Online salt mud removing system and method for calcium sulfate type brine raw brine barrel

Abstract

The invention discloses an on-line salt mud removing system and method for a calcium sulfate type brine raw brine barrel, and belongs to the technical field of heat pump salt manufacturing, the system comprises a salt mud discharge pipeline and a salt mud removing passage communicated with the salt mud discharge pipeline; the salty mud discharge pipeline is provided with a sludge pump and a blow-down valve; the tail end of the desalted mud passage is arranged in the original brine barrel; the salt mud removal passage is communicated with an auxiliary cleaning passage, a dredging water pump is mounted on the auxiliary cleaning passage, and the auxiliary cleaning passage is provided with a saturated brine input end for providing saturated brine to the tail end of the salt mud removal passage and a salt making condensate water input end for providing cleaning water to the salt mud removal passage and the salt mud discharge pipeline. According to the system and the method, the defects of a manual cleaning mode are thoroughly overcome, the automation level, the operation safety, the production efficiency and the environment-friendly performance of cleaning operation are remarkably improved, and an efficient, stable and environment-friendly salty mud cleaning solution is provided for calcium sulfate type brine heat pump salt manufacturing enterprises.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump salt production, and in particular relates to an online desalting mud system and method for a calcium sulfate type brine raw brine barrel. Background Art

[0002] In the well salt production industry, salt producers using a non-purified calcium sulfate brine heat pump salt production process do not require purification. Instead, caustic soda solution is added directly to the raw brine drum, and the brine's pH is adjusted to a weakly alkaline state before being fed into the salt production unit. The entire salt production process proceeds through a series of steps: gypsum seeding for scale prevention, MVR heat pump evaporation, and mother liquor gypsum treatment. Because calcium sulfate brine contains small amounts of impurities such as calcium, magnesium, and sulfate ions, these impurities inevitably react with the caustic soda during pH adjustment, forming salt sludge that gradually settles at the bottom of the raw brine drum. Over time, the accumulation of salt sludge at the bottom increases, reducing the effective volume of the raw brine drum. This not only reduces the brine's storage and processing capacity but also increases the risk of salt sludge impurities being carried over into the brine during discharge, impacting the stability of the subsequent salt production process. In order to avoid the above problems, the salt mud at the bottom of the original brine barrel needs to be cleaned regularly. The general cleaning cycle is about 6 months to ensure the normal operation of the original brine barrel and the stability of brine quality.

[0003] Currently, the removal of salt sludge from the bottom of raw brine barrels is primarily done manually offline, a method with numerous problems and shortcomings. First, this cleaning method significantly impacts the continuity of salt production. Before cleaning, the target raw brine barrel must be isolated from the salt production system and the brine must be completely drained. During this period, the barrel cannot be used normally, directly reducing the effective production time of the salt production system. Furthermore, the salt sludge cleaning cycle is long, typically taking approximately 15 days to complete. This further impacts the long-term stable operation of the system and reduces production efficiency. Second, manual cleaning is labor-intensive and poses a harsh working environment. Cleaning requires personnel to enter the raw brine barrel, which poses potential safety hazards due to the long-term accumulation of salt sludge, the humid and hot environment, and the low oxygen content. Furthermore, the thick, gelatinous or slurry-like layer of salt sludge makes cleaning difficult, requiring a significant amount of manpower and increasing the workload of operators. Furthermore, this method has a significant environmental impact. Approximately 600 tons of salt sludge are cleaned at a time, and this salt sludge inevitably scatters during the cleaning process, polluting the surrounding environment of the raw brine barrel and potentially affecting the normal operation of surrounding equipment. In addition, if the salt mud cleared out is not disposed of promptly and properly, it may further cause secondary pollution and increase the cost of environmental protection management.

[0004] In summary, the manual offline cleaning method has many shortcomings, such as low production efficiency, high labor intensity, high safety hazards and prominent environmental problems. Therefore, it is urgent to adopt a more efficient, automated and environmentally friendly online cleaning solution to reduce interference with the salt production process, improve the stability of system operation, and reduce the risk of environmental pollution. Summary of the Invention

[0005] In view of the problems of low production efficiency, high labor intensity, high safety hazards and prominent environmental issues in the current process of cleaning salt mud at the bottom of raw brine barrels, the present invention provides an online salt mud removal system and method for calcium sulfate brine raw brine barrels.

[0006] The present invention is achieved as follows: an online desalting mud system for a calcium sulfate brine barrel, characterized in that it includes a salt mud discharge pipeline and a desalting mud passage connected to the salt mud discharge pipeline; the salt mud discharge pipeline is equipped with a sludge pump and a sewage valve; the end of the desalting mud passage is placed in the raw brine barrel; the desalting mud passage is connected to an auxiliary cleaning passage, the auxiliary cleaning passage is equipped with a dredging water pump, and the auxiliary cleaning passage is provided with a saturated brine input end for providing saturated brine to the end of the desalting mud passage and a salt-making condensed water input end for providing cleaning water to the desalting mud passage and the salt mud discharge pipeline.

[0007] In the above technical solution, preferably, the drain valve is located between the desalted mud passage and the sludge pump, and the desalted mud passage transfers the salt mud in the raw brine barrel to the salt mud discharge pipeline through the end.

[0008] In the above technical solution, preferably, the desalted mud passage is installed with a second valve and a first valve in series from the end along the conveying direction of the salt mud to control the on-off of the desalted mud passage, and the desalted mud passage is divided into a first pipe section located between the second valve and the end, a second pipe section located between the second valve and the first valve, and a third pipe section located between the first valve and the drain valve.

[0009] In the above technical solution, preferably, the auxiliary cleaning passage includes a cleaning main section and a first cleaning branch section and a second cleaning branch section connected to the cleaning main section; the cleaning main section is installed with a dredging water pump and a flow meter in series, and the cleaning main section is provided with a saturated brine input end and a salt-making condensed water input end; the first cleaning branch section connects the cleaning main section and the first pipe section and is installed with a third valve for controlling the on-off of the first cleaning branch section; the second cleaning branch section connects the cleaning main section and the second pipe section and is installed with a fourth valve for controlling the on-off of the second cleaning branch section.

[0010] In the above technical solution, preferably, a brine input valve is installed at the brine input end of the auxiliary cleaning passage, and a salt-making condensed water input valve is installed at the salt-making condensed water input end of the auxiliary cleaning passage.

[0011] In the above technical solution, preferably, the desilting mud passage and the auxiliary cleaning passage connected thereto form a group of desilting and cleaning units, and the salt mud discharge pipeline is connected to N groups of the desilting and cleaning units.

[0012] In the above technical solution, preferably, the end of the desalting mud passage of the desludging and cleaning unit is arranged close to the bottom of the original brine barrel and is evenly distributed in the circumferential direction.

[0013] The second object of the present invention is to provide a method for online desalting mud from a calcium sulfate brine barrel based on the above-mentioned online desalting mud system, which is characterized by comprising the following steps:

[0014] S1. The original brine barrel discharge sludge: The salt sludge in the original brine barrel is discharged through the salt sludge discharge pipe and the desalting mud passage, and the first cleaning branch section of the desalting mud passage is connected to the first section of the desalting mud passage to inject saturated brine;

[0015] S2. Cleaning of flow components: Use the auxiliary cleaning passage to inject condensed water for cleaning the desalting mud passage into the desalting mud passage connected to it, and discharge the cleaned condensed water from the drain valve.

[0016] In the above technical solution, preferably, in step S2, cleaning the flow-through component includes the following steps:

[0017] S2.1. Confirm that all valves are initially closed. First, open the salt condensate water inlet valve, start the dredging pump, and open the third valve to clean the first section of the desalination sludge pipeline.

[0018] S2.2. Close the third valve and open the second and fourth valves to clean the first pipe section, the second pipe section, and the second valve of the desalted mud passage;

[0019] S2.3. Close the second valve and open the first valve and the drain valve to clean the second pipe section, the third pipe section, the first valve and the drain valve of the desalted mud passage;

[0020] S2.4. Finally, close the first valve, the fourth valve, and the drain valve to confirm that the entire pipe section of the target desalination mud channel has been cleaned.

[0021] The calcium sulfate brine raw brine barrel online desalination mud system and method has the following advantages and significant effects:

[0022] First, the system achieves automated, online salt sludge removal without human intervention, avoiding the labor-intensive and harsh working environment of raw brine barrels, significantly improving operational safety. Second, by employing a non-stop, non-emptying brine barrel cleaning method, salt sludge cleaning can be completed simultaneously with normal operation of the brine barrels, preventing the impact of cleaning operations on the barrels. This effectively improves production continuity within the salt production system and avoids the time and resource waste associated with brine emptying. Furthermore, the system's cleaning process is efficient and stable. Compared to traditional manual cleaning, which takes 15 days, this method can complete salt sludge removal in a shorter time, significantly shortening the cleaning cycle and improving the efficiency of raw brine barrels. Furthermore, the system utilizes a remotely controlled DCS system, enabling precise control of the entire cleaning process by controlling on-site equipment and instrumentation valves. This reduces human error and enhances the intelligence and automation of the cleaning process. Finally, the system reduces environmental pollution by optimizing the salt sludge discharge method. During the cleaning process, the salt sludge is directly transferred to the salt sludge treatment system, avoiding the environmental pollution caused by spillage and scattering during traditional manual cleaning processes. This method also minimizes the impact on surrounding equipment and the work area, improving environmental performance.

[0023] In summary, the online desalination mud system and method provided by the present invention not only completely overcome the disadvantages of manual cleaning methods, but also significantly improve the automation level, operation safety, production efficiency and environmental protection performance of the cleaning operation, providing calcium sulfate brine heat pump salt production enterprises with an efficient, stable and environmentally friendly salt mud cleaning solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing the relationship between the locations of the salt mud discharge pipes in the present invention;

[0025] Figure 2 It is a schematic flow diagram of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] To address the current issues of low production efficiency, high labor intensity, high safety risks, and prominent environmental issues in the process of cleaning the bottom of raw brine barrels, the present invention provides an online desalting system and method for raw brine barrels containing calcium sulfate brine. To further illustrate the structure of the present invention, a detailed description is provided below with reference to the accompanying drawings:

[0028] Example 1

[0029] See also Figure 1 and Figure 2An online desalting system for calcium sulfate brine barrels includes a desalting mud discharge pipeline 1 and a desalting mud passage 2 connected to the desalting mud discharge pipeline. The desalting mud passage extends into the raw brine barrel to remove the salt mud from the barrel. The desalting mud discharge pipeline connects to the desalting mud passage and transports the removed salt mud to the salt mud treatment system. The desalting mud discharge pipeline and the desalting mud passage constitute the salt mud discharge conduit.

[0030] The salt sludge discharge pipeline is equipped with a sludge pump and a blowdown valve. The blowdown valve is located between the desalted sludge passage and the sludge pump. That is, the liquid discharged from the desalted sludge passage first passes through the blowdown valve and then passes through the sludge pump. The function of the sludge pump is to provide power for the transportation and discharge of salt sludge.

[0031] The end of the desalting mud passage is placed inside the brine barrel. This terminal serves as the final port of the pipeline and the opening for extracting the brine slurry. The desalting mud passage transfers the brine slurry from the brine barrel to the brine slurry discharge pipeline. To ensure effective brine slurry removal, the end of the desalting mud passage is located near the bottom of the brine barrel.

[0032] A second valve 3 and a first valve 4 are installed in series along the desalted mud passageway, starting from the end and conveying the salt mud. These valves divide the desalted mud passageway into a first pipe section between the second valve and the end, a second pipe section between the second valve and the first valve, and a third pipe section between the first valve and the drain valve. The third pipe section is not limited to the desalted mud passageway itself but also includes the salt mud discharge pipeline.

[0033] The desalted mud passage connects to the auxiliary cleaning passage 5, which is equipped with a dredging pump. This auxiliary cleaning passage has the functions of cleaning and supplying saturated brine. The auxiliary cleaning passage has a saturated brine input port, which supplies saturated brine to the end of the desalted mud passage, and a salt production condensate input port, which provides cleaning water to the desalted mud passage and the salt mud discharge pipeline. The saturated brine input port is connected to the saturated brine supply device, and the cleaning condensate input port is connected to the salt production condensate supply device.

[0034] The auxiliary cleaning passageway includes a main cleaning section and first and second branch cleaning sections connected to the main cleaning section. Specifically, the first and second branch cleaning sections are connected in parallel to the main cleaning section, forming two branches leading to the desalted mud passageway. A dredging pump and flowmeter are installed in series with the main cleaning section. The saturated brine input and the cleaning condensate input are connected in parallel at the front end of the main cleaning section, flowing into the dredging pump and flowmeter. The first branch cleaning section connects the main cleaning section and the first pipe section and is equipped with a third valve 6 for controlling the flow of the first branch cleaning section. The second branch cleaning section connects the main cleaning section and the second pipe section and is equipped with a fourth valve 7 for controlling the flow of the second branch cleaning section. A brine input valve is installed at the brine input of the auxiliary cleaning passageway, and a salt production condensate input valve is installed at the condensate input of the auxiliary cleaning passageway.

[0035] The desalting mud passage and the auxiliary cleaning passage connected thereto form a group of desilting and cleaning units, and the salt mud discharge pipeline is connected to N groups of desilting and cleaning units. The ends of the desalting mud passages of the desilting and cleaning units are evenly distributed in the circumference. In this embodiment, specifically, the diameter of the original brine barrel is 18 meters, and the ends of the 6 groups of desilting and cleaning units, that is, the salt mud inlets are evenly distributed on a circumference with a diameter of 6 meters. S1, S2, S3, S4, S5, and S6, which are 2 meters from the inlet along the direction of the desalting mud passage, are the access points for the first cleaning branch pipe section to connect to the first pipe section. The salt mud discharge pipeline is connected to six groups of desilting and cleaning units, which are N1-N6 in sequence. The first valve in the six groups of desilting and cleaning units is K N1-1 , K N2-1 , K N3-1 , K N4-1 , K N5-1 , K N6-1 ; The second valve is K N1-2 , K N2-2 , K N3-2 , K N4-2 , K N5-2 , K N6-2 ; The third valve is K S1-1 , K S2-1 , K S3-1 , K S4-1 , K S5-1 , K S6-1 ; The fourth valve is K S1-2 , K S2-2 , K S3-2 , K S4-2 , K S5-2 , K S6-2 The drain valve of the desalination mud channel is K0; the brine input valve is K S2 , the salt making condensate water input valve is K S1 The above valves are all pneumatic valves.

[0036] Example 2

[0037] A method for online desalting mud from a calcium sulfate brine barrel based on the above-mentioned online desalting mud system is characterized by comprising the following steps:

[0038] Discharge of sludge from the original brine barrel: discharge the salt sludge in the original brine barrel through the passage composed of the salt sludge discharge pipeline and the desalted mud passage, and at the same time use the first cleaning branch section of the desalted mud passage to inject saturated brine into the first pipe section of the desalted mud passage connected to it.

[0039] In this embodiment, specifically, the desalination cycle of the original brine barrel in this embodiment is once a month. The desalination process is all online and there is no need to empty the original brine barrel. That is, during the normal online operation of the original brine barrel filled with brine, the sludge pump P is used. NThe brine mud and its associated pipes and valves are used to discharge the brine mud at the bottom of the original brine barrel to the brine mud treatment system. In the process of discharging the brine mud, in order to prevent the brine mud from being discharged smoothly due to the high concentration of the mud, the present invention is designed to use a dredging pump P S The saturated brine is injected into the brine sludge discharge pipe at S1, S2, S3, S4, S5, and S6, and mixed with the brine slurry in the pipe to reduce the concentration of the brine sludge and improve its fluidity. The main reason for injecting saturated brine into the brine sludge discharge pipe instead of condensate is to avoid the long-term injection of condensate affecting the concentration of brine in the original brine barrel.

[0040] Before the online desalination mud design of the present invention is implemented, it should be confirmed that the original brine barrel is in a high liquid level state and the attached Figure 2 All valves are initially closed. First, open the pneumatic valve K. S2 , start the dredge pump PS (Rated flow rate is 15m 3 / h, lift is 80m), then open the pneumatic valve K S1-1 , K S2-1 , K S3-1 , K S4-1 , K S5-1 and K S6-1 , then open the pneumatic valve K in sequence N1-2 , K N1-1 , K N2-2 , K N2-1 , K N3-2 , K N3-1 , K N4-2 , K N4-1 , K N5-2 , K N5-1 and K N6-2 , K N6-1 , finally turn on the sludge pump P N (Rated flow rate is 200m 3 / h, lift 25m), sludge pump P N Run continuously for about 90 minutes, wait for the sludge pump P N When the discharged liquid no longer has visible mud residue and gradually changes from turbid slurry to clear brine, it means that the online desalination of the original brine barrel is completed. N , then close the pneumatic valve K in turn N1-2 , K N1-1 , K N2-2 , K N2-1 , K N3-2 , K N3-1 , K N4-2 , K N4-1 , K N5-2 , K N5-1 and K N6-2 , KN6-1 , then close the pneumatic valve K in sequence S1-1 , K S2-1 , K S3-1 , K S4-1 , K S5-1 and K S6-1 , finally stop unclogging the water pump P S And close the pneumatic valve K S2 .

[0041] Cleaning of flow-through components: Use the auxiliary cleaning passage to inject condensed water used to clean the desalting mud passage connected to it, and discharge the cleaned condensed water from the drain valve.

[0042] In this step, first confirm that all valves are initially closed, open the salt condensate water input valve and the third valve, and start the dredging pump to clean the first pipe section of the desalting mud passage;

[0043] Afterwards, the third valve is closed and the second valve and the fourth valve are opened to clean the first pipe section, the second pipe section and the second valve of the desalted mud passage;

[0044] Then, the second valve is closed and the first valve and the drain valve are opened to clean the second pipe section, the third pipe section, the first valve and the drain valve of the desalted mud passage;

[0045] Finally, the first valve, the fourth valve and the drain valve are closed, indicating that the cleaning of the entire target desalination mud passage is completed.

[0046] Using a segmented cleaning method, only a portion of the pipe is opened for flushing at a time, allowing the water flow to be concentrated on the target cleaning area, thereby improving the cleaning effect. This avoids the dispersion of flushing water and the formation of localized cleaning dead spots caused by flushing the entire pipe section at the same time, ensuring that salt mud and solid attachments inside the pipe are completely removed. The cleaning process is gradually promoted, so that the flushing water can be efficiently used in each section in turn.

[0047] In this embodiment, specifically, the dredging pump P is used S The salt condensate and its associated pipes and valves are used to inject the salt sludge discharge pipe, and the high-pressure condensate is used to flush and clear the solid attachments on the flow components of the salt sludge discharge pipe, providing a smooth channel for the discharge of salt sludge. Before clearing the pipe, confirm that the attached Figure 2 All valves are initially closed, open the pneumatic valve K S1 , start the dredging pump P S (Rated flow rate is 15m 3 / h, lift is 80m).

[0048] The dredging process of the salt mud discharge pipe N1: First open the pneumatic valve K S1-1, pay attention to the reading of flow meter F and confirm that the flow rate is greater than 10m 3 When the continuous flow of air at 1 / h lasts for about 1 minute, close the pneumatic valve K. S1-1 Then open the pneumatic valve K in turn. N1-2 and pneumatic valve K S1-2 , pay attention to the reading of flow meter F and confirm that the flow rate is greater than 10m 3 When the continuous flow of air at 1 / h lasts for about 1 minute, close the pneumatic valve K. N1-2 , open the pneumatic valve K N1-1 And pneumatic drain valve K0, pay attention to the flow meter F reading, confirm that the flow rate is greater than 10m 3 When the continuous flow of air at 1 / h lasts for about 1 minute, close the pneumatic valve K. N1-1 , pneumatic drain valve K0 and pneumatic valve K S1-2 , so the dredging of salt mud discharge pipe N1 is completed. According to the dredging process of salt mud discharge pipe N1, dredge salt mud discharge pipes N2, N3, N4, N5, and N6 in turn. Finally, stop dredging water pump P S And close the pneumatic valve K S1 .

[0049] The valves, dredging pumps and sludge pumps in the above method can be manually controlled according to actual working conditions and needs. In addition, an adaptive automation control system can be equipped with existing automatic control technology.

[0050] In order to realize the automatic control of the online desalination mud system, an optional control system is given in this embodiment. The system mainly consists of PLC (Programmable Logic Controller), HMI (Human Machine Interface), sensors, actuators (pneumatic valves, solenoid valves, variable frequency water pumps) and industrial network. PLC is the core control unit responsible for automatically executing the desalination mud and pipeline cleaning process, including the mud pump P N , dredge the water pump P S The system controls the sequence of each pneumatic valve, monitors key parameters, and provides fault alarm functions. The HMI is used to display the system operating status, allowing operators to set parameters such as mud discharge time, flow threshold, cleaning time, etc., and provides manual / automatic switching function.

[0051] In terms of automated monitoring, the system is equipped with a variety of sensors to achieve closed-loop control. The liquid level sensor is installed in the raw brine tank to ensure that the desalination process is started only after the raw brine tank is at a high liquid level. The flow meter (F) is used to monitor the flow of the dredging pump P. S and sludge pump P N flow rate, and ensure that the flow rate is greater than 10m 3The continuous duration of / h meets the process requirements. The pressure sensor is arranged on the salt mud discharge pipeline to monitor the pressure changes in the pipeline to prevent the pipeline from being blocked due to excessive mud concentration. The turbidity sensor is installed at the mud discharge outlet to detect the turbidity of the discharged liquid in real time to ensure that the mud pump P is stopped when the liquid changes from turbid to clear. N , thus completing the sludge discharge process.

[0052] In terms of actuators, the system uses pneumatic valves (KS series, KN series) and variable frequency controlled water pumps to achieve efficient and reliable control. The pneumatic valves are automatically controlled by PLC and open or close in sequence according to the preset sequence to ensure the smooth progress of mud discharge and cleaning processes. The variable frequency controlled water pump is used to adjust the flow and pressure to ensure the smooth operation of the water pump P S Maintain a stable flow rate after startup to optimize pipeline flushing and avoid pipeline vibration or wear caused by excessive instantaneous flow.

[0053] In terms of automatic control logic design, the system is divided into two main modes: "online desalination" and "pipeline cleaning".

[0054] In the online desalination mud mode, the system first confirms that the original brine tank is in a high liquid level state and detects that all related valves are in the initial closed state. Then, the PLC opens the pneumatic valve K in sequence according to the set program. S2 , and start the dredging pump P S , so that the saturated brine enters the salt mud discharge pipeline, and then gradually open the pneumatic valves at all levels until the mud pump P N Start and start to discharge mud. When the flow meter and turbidity sensor detect that the discharged liquid reaches the clarity standard, the PLC automatically stops the mud pump P N , and close all valves in reverse order to finally complete the online desalination operation.

[0055] In the pipeline cleaning mode, the system also first confirms that all valves are initially closed. Then, the PLC controls the pneumatic valves to open in sequence and starts the dredging pump P S , allowing the salt production condensate to enter the desalination mud channel. The cleaning process is carried out in a preset order, starting with cleaning the first pipe section, then gradually extending to the second and third pipe sections until all pipes are flushed. Throughout the process, the flow meter monitors the water flow in real time to ensure that the cleaning process at each stage meets the expected flow standard. After the cleaning is completed, the PLC closes all valves in reverse order and stops the dredging pump P S , ensuring that the entire system returns to standby state.

[0056] Furthermore, the automatic control system integrates data logging and remote monitoring capabilities. The PLC stores and uploads key data such as liquid level, flow, pressure, and turbidity to a monitoring center, enabling remote monitoring and historical data analysis. Through the HMI interface, operators can adjust control parameters at any time to optimize the sludge removal and cleaning processes, improving the stability and intelligence of system operation. Furthermore, the system also features a fault alarm mechanism. If abnormal flow, pressure, or pipe blockage is detected, the system will automatically shut down and issue an alarm, prompting operators to take timely action to prevent equipment damage or production interruption.

[0057] In summary, after being equipped with an automatic control system, the online desalination mud system will achieve fully automated operation, improve the efficiency of desalination mud, reduce manual intervention, and optimize the pipeline cleaning effect, ensuring smooth discharge of salt mud, providing more stable and reliable protection for the entire brine treatment process.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An online desalination system for calcium sulfate brine barrels, characterized by: It includes a salt mud discharge pipeline and a desalted mud passage connected to the salt mud discharge pipeline; the salt mud discharge pipeline is equipped with a sludge pump and a sewage valve; the end of the desalted mud passage is placed in the original brine barrel; the desalted mud passage is connected to the auxiliary cleaning passage, the auxiliary cleaning passage is equipped with a dredging water pump, and the auxiliary cleaning passage is provided with a saturated brine input end for providing saturated brine to the end of the desalted mud passage and the salt making condensed water input end for providing cleaning water to the desalted mud passage and the salt mud discharge pipeline.

2. The calcium sulfate brine raw brine barrel online desalination mud system according to claim 1, characterized in that: The drain valve is located between the desalted mud passage and the sludge pump. The desalted mud passage transfers the salt slurry in the original brine barrel to the salt mud discharge pipeline through the end.

3. The calcium sulfate brine raw brine barrel online desalination mud system according to claim 2 is characterized by: The desalted mud passage is installed in series with a second valve and a first valve for controlling the on-off of the desalted mud passage from the end along the conveying direction of the salt mud, and the desalted mud passage is divided into a first pipe section located between the second valve and the end, a second pipe section located between the second valve and the first valve, and a third pipe section located between the first valve and the drain valve.

4. The calcium sulfate brine raw brine barrel online desalination mud system according to claim 3 is characterized by: The auxiliary cleaning passage includes a cleaning main section and a first cleaning branch section and a second cleaning branch section connected to the cleaning main section; the cleaning main section is installed with a dredging water pump and a flow meter in series, and the cleaning main section is provided with a saturated brine input end and a salt-making condensed water input end; the first cleaning branch section connects the cleaning main section and the first pipe section and is installed with a third valve for controlling the on-off of the first cleaning branch section; the second cleaning branch section connects the cleaning main section and the second pipe section and is installed with a fourth valve for controlling the on-off of the second cleaning branch section.

5. The calcium sulfate brine raw brine barrel online desalination mud system according to claim 4 is characterized in that: A brine input valve is installed at the brine input end of the auxiliary cleaning passage, and a salt-making condensed water input valve is installed at the salt-making condensed water input end of the auxiliary cleaning passage.

6. The calcium sulfate brine raw brine barrel online desalination mud system according to claim 5, characterized in that: The desalting mud passage and the auxiliary cleaning passage connected thereto form a group of desilting and cleaning units, and the salt mud discharge pipeline is connected to N groups of the desilting and cleaning units.

7. The calcium sulfate brine raw brine barrel online desalination mud system according to claim 6, characterized in that: The end of the desalting mud passage of the desilting and cleaning unit is arranged close to the bottom of the original brine barrel and is evenly distributed in the circumferential direction.

8. A method for online desalting mud using a calcium sulfate brine barrel based on the online desalting mud system according to claim 7, characterized in that: The following steps are involved: S1. The original brine barrel discharge sludge: The salt sludge in the original brine barrel is discharged through the salt sludge discharge pipe and the desalting mud passage, and the first cleaning branch section of the desalting mud passage is connected to the first section of the desalting mud passage to inject saturated brine; S2. Cleaning of flow components: Use the auxiliary cleaning passage to inject condensed water for cleaning the desalting mud passage into the desalting mud passage connected to it, and discharge the cleaned condensed water from the drain valve.

9. The online desalination mud method for calcium sulfate brine barrels of the online desalination mud system according to claim 8, characterized in that: In step S2, cleaning the flow-through component includes the following steps: S2.

1. Confirm that all valves are initially closed. First, open the salt condensate water inlet valve, start the dredging pump, and open the third valve to clean the first section of the desalination sludge pipeline. S2.

2. Close the third valve and open the second and fourth valves to clean the first pipe section, the second pipe section, and the second valve of the desalted mud passage; S2.

3. Close the second valve and open the first valve and the drain valve to clean the second pipe section, the third pipe section, the first valve and the drain valve of the desalted mud passage; S2.

4. Finally, close the first valve, the fourth valve, and the drain valve to confirm that the entire pipe section of the target desalination mud channel has been cleaned.

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