 is used to separate the gas and liquid in the heat exchange waste gas to obtain recovered waste gas and recovered wastewater. The recovered waste gas leaves the recovery device 12 from the steam outlet pipe 122 and the recovered wastewater leaves the recovery device 12 from the drain pipe 123.

[0074] In some embodiments, the steam inlet pipe 121 includes an alkaline steam inlet pipe and an acidic steam inlet pipe. The heat exchange exhaust gas corresponding to the alkaline steam inlet pipe includes alkaline gas, and the heat exchange exhaust gas corresponding to the acidic steam inlet pipe includes acidic gas. The acidic steam inlet pipe is higher than the alkaline steam inlet pipe.

[0075] This application discloses a method for recovering heat exchange waste gas. (Refer to...) Figure 2 The method includes:

[0076] Step S201: After the heat exchange exhaust gas passes through the heat exchange device, the heat exchange exhaust gas is introduced into the recovery device. The recovery device includes an inlet steam pipe, an outlet steam pipe, and a drain pipe. A control valve is installed on the drain pipe. The recovery device is used to separate the gas and liquid in the heat exchange exhaust gas to obtain recovered exhaust gas and recovered wastewater. The recovered exhaust gas leaves the recovery device from the outlet steam pipe, and the recovered wastewater leaves the recovery device from the drain pipe.

[0077] The heat exchange exhaust gas originates from the incineration exhaust gas produced by the waste-to-energy plant. To recover the heat from the incineration exhaust gas, it is passed through a heat exchange device to exchange heat between the exhaust gas and the air, thus heating the air before it enters the waste-to-energy plant. After passing through the heat exchange device, the incineration exhaust gas becomes heat exchange exhaust gas.

[0078] Step S202: Obtain the real-time liquid level in the recovery device.

[0079] Optionally, a level gauge is installed in the recovery device, and the real-time liquid level can be obtained through the level gauge.

[0080] Furthermore, multiple level gauges can be installed within the recovery device to acquire the level data from each gauge. The average of the level data is calculated to obtain the real-time level.

[0081] Step S203: Calculate the liquid level difference between the real-time liquid level and the first preset liquid level.

[0082] The first preset liquid level is the lowest acceptable liquid level for the recovery device. When the liquid level in the recovery device is too low, the drain pipe will be exposed above the liquid surface, causing the recovered waste gas to escape from the drain pipe.

[0083] Optionally, the first preset liquid level is the liquid level at which the surface of the recycled wastewater reaches the top of the drain pipe. Further, to reduce the probability of recycled waste gas escaping from the drain pipe, a target liquid level is obtained when the surface of the recycled wastewater reaches the top of the drain pipe. The sum of the errors between the target liquid level and the preset liquid level is calculated to obtain the first preset liquid level.

[0084] Step S204: Adjust the valve opening of the control valve according to the liquid level difference so that the real-time liquid level is between the first preset liquid level and the second preset liquid level, and the second preset liquid level is greater than the first preset liquid level.

[0085] In one implementation, the valve opening is determined based on the liquid level difference in a preset liquid level difference-valve opening mapping table. The liquid level difference and valve opening are positively correlated; that is, the larger the liquid level difference, the larger the valve opening. The liquid level difference-valve opening mapping table is used to record the correspondence between liquid level differences and valve openings.

[0086] The second preset liquid level is a preset empirical value, and technicians can adjust the value of the second preset liquid level.

[0087] By adopting the above technical solution, and by monitoring the liquid level in real time and dynamically adjusting the valve opening, the real-time liquid level is kept between the first preset liquid level and the second preset liquid level, which can prevent the recovered waste gas from escaping from the drainage pipe, polluting the environment, and affecting the recovery efficiency.

[0088] In the following embodiments, during the use of the control valve, the control valve itself will gradually age over time, thereby affecting the opening control of the control valve. To solve the aforementioned problem, this application discloses a method for updating a flow mapping table. (Refer to...) Figure 3 The method includes:

[0089] Step S301: Obtain the first real-time flow rate and the second real-time flow rate in the drainage pipe. The first real-time flow rate is the flow rate of the recycled wastewater before it passes through the control valve, and the second real-time flow rate is the flow rate of the recycled wastewater after it passes through the control valve.

[0090] Optionally, a first flow meter and a second flow meter are installed inside the drainage pipe, positioned on opposite sides of the control valve. The first flow meter is located closer to the recovery device, and the second flow meter is located further away from the recovery device. The first real-time flow rate can be obtained through the first flow meter, and the second real-time flow rate can be obtained through the second flow meter.

[0091] Furthermore, there can be multiple first flow meters, and the first flow reading of each first flow meter is obtained. The average of the first flow readings is calculated to obtain the first real-time flow rate.

[0092] Furthermore, there can be multiple second flow meters, and the second flow reading of each second flow meter is obtained. The average of the second flow readings is calculated to obtain the second real-time flow rate.

[0093] Step S302: Obtain the current valve opening of the control valve.

[0094] Optionally, a positioner is installed inside the control valve, which can output the valve opening degree of the control valve, thereby obtaining the current valve opening degree.

[0095] Step S303: Based on the first real-time flow rate and the current valve opening, determine the predicted flow rate in the preset flow mapping table. The flow mapping table is used to represent the mapping relationship between the recovered wastewater flow rate before and after the control valve and the valve opening.

[0096] The flow map records the mapping relationship between the recovered wastewater flow rate before and after the control valve and the valve opening under ideal conditions. This means the control valve itself is neither aged nor damaged. Furthermore, the flow map can be measured at the time the control valve leaves the factory.

[0097] The predicted flow rate represents the flow rate of the recovered wastewater after the control valve under ideal conditions.

[0098] Step S304: Calculate the traffic difference based on the second real-time traffic and the predicted traffic.

[0099] The flow difference is used to describe the error between the second real-time flow and the predicted flow. The calculation method for the flow difference can be found in [reference needed]. Figure 4 The embodiments shown are not described in detail here.

[0100] Step S305: If the flow difference is greater than the flow difference threshold, update the mapping relationship in the flow mapping table according to the flow difference.

[0101] The flow difference threshold is a preset empirical value, and technicians can adjust the specific value of the flow difference threshold according to actual needs.

[0102] If the flow difference exceeds the flow difference threshold, it indicates that the control valve may be aging or corroded, causing a significant deviation between the second real-time flow and the predicted flow. Therefore, the flow mapping table needs to be updated. For example, the mapping relationship between the first real-time flow, valve opening, and predicted flow is found in the flow mapping table, and this mapping relationship is updated to first real-time flow - valve opening - second real-time flow. Further, if the mapping relationship in the flow mapping table is set to inlet flow - valve opening - valve flow, the mapping relationship is updated to inlet flow - valve opening - (valve flow + flow difference).

[0103] In some other embodiments, if the flow difference is less than the flow difference threshold, it indicates that there is no large difference between the second real-time flow and the predicted flow, and the control valve is operating well.

[0104] By adopting the above technical solution, the flow difference is calculated based on the second real-time flow and the predicted flow. When the flow difference is too large, the mapping relationship in the flow mapping table is updated according to the flow difference, so that the flow prediction is more in line with the current valve status and valve control failure is avoided due to valve performance degradation.

[0105] In the following embodiments, when calculating the flow difference, the recovered wastewater itself has a certain temperature, and the control valve is affected by thermal expansion and contraction, leading to inaccurate valve opening. Therefore, in this application, the flow difference is corrected based on temperature to ensure the accuracy of subsequent steps. This application discloses a method for calculating the flow difference. (Refer to...) Figure 4 The method includes:

[0106] Step S401: Obtain the temperature of the wastewater being recycled in the drainage pipe.

[0107] Optionally, a temperature sensor is installed inside the drainage pipe, and the wastewater temperature can be obtained through the temperature sensor.

[0108] Furthermore, multiple temperature sensors can be installed inside the drainage pipe to acquire temperature data from each sensor. The average of the temperature data is then calculated to obtain the wastewater temperature.

[0109] Step S402: In the temperature-coefficient curve, determine the compensation coefficient corresponding to the wastewater temperature. The compensation coefficient is used to compensate for the error of the control valve caused by the temperature.

[0110] Temperature-coefficient curves can be obtained by technicians through repeated experimental measurements.

[0111] Step S403: Calculate the difference between the second real-time traffic and the predicted traffic to obtain the traffic difference.

[0112] The flow difference refers to the difference between the second real-time flow and the predicted flow.

[0113] Step S404: Calculate the product of the compensation coefficient and the flow difference to obtain the flow difference value.

[0114] By calculating the product of the compensation coefficient and the flow difference, the flow difference can be adjusted using the wastewater temperature to make it conform to the influence of the wastewater temperature on the control valve.

[0115] By adopting the above technical solution, a compensation coefficient corresponding to the wastewater temperature is determined in the temperature-coefficient curve. The difference between the second real-time flow rate and the predicted flow rate is calculated to obtain the flow difference. The product of the compensation coefficient and the flow difference is calculated to obtain the flow difference value. This eliminates the interference of temperature on flow measurement, improves the reliability of flow difference calculation, and eliminates the need to set up flow mapping tables for different temperatures.

[0116] In the following embodiments, the steam inlet pipe of the recovery device may include an alkaline steam inlet pipe for introducing alkaline gas and an acidic steam inlet pipe for introducing acidic gas, so that the alkaline and acidic gases dissolve in the recovered wastewater and achieve acid-base neutralization. Therefore, this application discloses a method for setting the valve opening degree. (Refer to...) Figure 5 The method includes:

[0117] Step S501: Obtain the first equivalent mass of alkaline gas in the alkaline steam inlet pipe and the second equivalent mass of acidic gas in the acidic steam inlet pipe.

[0118] Optionally, the steam inlet pipeline includes an alkaline steam inlet pipeline and an acidic steam inlet pipeline. The heat exchange exhaust gas corresponding to the alkaline steam inlet pipeline includes alkaline gas, and the heat exchange exhaust gas corresponding to the acidic steam inlet pipeline includes acidic gas. The acidic steam inlet pipeline is positioned higher than the alkaline steam inlet pipeline. For example, the acidic gas is sulfur dioxide, and the alkaline gas is ammonia or a gas containing calcium hydroxide powder.

[0119] Alternatively, alkaline and acidic gases are output from incinerators in waste-to-energy plants that burn different types of materials. For example, sulfur dioxide is a product of the combustion of sulfur-containing compounds, and ammonia is generated from the decomposition of nitrogen-containing waste.

[0120] The first equivalent mass refers to the mass of alkaline gas entering the recovery unit through the alkaline steam inlet pipe per unit time. Optionally, the content and type of alkaline gas are obtained using a first gas analyzer. The first equivalent mass is obtained based on the aforementioned content and type of alkaline gas.

[0121] The second equivalent mass refers to the mass of acidic gas entering the recovery unit from the acidic steam inlet pipe per unit time. Optionally, the content and type of acidic gas are obtained using a second gas analyzer. The second equivalent mass is obtained based on the aforementioned content and type of acidic gas.

[0122] Step S502: Calculate the product of the first equivalent mass and the preset absorption ratio to obtain the first absorption amount of alkaline gas.

[0123] The preset absorption ratio refers to the proportion of alkaline gases absorbed by the recycled wastewater. Specifically, the preset absorption ratio is the proportion of alkaline gases absorbed when the wastewater level is higher than the alkaline steam inlet pipe. In practical scenarios, the amount of alkaline gas generated is less than the amount of acidic gas generated. Therefore, in conventional treatment processes, it is necessary to adjust the positional relationship between the wastewater level and the acidic steam inlet pipe while ensuring the liquid level is above the alkaline steam inlet pipe. This controls the amount of acidic gas dissolved in the recycled wastewater, thereby achieving acid-base balance in the recycled wastewater.

[0124] Step S503: Based on the first absorption amount and the reaction mode between the alkaline gas and the acidic gas, obtain the reaction requirement of the acidic gas.

[0125] The reaction mode refers to the chemical reaction formula between a basic gas and an acidic gas. For example, sulfur dioxide dissolves in water to form H2SO3, H2SO3 + NH3 → NH4HSO3.

[0126] The reaction requirement refers to the mass of acidic gas required to neutralize the first amount of alkaline gas absorbed.

[0127] Step S504: Based on the reaction demand and the second equivalent mass, obtain the first absorption ratio of acidic gas.

[0128] The first absorption ratio refers to the proportion of acidic gas absorbed by the recycled wastewater. This ratio is related to the liquid level; when the liquid level is between the top and bottom of the acidic gas inlet pipe, the higher the liquid level, the larger the contact area and the longer the contact time for the acidic gas as it enters the recycling device. Therefore, in this embodiment, the first absorption ratio of the acidic gas needs to be adjusted by controlling the liquid level, and the amount of acidic gas dissolved in the recycled wastewater is adjusted accordingly.

[0129] For example, the ratio of the second equivalent mass to the reaction requirement is calculated to obtain the first absorption ratio.

[0130] Step S505: Obtain the target liquid level position according to the first absorption ratio. The target liquid level position is used to indicate the distance from the liquid level in the recovery device to the bottom of the acidic steam inlet pipe.

[0131] For example, in the first absorption ratio-liquid level mapping table, the target liquid level position is determined based on the first absorption ratio. The first absorption ratio-liquid level mapping table is used to record the mapping relationship between the first absorption ratio of the acidic gas and the liquid level.

[0132] Optionally, the target liquid level height can be obtained based on the target liquid level position and the position of the acidic steam inlet pipe in the recovery device. The target liquid level height refers to the liquid level of the recovered wastewater in the recovery device.

[0133] Step S506: Set the valve opening according to the target liquid level position.

[0134] For example, the valve opening is adjusted to maintain the level of the recycled wastewater at the target liquid level.

[0135] By adopting the above technical solution, the required amount of acidic gas for reaction is calculated based on the amount of alkaline gas. Then, the first absorption ratio of the acidic gas is obtained using the reaction requirement and the second equivalent mass. The liquid level in the recovery device is determined according to the first absorption ratio, optimizing the acid-base gas neutralization efficiency and reducing neutralizing agent waste.

[0136] In the following embodiments, the pH value of the recycled wastewater may become abnormal, making it difficult to adjust the pH value by introducing acidic and alkaline gases. Therefore, this application discloses a second method for setting the valve opening. (Refer to...) Figure 6 The method includes:

[0137] Step S601: Obtain the pH value of the recycled wastewater.

[0138] Optionally, a pH meter is installed at the drainage pipe of the recycling device to obtain the acidity or alkalinity of the recycled wastewater from the pH meter reading.

[0139] Step S602: If the pH value is greater than the upper limit or less than the lower limit, adjust the valve opening to the first preset opening.

[0140] The upper and lower limits of pH value are preset empirical values. For example, the upper limit of pH value is 8.7 and the lower limit of pH value is 5.0.

[0141] For example, the first preset opening degree is 90%. When the control valve is at the first preset opening degree, the liquid level in the recovery device will drop at a relatively fast rate.

[0142] Step S603: Monitor the real-time changes in liquid level.

[0143] For example, the real-time liquid level is acquired once every preset time interval. The preset time interval is a preset value. For example, the preset time interval is 1 second.

[0144] Step S604: If the real-time liquid level is between the bottom of the alkaline steam inlet pipe and the top of the drain pipe, adjust the valve opening to the second preset opening, which is less than the first preset opening.

[0145] When the real-time liquid level is between the bottom of the alkaline steam inlet pipe and the top of the drain pipe, the valve opening needs to be reduced promptly to prevent the liquid level from dropping too quickly, causing the drain pipe to be exposed and allowing gas to escape from it. For example, the second preset opening is 5%. At the second preset opening, the liquid level in the recovery device can be kept stable or the rate of liquid level rise can be less than the preset rate.

[0146] Furthermore, after adjusting the valve opening to the second preset opening, since the heat exchange exhaust gas continues to enter the recovery device, the wastewater in the heat exchange exhaust gas will continuously replenish the recovery device. Simultaneously, maintaining the valve opening at the second preset opening allows a certain amount of recovered wastewater to leave, ensuring a stable liquid level within the recovery device. Through this process, the pH value of the recovered wastewater can be brought closer to neutral.

[0147] By adopting the above technical solution, when the pH value is greater than the upper limit or less than the lower limit, the valve opening is adjusted to the first preset opening to achieve rapid drainage. When the real-time liquid level is between the bottom of the alkaline steam inlet pipe and the top of the drain pipe, the valve opening is adjusted to the second preset opening to avoid the liquid level being too high and causing the recovered waste gas to escape.

[0148] In the following embodiments, the bottom of the acidic steam inlet pipe is lower than the top of the alkaline steam inlet pipe, resulting in an overlap between the two pipes in the horizontal direction. When the recovered wastewater is weakly acidic, it is necessary to appropriately reduce the amount of alkaline gas dissolved to better control the pH of the recovered wastewater. This application discloses a third method for setting the valve opening. (Refer to...) Figure 7 The method includes:

[0149] Step S701: In response to the pH value being greater than the lower limit of pH value and less than the neutral value, obtain the third preset liquid level and the fourth preset liquid level.

[0150] Provided that the bottom of the acidic steam inlet pipe is lower than the top of the alkaline steam inlet pipe, the third preset liquid level corresponds to the bottom of the acidic steam inlet pipe, and the fourth preset liquid level corresponds to the overlapping area of ​​the acidic and alkaline steam inlet pipes in the horizontal direction. Furthermore, the first absorption ratio corresponding to the fourth preset liquid level is less than the minimum preset ratio value. When the distance between the liquid level and the bottom of the acidic steam inlet pipe is small, the absorption effect of the recovered wastewater on acidic gases is poor, and it can be basically considered that the recovered wastewater does not absorb acidic gases.

[0151] Step S702: Adjust the valve opening to make the real-time liquid level between the third preset liquid level and the fourth preset liquid level.

[0152] For example, by adjusting the valve opening, the real-time liquid level is adjusted by controlling the discharge rate of the recycled wastewater in the recycling device, so that the real-time liquid level is between the third preset liquid level and the fourth preset liquid level.

[0153] Step S703: Update real-time liquid level and pH value.

[0154] For example, the real-time liquid level and pH value are acquired once every preset time interval. The preset time interval is a preset value. For example, the preset time interval is 1 second.

[0155] Step S704: Based on the difference between the acid-base value and the neutral value, obtain the amount of alkaline gas required for neutralization.

[0156] Neutralization requirement refers to the mass of alkaline gas required to bring the pH of the recovered waste gas to a neutral value.

[0157] Step S705: Obtain the second absorption ratio of alkaline gas based on the real-time liquid level.

[0158] For example, in the second absorption ratio-liquid level mapping table, the target second absorption ratio is determined based on the real-time liquid level. The second absorption ratio-liquid level mapping table is used to record the mapping relationship between the second absorption ratio of alkaline gas and the liquid level.

[0159] Step S706: Adjust the valve opening according to the neutralization demand and the second absorption ratio.

[0160] For example, the product of the first equivalent mass and the second absorption ratio is calculated to obtain the absorbed mass of alkaline gas per unit time. The ratio of the neutralization requirement to the absorbed mass is calculated to obtain the absorption time. Within the absorption time, the valve opening is adjusted so that the real-time liquid level is between the third and fourth preset liquid levels.

[0161] By adopting the above technical solution, when the pH value is greater than the lower limit but less than the neutral value, the liquid level is controlled between the third and fourth preset liquid levels. This ensures efficient dissolution of alkaline gas and avoids excessive addition.

[0162] In the following embodiments, when the heat exchange exhaust gas enters the recovery device through the steam inlet pipe, the exhaust gas causes disturbance to the liquid level, thereby affecting the accuracy of the liquid level. Therefore, this application discloses a liquid level correction method. (Refer to...) Figure 8 The method includes:

[0163] Step S801: Obtain at least two liquid level data from the recovery device, with the at least two liquid level data corresponding to liquid levels at different locations.

[0164] Optionally, the liquid level data is obtained through level gauges installed in the recovery device. The distance between the level gauges needs to be greater than the preset installation distance, which is a preset empirical value, to ensure the independence of liquid level data sampling.

[0165] Step S802: Obtain the calm quantification value of the liquid level in the recovery device based on the variance of at least two liquid level data.

[0166] Optionally, the variance of at least two liquid level data points is calculated. The variance is then normalized to obtain the quantified value of the liquid level in the recovery device.

[0167] Step S803: In the preset liquid level-ratio mapping table, retrieve the theoretical liquid level position corresponding to the first absorption ratio. The liquid level-ratio mapping table is used to map the relationship between the liquid level position and the absorption ratio.

[0168] The data in the liquid level-proportion mapping table can be obtained by technicians through repeated experiments.

[0169] Step S804: Update the theoretical liquid surface position based on the liquid surface calm quantization value to obtain the target liquid surface position.

[0170] For example, determine the liquid level height corresponding to the theoretical liquid level position. Calculate the product of the liquid level calm quantization value and the theoretical liquid level to obtain the target liquid level height. Convert the target liquid level height into a target liquid level position.

[0171] By employing the above technical solution, a stable quantitative value of the liquid level within the recovery device is obtained based on the variance of at least two liquid level data points. This eliminates the interference of liquid level fluctuations on the calculation of the absorption ratio and improves the positioning accuracy of the target liquid level.

[0172] Based on the same inventive concept, this application provides a heat exchange waste gas recovery system, please refer to... Figure 9 The system includes:

[0173] The acquisition module 901 is used to acquire real-time liquid level and valve opening.

[0174] The memory 902 is used to store the program for the above-described method for recovering heat exchange waste gas;

[0175] The processor 903 can load and execute the program in the memory to implement the above-mentioned method for recovering heat exchange waste gas.

[0176] By adopting the above technical solution, and by monitoring the liquid level in real time and dynamically adjusting the valve opening, the real-time liquid level is kept between the first preset liquid level and the second preset liquid level, which can prevent the recovered waste gas from escaping from the drainage pipe, polluting the environment, and affecting the recovery efficiency.

[0177] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be 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 be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0178] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a method for recovering heat exchange waste gas.

[0179] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0180] Based on the same inventive concept, embodiments of this application provide a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed to recover heat exchange waste gas.

[0181] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be 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 be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0182] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for recovering heat exchange waste gas, characterized in that, The method includes: After the heat exchange exhaust gas passes through the heat exchange device, the heat exchange exhaust gas is introduced into a recovery device. The recovery device includes an inlet steam pipe, an outlet steam pipe, and a drain pipe. A control valve is installed on the drain pipe. The recovery device is used to separate the gas and liquid in the heat exchange exhaust gas to obtain recovered exhaust gas and recovered wastewater. The recovered exhaust gas leaves the recovery device from the outlet steam pipe, and the recovered wastewater leaves the recovery device from the drain pipe. Obtain the real-time liquid level within the recovery device; Calculate the liquid level difference between the real-time liquid level and the first preset liquid level; Based on the liquid level difference, adjust the valve opening of the control valve so that the real-time liquid level is between the first preset liquid level and the second preset liquid level, and the second preset liquid level is greater than the first preset liquid level. The steam inlet pipe includes an alkaline steam inlet pipe and an acidic steam inlet pipe. The heat exchange exhaust gas corresponding to the alkaline steam inlet pipe includes alkaline gas, and the heat exchange exhaust gas corresponding to the acidic steam inlet pipe includes acidic gas. The acidic steam inlet pipe is higher than the alkaline steam inlet pipe. The method further includes: Obtain the first equivalent mass of alkaline gas in the alkaline steam inlet pipe and the second equivalent mass of acidic gas in the acidic steam inlet pipe; Calculate the product of the first equivalent mass and the preset absorption ratio to obtain the first absorption amount of the alkaline gas; Based on the first absorption amount and the reaction mode between the alkaline gas and the acidic gas, the reaction requirement of the acidic gas is obtained; Based on the reaction demand and the second equivalent mass, the first absorption ratio of the acidic gas is obtained; The target liquid level position is obtained based on the first absorption ratio, and the target liquid level position is used to represent the distance from the liquid level in the recovery device to the bottom of the acidic steam inlet pipe; The valve opening is set according to the target liquid level position.

2. The method for recovering heat exchange waste gas according to claim 1, characterized in that, The method further includes: The first real-time flow rate and the second real-time flow rate in the drainage pipe are obtained. The first real-time flow rate is the flow rate of the recycled wastewater before it passes through the control valve, and the second real-time flow rate is the flow rate of the recycled wastewater after it passes through the control valve. Obtain the current valve opening of the control valve; Based on the first real-time flow rate and the current valve opening, the predicted flow rate is determined in a preset flow mapping table. The flow mapping table is used to represent the mapping relationship between the flow rate of recycled wastewater before and after the control valve and the valve opening. Calculate the flow difference based on the second real-time flow and the predicted flow; If the traffic difference is greater than the traffic difference threshold, the mapping relationship in the traffic mapping table is updated according to the traffic difference.

3. The method for recovering heat exchange waste gas according to claim 2, characterized in that, The step of calculating the traffic difference based on the second real-time traffic and the predicted traffic includes: Obtain the temperature of the recycled wastewater in the drainage pipe; In the temperature-coefficient curve, a compensation coefficient corresponding to the wastewater temperature is determined. The compensation coefficient is used to compensate for the error of the control valve caused by the temperature effect. Calculate the difference between the second real-time traffic and the predicted traffic to obtain the traffic difference; The product of the compensation coefficient and the flow difference is calculated to obtain the flow difference value.

4. The method for recovering heat exchange waste gas according to claim 1, characterized in that, The method further includes: Obtain the pH value of the recycled wastewater; If the pH value is greater than the upper limit or less than the lower limit, the valve opening is adjusted to the first preset opening. Monitor the changes in the real-time liquid level; If the real-time liquid level is located between the bottom of the alkaline steam inlet pipe and the top of the drain pipe, the valve opening is adjusted to a second preset opening, which is smaller than the first preset opening.

5. The method for recovering heat exchange waste gas according to claim 4, characterized in that, The bottom of the acidic steam inlet pipe is lower than the top of the alkaline steam inlet pipe; The method further includes: In response to the pH value being greater than the lower limit of pH value and less than the neutral value, a third preset liquid level and a fourth preset liquid level are obtained; Adjust the valve opening so that the real-time liquid level is between the third preset liquid level and the fourth preset liquid level; Update the real-time liquid level and the pH value; The amount of alkaline gas required for neutralization is obtained based on the difference between the pH value and the neutral value. The second absorption ratio of the alkaline gas is obtained based on the real-time liquid level; Adjust the valve opening according to the neutralization requirement and the second absorption ratio.

6. The method for recovering heat exchange waste gas according to claim 1, characterized in that, The step of obtaining the target liquid level position based on the first absorption ratio includes: Acquire at least two liquid level data points of the recycling device, wherein the at least two liquid level data points correspond to liquid levels at different locations; The liquid level calm quantization value in the recovery device is obtained based on the variance of the at least two liquid level data. In a preset liquid level-ratio mapping table, the theoretical liquid level position corresponding to the first absorption ratio is retrieved. The liquid level-ratio mapping table is used to map the relationship between the liquid level position and the absorption ratio. The theoretical liquid level position is updated based on the liquid level calm quantization value to obtain the target liquid level position.

7. A heat exchange waste gas recovery system, characterized in that, The system is used to perform the method for recovering heat exchange waste gas as described in any one of claims 1 to 6, the system comprising: The acquisition module is used to acquire real-time liquid level and valve opening. A memory for storing the program of the heat exchange waste gas recovery method; The processor and the program in the memory can be loaded and executed by the processor to implement the heat exchange waste gas recovery method.

8. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and executed as described in any one of claims 1 to 6.

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