A kind of pry dress equipment of evaporating, drying, salt in one

Abstract

This invention relates to a skid-mounted device integrating evaporation, drying, and salt discharge, belonging to the field of wastewater treatment technology. It includes a device body, a sensing module, and a control module, with the control module electrically connected to the sensing module. The device body includes a reaction vessel for holding wastewater, containing a stirring paddle with a heat exchange module, and the paddle is driven to rotate by a drive motor. The sensing module includes a current sensor and a temperature sensor. The current sensor monitors the drive motor current and uploads the data to the control module, while the temperature sensor monitors the temperature inside the reaction vessel and uploads the data to the control module. The control module calculates a comprehensive environmental coefficient based on the difference between the motor current and a preset current, and the difference between the temperature inside the vessel and the temperature of the heat transfer medium. When the control module determines that the comprehensive environmental coefficient meets the requirements, it instructs the salt discharge process to start.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a skid-mounted device that integrates evaporation, drying, and salt discharge. Background Technology

[0002] Industrial wastewater generally contains high concentrations of inorganic salts. If this wastewater is discharged without treatment, it will cause significant pollution. Therefore, it is necessary to purify and separate these inorganic salts from the wastewater.

[0003] A typical device, such as the high-salt wastewater vacuum continuous evaporation and drying integrated machine disclosed in Chinese patent CN106115822A, includes: a shell with a secondary steam outlet; a heater disposed inside the shell and having a heat exchange chamber, the heater's axis being horizontal, and the heater's outer wall serving as a heating surface; this high-salt wastewater vacuum continuous evaporation and drying integrated machine sprays material onto the heating surface of the heater through a distribution pipe, forming a continuous thin layer of material on the heating surface, and then uses steam to evaporate the solvent in the liquid material, causing the solid material to precipitate.

[0004] During equipment operation, a monitoring system is relied upon to monitor the equipment's operating status. A typical monitoring system, such as the one disclosed in Chinese patent CN207347329U, uses a pH meter to monitor the pH value of the evaporator in real time and interlocks with a solenoid valve to control the amount of HCl added, thereby reducing human error and saving labor.

[0005] However, some of the aforementioned evaporation and drying wastewater treatment equipment is designed as skid-mounted units. The modular and mobile nature of skid-mounted equipment is intended to adapt to mobile or distributed deployment scenarios. In distributed deployment scenarios, real-time monitoring by on-site personnel may be impossible. Therefore, such equipment heavily relies on sensor and remote monitoring. The accuracy and detail of this monitoring determine the equipment's normal operation, as parameters such as resistance, temperature, and pressure within the equipment undergo significant changes during operation and are directly related to its performance. A single solution, as disclosed in CN207347329U, only monitors a single parameter and relies on the monitoring results for adjustments, resulting in low monitoring accuracy. This deficiency can be overcome by frequent manual inspections in fixed equipment, but it becomes a serious problem in skid-mounted equipment where there is little or no manual inspection. Therefore, a skid-mounted unit integrating evaporation, drying, and salt discharge, with high monitoring accuracy and adaptable to the operating scenarios of skid-mounted equipment, is needed. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, this invention provides a skid-mounted device that integrates evaporation, drying, and salt extraction, featuring high monitoring accuracy and compatibility with skid-mounted equipment.

[0007] The objective of this invention can be achieved through the following technical solutions: A skid-mounted device integrating evaporation, drying, and salt extraction includes a device body, a sensing module, and a control module, wherein the control module is electrically connected to the sensing module. The equipment body includes a reaction vessel for holding wastewater. The reaction vessel is equipped with a stirring paddle, which is equipped with a heat exchange module. The stirring paddle is driven to rotate by a drive motor. The sensing module includes a current sensor and a temperature sensor. The current sensor is used to monitor the current of the drive motor and upload it to the control module. The temperature sensor is used to monitor the temperature inside the reactor and upload it to the control module. The control module calculates a comprehensive environmental coefficient based on the difference between the motor current and the preset current, and the difference between the temperature inside the reactor and the temperature of the heat medium. When the control module determines that the comprehensive environmental coefficient meets the conditions, it instructs the salt discharge process to start.

[0008] As a preferred technical solution of the present invention, the control module calculates the comprehensive environmental coefficient Z based on the current data I and the temperature data T. The control module determines whether Z is less than Z0, and if the determination result is yes, it instructs the salt discharge process to start, where Z = [(|I-I0| / I0) + (|T-T0| / T0)] × c, I0 is the preset current input, T0 is the preset heat medium temperature, and c is the preset correction coefficient.

[0009] As a preferred embodiment of the present invention, the sensing module further includes a vibration sensor, which is used to collect the current vibration and upload it to the control module. The control module calculates the comprehensive environmental coefficient based on the vibration correction current data.

[0010] As a preferred technical solution of the present invention, the control module calculates the comprehensive environmental coefficient Z based on the vibration correction current data Ix, where Ix = Ik × V, where k is the correction coefficient and V is the vibration intensity.

[0011] As a preferred embodiment of the present invention, the control module is used to statistically analyze the cumulative value of the correction current over a period of time and determine whether the cumulative value of the current exceeds the standard cumulative value. When the control module determines that the cumulative value exceeds the standard cumulative value, it uses the cumulative value and the standard cumulative value to correct the comprehensive environmental coefficient Z.

[0012] As a preferred embodiment of the present invention, the control module obtains the corrected current data Ix, then obtains the function F(t) of the corrected current data changing with time, and calculates the cumulative value J of the corrected current over a period of time. The control module determines whether Z×A1 is less than Z0, and if the determination result is yes, it instructs the salt discharge process to start, where J= A1 = 1 + [(J / J0 - 1) × d)], where t0 is the pre-inputted statistical time period length, d is the pre-inputted correction coefficient, J0 is the pre-inputted standard cumulative value, and 0.8 ≤ A1 ≤ 1.2. When the calculation result shows A1 < 0.8, the control module sets A1 = 0.8; when the calculation result shows A1 > 1.2, the control module sets A1 = 1.2.

[0013] As a preferred embodiment of the present invention, it further includes a control panel, which is electrically connected to the control module. The control panel is used to display the values ​​of V, Ix, and Z, and is used to input the values ​​of c, T0, I0, and k.

[0014] The beneficial effects of this invention are as follows: (1) By setting the control module to calculate the comprehensive environmental coefficient based on the difference between the motor current and the preset current and the difference between the temperature inside the vessel and the temperature of the heat medium, the control module commands the salt discharge process to start when it determines that the comprehensive environmental coefficient meets the conditions. Compared with the single parameter monitoring scheme and the adjustment scheme based on single parameter monitoring, the monitoring accuracy and adjustment accuracy are improved, and it is more suitable for the operation of skid-mounted equipment under unattended conditions. (2) By using vibration sensors to collect current vibration, and then calculating the comprehensive environmental coefficient based on the vibration correction current data, the current is excluded when the vibration affects the accuracy of current collection due to the possibility that the skid-mounted equipment may not be securely installed. This improves the accuracy of monitoring. (3) By using the cumulative value that is less affected by random fluctuations in numerical values ​​to correct the comprehensive environmental coefficient, when the comprehensive environmental coefficient is calculated using real-time current and is greatly affected by random fluctuations in data, the comprehensive environmental coefficient is corrected by using the characteristic that the integral mean of random noise approaches zero and the integral value can reflect the trend, so that the comprehensive environmental coefficient can better represent the environment inside the reactor. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a module topology diagram of the present invention. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0018] Please see Figure 1A skid-mounted device integrating evaporation, drying, and salt extraction includes a device body, a sensing module, and a control module, wherein the control module is electrically connected to the sensing module. The equipment body includes a reaction vessel for holding wastewater. The reaction vessel is equipped with a stirring paddle, which contains a heat exchange module. The stirring paddle is driven to rotate by a drive motor. Specifically, the reactor is cylindrical in shape and is used to hold high-salt wastewater or other liquid materials that need to be evaporated and concentrated. The bottom of the reactor is equipped with a feed inlet and the top of the reactor is equipped with a gas outlet. The gas outlet is connected to a three-phase separator and the three-phase separator is connected to a condenser. A salt discharge port is provided at the bottom of one end of the reactor shaft, and an electric salt discharge valve is installed at the salt discharge port; The stirring paddle inside the reactor includes a stirring shaft, which is coaxially arranged with the cylindrical reactor. Multiple sets of blades are installed on the stirring shaft. The blades are hollow and form a heat exchange channel. One end of the stirring shaft penetrates the side wall of the reactor, extends out of the reactor, and is connected to a rotary joint. The blades are designed with an arc or continuous arc surface, which can push the salt produced by drying at the bottom of the reactor to the salt discharge port during rotation, thus achieving the function of discharging the material. One end of the stirring shaft extends out of the reactor and is connected to an external heat medium supply pipeline via a rotary joint. The heat medium can be one of steam, hot water, or heat transfer oil. The other end of the stirring shaft is connected to a drive motor. The drive motor drives the stirring shaft and stirring blades to rotate. Thus, while stirring the material, the heat medium flows through the heat exchange channel inside the stirring blades, and the heat is transferred to the material after being diffused through the blades, causing the moisture in the material to evaporate. The above structure is a conventional mechanical structure of a low-temperature evaporation and drying integrated machine, and will not be described in detail here; The control module uses a programmable logic controller or an embedded industrial controller, which internally stores parameters such as preset current I0, preset heat medium temperature T0, standard cumulative value J0, correction coefficient c, correction coefficient k, correction coefficient d, statistical time period length t0, and comprehensive environmental coefficient threshold Z0. During equipment operation, relying solely on a single parameter for monitoring has insufficient accuracy. For example, when monitoring only the motor current, an increase in current may be caused by increased material viscosity or a mechanical failure of the stirring shaft; when monitoring only the temperature, reaching the set temperature may simply mean that the heat medium is supplying sufficient heat, but the material has not yet been concentrated. For skid-mounted equipment, its use is often unattended, and manual inspection cannot compensate for misjudgments based on a single parameter. Therefore, a control method that can comprehensively assess multiple parameters is needed. Therefore, the control module calculates the comprehensive environmental coefficient based on the difference between the motor current and the preset current, as well as the difference between the temperature inside the vessel and the temperature of the heat medium. When the control module determines that the comprehensive environmental coefficient meets the conditions, it instructs the salt discharge process to start. Specifically, the control module calculates the comprehensive environmental coefficient Z based on the current data I and the temperature data T. The control module determines whether Z is less than Z0, and if the determination result is yes, it instructs the salt discharge process to start. Z = (|I-I0| / I0) + (|T-T0| / T0) × c, where I0 is the preset current input, T0 is the preset heat medium temperature, the heat medium temperature T0 is set according to the process requirements, for example, a fixed value between 80℃ and 90℃, and c is the preset correction coefficient. The physical meaning of Z=[(|I-I0| / I0)+(|T-T0| / T0)]×c is: (|I-I0| / I0) represents the normalization operator of the deviation of the current from the preset value, and (|T-T0| / T0) represents the normalization operator of the deviation of the heat medium temperature from the preset value. Only when both values ​​are relatively close to I0 or T0 can Z obtain a smaller value. When Z is small, less than Z0, it indicates that the motor current is close to the preset current and the temperature inside the vessel is close to the temperature of the heat medium. This means that the moisture in the material has basically evaporated, the stirring resistance tends to stabilize, and the heat is no longer used for a large amount of latent heat of vaporization. Therefore, it is judged that the material has reached the state where salt can be extracted. At this point, the control module issues a command to start the salt discharge process, that is, to open the electric salt discharge valve while keeping the stirring paddle rotating to help the salt mud be discharged. If Z is not less than Z0, then continue the evaporation and drying process; At this point, the control module couples the two key parameters of current and temperature into a comprehensive environmental coefficient. Salt discharge is only triggered when both are close to the target value, which effectively avoids premature or late salt discharge caused by misjudgment of a single parameter, improves monitoring accuracy, and enables the skid-mounted equipment to operate reliably under unattended conditions.

[0019] During the implementation of the above-mentioned solution, the inventors discovered that because the skid-mounted equipment adopts a modular and movable design, its base is usually only temporarily fixed to the ground by rubber pads or pressure plates, which is less rigid compared to equipment fixed by on-site casting. After transportation and repositioning, the alignment accuracy between the stirring shaft and the vessel body may decrease, and additional vibrations may occur during operation. These vibrations are transmitted to the drive motor through the bearings, causing the motor current to fluctuate regardless of the material viscosity, thereby interfering with the calculation of the comprehensive environmental coefficient. Especially when the material is in a low-viscosity liquid stage, the current signal, which should be stable, will fluctuate irregularly due to vibration, which may lead to abnormal increases or decreases in the Z value, misleading the salt discharge judgment. To this end, the sensing module also includes a vibration sensor, which is used to collect the current vibration and upload it to the control module. The control module calculates the comprehensive environmental coefficient based on the vibration correction current data. Specifically, the control module calculates the comprehensive environmental coefficient Z based on the vibration correction current data Ix, where Ix = Ik × V, where k is the correction coefficient, V is the vibration intensity, where I is the original current measured by the current sensor, V is the effective value of the vibration intensity measured by the vibration sensor, and k is the pre-calibrated correction coefficient. The calibration method for k is as follows: When the equipment is first installed and the reactor is unloaded, start the agitator to the rated speed and record the original current Iy and vibration intensity V0. Theoretically, the unloaded current "Itheoretical Unload" should be a constant value, which is the unloaded current in the motor's factory parameters. The actual measured fluctuation is entirely caused by vibration. Therefore, k = (Iy - Itheoretical Unload) / V0 can be calculated. After calibration, the k value is stored in the control module. During normal production, the control module calculates Ix in real time and uses Ix to replace the original current I in the subsequent comprehensive environmental coefficient calculation. After vibration compensation, the correction current Ix partly eliminates the interference caused by vibration, so that the current signal truly reflects the change in material viscosity. By using vibration sensors to collect current vibration data and then calculating the comprehensive environmental coefficient based on the vibration-corrected current data, the accuracy of monitoring is improved when the vibration of skid-mounted equipment may affect the accuracy of current data collection due to the possibility of it being unable to be securely installed.

[0020] Even with vibration compensation, the corrected current Ix is still affected by random fluctuations within the material, such as fluid turbulence, particle collisions, and occasional blade scraping against the vessel wall. These events cause brief spikes or troughs in Ix, resulting in random fluctuations in the comprehensive environmental coefficient Z calculated based on the instantaneous value. When the material approaches the drying endpoint, the Z value may fluctuate around the threshold, causing frequent or delayed triggering of the salt discharge command. Although the data can be smoothed by extending the filtering time, excessively long filtering will reduce the system's response speed to changes in the actual state. Therefore, it is necessary to effectively suppress random noise while maintaining real-time performance. Therefore, the control module is used to statistically analyze the cumulative value of the correction current over a period of time and determine whether the cumulative value of the current exceeds the standard cumulative value. When the control module determines that the cumulative value exceeds the standard cumulative value, it uses the cumulative value and the standard cumulative value to correct the comprehensive environmental coefficient Z. Specifically, after obtaining the corrected current data Ix, the control module derives the function F(t) of the corrected current data changing over time, and calculates the cumulative value J of the corrected current over a period of time. The control module then determines whether Z×A1 is less than Z0, and if the result is yes, it instructs the salt discharge process to start, where J = A1 = 1 + [(J / J0 - 1) × d)], where t0 is the pre-inputted statistical time period length, d is the pre-inputted correction coefficient, and J0 is the pre-inputted standard cumulative value; When the calculation result shows A1 < 0.8, the control module sets A1 = 0.8; when the calculation result shows A1 > 1.2, the control module sets A1 = 1.2. In this case, 0.8 ≤ A1 ≤ 1.2, to avoid over-correction. Since the integral mean of random noise approaches zero, J can accurately reflect the trend characteristics of material viscosity changes. When A1 is greater than 1, the motor has greater resistance and a larger current, which means that the material viscosity is higher, the dryness is lower, and the time point for salt discharge is longer. Therefore, the value of Z is corrected upward at this time, so that Z is less likely to be less than Z0, reducing the probability of salt discharge being triggered by noise. When A1 is less than 1, the motor overcomes less resistance and the current is smaller, which means that the material viscosity is lower, the degree of dryness is higher, and the time point for salt discharge is closer or salt discharge can be achieved. Therefore, the value of Z is corrected downward at this time, so that the probability of Z being less than Z0 increases and it is easier to be less than Z0, reducing the probability of not being able to trigger salt discharge due to noise. By using the cumulative value, which is less affected by random numerical fluctuations, to correct the comprehensive environmental coefficient, when the comprehensive environmental coefficient is calculated using real-time current and is greatly affected by random data fluctuations, the characteristic that the integral mean of random noise approaches zero and the integral value can reflect the trend is used to correct the comprehensive environmental coefficient, making the comprehensive environmental coefficient more representative of the environment inside the reactor. Meanwhile, compared to the scheme that simply uses integral values ​​for calculation, which has low representativeness of the current situation and is affected by data from the past period, resulting in insufficient immediacy, the scheme that uses integral values ​​to correct the comprehensive environmental coefficient calculated based on real-time values ​​balances the agility of real-time values ​​and the anti-interference capability of integral values.

[0021] To facilitate operator adjustments to equipment parameters under varying operating conditions, this equipment is also equipped with a control panel. The control panel is a touchscreen or LCD screen with buttons, electrically connected to the control module. The control panel displays real-time values ​​for vibration intensity V, corrected current Ix, and comprehensive environmental coefficient Z, as well as information such as the current operating stage, reactor temperature, and vacuum level. Operators can input parameters such as correction coefficient c, heat medium temperature T0, preset current I0, vibration correction coefficient k, integral correction coefficient d, statistical time period length t0, and comprehensive environmental coefficient threshold Z0 through the control panel. For high-salinity wastewater of different concentrations and compositions, operators can adjust these parameters appropriately based on pilot-scale or intermediate-scale test results to achieve optimal equipment performance. The control panel also supports a remote communication interface, allowing operational data to be uploaded to a central monitoring room or cloud platform for remote monitoring and diagnostics.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A skid-mounted device integrating evaporation, drying, and salt extraction, characterized in that: It includes a device body, a sensing module, and a control module, wherein the control module is electrically connected to the sensing module; The equipment body includes a reaction vessel for holding wastewater. The reaction vessel is equipped with a stirring paddle, which is equipped with a heat exchange module. The stirring paddle is driven to rotate by a drive motor. The sensing module includes a current sensor and a temperature sensor. The current sensor is used to monitor the current of the drive motor and upload it to the control module. The temperature sensor is used to monitor the temperature inside the reactor and upload it to the control module. The control module calculates a comprehensive environmental coefficient based on the difference between the motor current and the preset current, and the difference between the temperature inside the reactor and the temperature of the heat medium. When the control module determines that the comprehensive environmental coefficient meets the conditions, it instructs the salt discharge process to start.

2. The skid-mounted equipment integrating evaporation, drying, and salt extraction as described in claim 1, characterized in that: The control module calculates the comprehensive environmental coefficient Z based on the current data I and the temperature data T. The control module determines whether Z is less than Z0, and if the determination result is yes, it instructs the salt discharge process to start. Z = [(|I-I0| / I0) + (|T-T0| / T0)] × c, where I0 is the preset current, T0 is the preset heat medium temperature, and c is the preset correction coefficient.

3. The skid-mounted equipment integrating evaporation, drying, and salt extraction as described in claim 2, characterized in that: The sensing module also includes a vibration sensor, which is used to collect the current vibration and upload it to the control module. The control module calculates the comprehensive environmental coefficient based on the vibration correction current data.

4. The skid-mounted equipment integrating evaporation, drying, and salt extraction as described in claim 3, characterized in that: The control module calculates the comprehensive environmental coefficient Z based on the vibration correction current data Ix, where Ix = Ik × V, and k is the correction coefficient and V is the vibration intensity.

5. A skid-mounted device integrating evaporation, drying, and salt extraction as described in claim 4, characterized in that: The control module is used to statistically analyze the cumulative value of the correction current over a period of time and determine whether the cumulative value of the current exceeds the standard cumulative value. When the control module determines that the cumulative value exceeds the standard cumulative value, it uses the cumulative value and the standard cumulative value to correct the comprehensive environmental coefficient Z.

6. A skid-mounted device integrating evaporation, drying, and salt extraction as described in claim 5, characterized in that: After obtaining the corrected current data Ix, the control module derives the function F(t) of the corrected current data changing over time and calculates the cumulative value J of the corrected current over a period of time. The control module then determines whether Z×A1 is less than Z0, and if the determination result is yes, it instructs the salt discharge process to start, where J= A1 = 1 + [(J / J0 - 1) × d)], where t0 is the pre-inputted statistical time period length, d is the pre-inputted correction coefficient, J0 is the pre-inputted standard cumulative value, and 0.8 ≤ A1 ≤ 1.

2. When the calculation result shows A1 < 0.8, the control module sets A1 = 0.8; when the calculation result shows A1 > 1.2, the control module sets A1 = 1.

2.

7. A skid-mounted device integrating evaporation, drying, and salt extraction as described in claim 6, characterized in that: It also includes a control panel, which is electrically connected to the control module. The control panel is used to display the values ​​of V, Ix, and Z, and to input the values ​​of c, T0, I0, and k.

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