Automatic urea solution delivery method and system

Abstract

The application discloses an automatic urea solution conveying method and system, relates to the field of urea solution preparation, obtains a past urea solution conveying process and equipment operation log, analyzes the past urea solution conveying process and equipment operation log, determines past urea solution concentration requirements, past urea solution density requirements and past temperature requirements, respectively establishes past demand curves according to the above requirements, aligns the past demand curves to generate a past urea solution conveying reference model, performs initial solution preparation according to current comparison factors, determines a urea solution conveying model, judges the urea solution, performs solution conveying if the urea solution is qualified, performs solution preparation again if the urea solution is unqualified, obtains urea solution storage tank liquid level detection data, determines the linkage relationship between an electric valve state and a urea solution tank, obtains environmental ammonia concentration and pipeline crystallization degree, adjusts the urea solution automatic conveying environment, and performs safety monitoring and safety early warning on the equipment operation process.

Description

Technical Field

[0001] This invention relates to the field of urea solution preparation technology, and in particular to an automatic method and system for conveying urea solution. Background Technology

[0002] In recent years, urea-to-ammonia systems have rapidly matured and developed. These systems are widely used due to their advantages such as safety, stability, low energy consumption, and high utilization rate. The system prepares a 50% urea solution through a hydrolysis reaction under specific pressure and temperature, separating and outputting the finished ammonia gas, which replaces the ammonia gas generated from liquid ammonia and enters the SCR zone.

[0003] The urea-to-ammonia project mainly includes several key components such as urea solution preparation and storage, steam desuperheating and depressurization, urea solution transportation, hydrolysis reaction, and finished product transportation. Automated urea solution transportation is a method used in industrial production that can transport urea solution from one location to another. This method can improve efficiency, reduce manual intervention, and lower the error rate.

[0004] In the urea-to-ammonia system, especially in the urea solution preparation stage, the dissolution of urea particles requires manual feeding and preparation. Incomplete dissolution of urea particles, uncontrollable urea solution preparation volume, and unstable liquid level in the urea dissolution tank all make it difficult to achieve stable and automated system operation. At the same time, the concentration of urea solution is often unqualified, making it difficult to achieve qualified urea solution output. After the urea solution is prepared, urea particles and solution residues can easily cause crystallization and blockage of pipelines.

[0005] In the urea solution transportation stage of a urea-to-ammonia system, the liquid levels in the urea dissolving tank and urea storage tank are key concerns for operators. If the liquid level in the dissolving tank is too low, the urea dissolving pump will run dry, causing equipment damage. If the liquid level in the storage tank is too high, urea may overflow from the top of the tank, resulting in waste. In cases of poor ventilation, this can also lead to ammonia gas accumulation, threatening personal safety. Summary of the Invention

[0006] To address the aforementioned issues, this application provides an automatic urea solution delivery method and system, which aims to achieve one-click delivery of urea solution and includes a liquid level interlock between the storage tank and the dissolving tank in the sequential control program to ensure the safety of the delivery process.

[0007] In some embodiments of this application, a method for automatic delivery of urea solution is provided, including: acquiring past urea solution delivery process and equipment operation logs, analyzing past urea solution delivery process and equipment operation logs, and determining past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements.

[0008] A first-time reference line is established based on the past requirements for urea solution concentration, density, and temperature. Using the first-time reference line as the horizontal variable, curves for past urea solution concentration, density, and temperature are established respectively.

[0009] Align the past urea solution concentration demand curve, past urea solution density demand curve, and past temperature demand curve to generate a past urea solution delivery reference model.

[0010] Based on the current comparison factors, the urea solution was initially prepared and the urea solution delivery model was determined.

[0011] Obtain the evaluation rules for the urea solution currently being prepared, and make a judgment on the urea solution;

[0012] If the urea solution is deemed qualified, a delivery signal is sent to deliver the solution; if the urea solution is deemed unqualified, a solution preparation signal is sent to prepare the solution again.

[0013] Acquire urea solution storage tank level detection data to determine the linkage between the electric valve status and the urea dissolving tank;

[0014] By acquiring ambient ammonia concentration data and pipeline crystallization degree data, the environment for automatic urea solution delivery is adjusted;

[0015] The system monitors the equipment operation process for safety and provides safety warnings for different situations.

[0016] In some embodiments of this application, the method for generating a reference model of past urea solution delivery includes:

[0017] A vertical scan line is established based on the past urea solution concentration demand curve, past urea solution density demand curve, and past temperature demand curve. The intersection points of the vertical scan line with the past urea solution concentration demand curve, past urea solution density demand curve, and past temperature demand curve are respectively identified as the first reference point for past urea solution concentration demand, the first reference point for past urea solution density demand, and the first reference point for past temperature demand.

[0018] Based on the current comparison factors, the position of the vertical scan line is determined, and the determined first reference point for urea solution concentration requirement, first reference point for urea solution density requirement, and first reference point for temperature requirement are combined to generate an initial urea solution delivery reference model.

[0019] In some embodiments of this application, the method for initial preparation of urea solution includes:

[0020] Obtain the current comparison factors and determine the initial urea solution delivery reference model based on the current comparison factors;

[0021] The current urea solution concentration requirement, current urea solution density requirement, and current temperature requirement are determined by the initial urea solution delivery reference model.

[0022] There is a pre-set urea solution ratio table. The amount of urea to be dissolved and the amount of water to be injected are determined according to the correspondence between the current urea solution concentration requirement and the urea solution ratio table.

[0023] A pre-set stirring rule diagram is provided, which determines the number of stirring times and rotation speed according to the current density requirements of the urea solution.

[0024] Adjust the room temperature according to the current temperature requirement and start the equipment.

[0025] In some embodiments of this application, the current method for evaluating the urea solution includes:

[0026] The evaluation of urea solution includes two aspects: the density of the urea solution and the concentration of the urea solution.

[0027] It has a preset urea solution density testing mechanism and a preset acceptable range of urea solution density. The urea solution density is considered acceptable if it remains stable within the acceptable range for a certain period of time.

[0028] The system includes a urea solution concentration detection mechanism and a urea solution concentration range standard table. The urea solution concentration range standard table includes a urea solution concentration range fluctuation standard value. The urea solution concentration detection value meets the urea solution concentration fluctuation range judgment qualification.

[0029] In some embodiments of this application, the method for reconstituted urea solution includes:

[0030] A pre-set water content gradient change table is provided, which includes the water volume and gradient change under several conditions.

[0031] A urea content gradient change table is preset, which includes the amount of urea and gradient change under several conditions;

[0032] If the concentration of the urea solution does not meet the fluctuation range of the urea solution concentration, it is deemed unqualified and the solution must be prepared again.

[0033] When the concentration of the urea solution is below the fluctuation range of the urea solution concentration, the urea solution is gradually increased with stirring until the concentration is appropriate.

[0034] When the concentration of the urea solution is higher than the concentration fluctuation range of the urea solution, the urea solution is gradually injected with water and stirred until the concentration is appropriate.

[0035] In some embodiments of this application, the method for determining the linkage between the electric valve status and the urea dissolving tank includes:

[0036] The system is equipped with a urea storage tank level detection device to detect the current urea storage tank level and obtain the urea storage tank level detection value.

[0037] There is a preset standard range for urea storage tank level. When the detected level of urea storage tank is not within the standard range, a command is sent to close the inlet valve of the urea storage tank, and the urea dissolving pump will automatically stop running.

[0038] In some embodiments of this application, the method for adjusting the automatic delivery environment of urea solution includes:

[0039] Test the ammonia levels in the current environment. If the levels exceed the safe range, adjust the ventilation and temperature to maintain a suitable temperature.

[0040] Urea crystallization is observed in the equipment pipelines. A crystallization status map is preset. The current crystallization status is compared and local temperature adjustments are made.

[0041] In some embodiments of this application, the situations in which security warnings are issued for different circumstances include:

[0042] Safety warnings include low liquid level warnings in the dissolving tank, high liquid level warnings in the dissolving tank, and safety environment warnings.

[0043] The low liquid level warning for the dissolving tank refers to the alarm signaling maintenance when the liquid level in the dissolving tank is consistently below the standard range for a period of time.

[0044] The high liquid level warning for the dissolving tank refers to the alarm being triggered when the liquid level in the dissolving tank is consistently higher than the standard range for a period of time. This alarm is used to remind maintenance personnel and a safety environment warning is also activated to alert staff.

[0045] The aforementioned safety environment early warning involves warning of the ammonia content in the environment, and issuing an early warning to remind staff to evacuate when the ammonia content is too high.

[0046] In some embodiments of this application, an automated urea solution delivery system is disclosed, comprising:

[0047] The information acquisition module acquires the past urea solution delivery process and equipment operation logs, analyzes the past urea solution delivery process and equipment operation logs, and determines the past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements.

[0048] The model building module establishes a first-time reference line for past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements. Using the first-time reference line as the horizontal variable, it establishes past urea solution concentration requirement curves, past urea solution density requirement curves, and past temperature requirement curves respectively. The past urea solution concentration requirement curves, past urea solution density requirement curves, and past temperature requirement curves are aligned to generate a past urea solution delivery reference model.

[0049] The debugging and operation module prepares urea solution based on current comparison factors, determines the urea solution delivery model, obtains the urea solution evaluation rules for the current preparation, and judges the urea solution. If the urea solution is qualified, a delivery signal is sent to deliver the solution; if the urea solution is unqualified, a preparation signal is sent to re-prepare the solution. The module also obtains urea solution storage tank level detection data, determines the linkage between the electric valve status and the urea dissolving tank, obtains ambient ammonia concentration data and pipeline crystallization degree data, and adjusts the automatic urea solution delivery environment.

[0050] The safety early warning module monitors the equipment operation process and issues warnings for different situations.

[0051] This application discloses an automatic urea solution delivery method and system, which has the following advantages in the automatic delivery of urea solution:

[0052] 1. This application provides a method for providing safety warnings in response to different situations. When the liquid level in the dissolving tank is too low or too high, it can effectively prevent the urea dissolving pump from running dry, which could cause equipment damage and urea from overflowing from the top of the storage tank, resulting in waste.

[0053] 2. This application provides a method for adjusting the environment of automatic urea solution delivery, including ventilation adjustment and early warning, to reduce the risk of ammonia accumulation due to poor ventilation, which could threaten personal safety.

[0054] 3. This application provides a method for determining the linkage between the electric valve status and the urea dissolving tank. The urea supply station realizes one-click delivery of urea solution and sets up a liquid level interlock between the storage tank and the dissolving tank to ensure the safety of the delivery process.

[0055] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the system modules of an automatic urea solution delivery method and system according to an embodiment of this application;

[0057] Figure 2 This is a flowchart illustrating the steps of an automatic urea solution delivery method and system as described in this application. Detailed Implementation

[0058] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0059] Example:

[0060] like Figure 1 The purpose of this invention is to provide a method for automatically delivering urea solution.

[0061] Step S1: Obtain the past urea solution delivery process and equipment operation logs, analyze the past urea solution delivery process and equipment operation logs, and determine the past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements.

[0062] It is important to understand that past urea solution delivery processes and equipment operation logs can provide some data, including but not limited to past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements. This method extracts the necessary data to facilitate the construction of a past urea solution delivery reference model.

[0063] Step S2: Establish a first-time reference line based on past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements. Using the first-time reference line as the horizontal variable, establish past urea solution concentration requirement curves, past urea solution density requirement curves, and past temperature requirement curves respectively. Align the past urea solution concentration requirement curves, past urea solution density requirement curves, and past temperature requirement curves to generate a past urea solution delivery reference model.

[0064] The method for generating a reference model for past urea solution delivery includes: establishing a vertical scan line based on the past urea solution concentration demand curve, the past urea solution density demand curve, and the past temperature demand curve; the intersection points of the vertical scan line with the past urea solution concentration demand curve, the past urea solution density demand curve, and the past temperature demand curve are respectively identified as the first reference point for past urea solution concentration demand, the first reference point for past urea solution density demand, and the first reference point for past temperature demand.

[0065] Based on the current comparison factors, the position of the vertical scan line is determined, and the determined first reference point for urea solution concentration requirement, first reference point for urea solution density requirement, and first reference point for temperature requirement are combined to generate an initial urea solution delivery reference model.

[0066] It is important to understand that the vertical scan line corresponds to the current comparison factors, which are comprehensive factors, including but not limited to the requirements for urea solution concentration and urea solution density. The three curves mentioned above correspond to the requirements of social demand on the equipment, and the formation of the reference point constitutes the past urea solution delivery model.

[0067] Step S3: Based on the current comparison factors, prepare the urea solution and determine the urea solution delivery model. Obtain the urea solution evaluation rules for the current preparation and judge the urea solution. If the urea solution is qualified, send a delivery signal to deliver the solution. If the urea solution is unqualified, send a preparation signal to re-prepare the solution. Obtain the urea solution storage tank level detection data, determine the linkage relationship between the electric valve status and the urea dissolving tank, obtain the ambient ammonia concentration data and pipeline crystallization degree data, and adjust the automatic delivery environment of the urea solution.

[0068] It is important to understand that concentration and density are two standards for whether a urea solution is qualified. Urea solutions with qualified concentration and density need to be transported to urea storage tanks for storage.

[0069] The method for initial preparation of urea solution includes: obtaining current comparison factors and determining the initial urea solution delivery reference model based on the current comparison factors.

[0070] The current urea solution concentration requirement, current urea solution density requirement, and current temperature requirement are determined by the initial urea solution delivery reference model.

[0071] A urea solution mixing table is pre-set. The amount of urea to be dissolved and the amount of water to be injected are determined based on the correspondence between the current required urea solution concentration and the urea solution mixing table.

[0072] A pre-set stirring rule diagram is provided, which determines the number of stirring times and the rotation speed according to the current density requirements of the urea solution.

[0073] Adjust the room temperature according to the current temperature requirement and start the equipment.

[0074] It should be understood that the aforementioned comparative factors can be changed or adjusted according to the actual situation.

[0075] Current methods for evaluating urea solutions include two aspects: the density and concentration of the urea solution.

[0076] It has a preset urea solution density testing mechanism and a preset acceptable density range for urea solution. The urea solution is deemed acceptable if its density remains stable within the acceptable density range for a certain period of time.

[0077] The system includes a urea solution concentration detection mechanism and a urea solution concentration range standard table. The urea solution concentration range standard table includes a urea solution concentration range fluctuation standard value. The urea solution concentration detection value meets the urea solution concentration fluctuation range judgment qualification.

[0078] It is important to understand that the density of urea solution and the concentration fluctuation range of urea solution are set separately, meaning that slight errors are allowed and can be refined.

[0079] The method for re-preparing urea solution includes: having a preset water content gradient change table, which includes the water volume and gradient change under several conditions.

[0080] A urea content gradient change table is preset, which includes the urea amount and gradient change under several conditions.

[0081] If the concentration of the urea solution does not meet the fluctuation range of the urea solution concentration, it is deemed unqualified and the solution must be prepared again.

[0082] When the concentration of the urea solution is below the fluctuation range of the urea solution concentration, the urea solution is gradually increased with stirring until the concentration is appropriate.

[0083] When the concentration of the urea solution is higher than the concentration fluctuation range of the urea solution, the urea solution is gradually injected with water and stirred until the concentration is appropriate.

[0084] It is important to understand that the reconstitution process is not limited to one step. In order to achieve a more perfect standard, the initial solution will be adjusted multiple times to achieve the result closest to the requirements.

[0085] The method for determining the linkage between the electric valve status and the urea dissolving tank includes: having a urea storage tank level detection device pre-installed, and detecting the current urea storage tank level to obtain the urea storage tank level detection value.

[0086] There is a preset standard range for urea storage tank level. When the detected level of urea storage tank is not within the standard range, a command is sent to close the inlet valve of the urea storage tank, and the urea dissolving pump will automatically stop running.

[0087] Understandably, when the urea dissolving tank level drops below 300mm or the urea storage tank level exceeds 2800mm, the urea dissolving pump automatically stops operating, and the urea storage tank inlet valve closes accordingly. Then, the inlet and outlet valves of the just-stopped urea dissolving pump are closed, completing the urea solution delivery. During this process, after intelligent upgrades, the urea supply station achieves one-button urea solution delivery, and the sequential control program incorporates level interlocking between the storage tank and the dissolving tank, ensuring the safety of the delivery process.

[0088] The method for adjusting the environment for automatic urea solution delivery includes: detecting ammonia levels in the current environment; if the levels exceed the safe range, adjusting ventilation and temperature to maintain a suitable temperature.

[0089] Urea crystallization is observed in the equipment pipelines. A crystallization status map is preset. The current crystallization status is compared and local temperature adjustments are made.

[0090] Understandably, the liquid levels in the urea dissolving tank and urea storage tank are key concerns for operators. If the liquid level in the dissolving tank is too low, the urea dissolving pump will run dry, causing equipment damage. If the liquid level in the storage tank is too high, urea may overflow from the top of the tank, resulting in waste. In cases of poor ventilation, this could also lead to the accumulation of ammonia gas, threatening personal safety.

[0091] Step S4: Perform safety monitoring on the equipment operation process and issue early warnings for different situations.

[0092] Safety warnings can be issued for different situations, including: low liquid level in the dissolving tank, high liquid level in the dissolving tank, and safety environment warnings.

[0093] The low liquid level warning for the dissolving tank indicates that the liquid level in the dissolving tank has been consistently below the standard range for a period of time, triggering an alarm to remind the user to undergo maintenance.

[0094] The high liquid level warning for the dissolving tank indicates that the liquid level in the dissolving tank has been consistently higher than the standard range for a period of time. An alarm is triggered to remind maintenance personnel, and a safety and environmental warning is also activated to alert staff.

[0095] Safety and environmental early warnings include warnings about ammonia levels in the environment, alerting staff to evacuate when ammonia levels are too high.

[0096] This application discloses an automatic urea solution delivery method and system, including an information acquisition module, which acquires past urea solution delivery processes and equipment operation logs, analyzes the past urea solution delivery processes and equipment operation logs, and determines past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements.

[0097] The model building module establishes a first-time reference line for past urea solution concentration requirements, past urea solution density requirements, and past temperature requirements. Using the first-time reference line as the horizontal variable, it establishes past urea solution concentration requirement curves, past urea solution density requirement curves, and past temperature requirement curves respectively. The past urea solution concentration requirement curves, past urea solution density requirement curves, and past temperature requirement curves are aligned to generate a past urea solution delivery reference model.

[0098] The debugging and operation module prepares urea solution based on current comparison factors, determines the urea solution delivery model, obtains the urea solution evaluation rules for the current prepared solution, and judges the urea solution. If the urea solution is qualified, a delivery signal is sent to deliver the solution; if the urea solution is unqualified, a preparation signal is sent to re-prepare the solution. The module also obtains urea solution storage tank level detection data, determines the linkage between the electric valve status and the urea dissolving tank, obtains ambient ammonia concentration data and pipeline crystallization degree data, and adjusts the automatic urea solution delivery environment.

[0099] The safety early warning module monitors the equipment operation process and issues warnings for different situations.

[0100] Compared to the automatic delivery of urea solution, it has the following advantages:

[0101] 1. This application provides a method for providing safety warnings in response to different situations. When the liquid level in the dissolving tank is too low or too high, it can effectively prevent the urea dissolving pump from running dry, which could cause equipment damage and urea from overflowing from the top of the storage tank, resulting in waste.

[0102] 2. This application provides a method for adjusting the environment of automatic urea solution delivery, including ventilation adjustment and early warning, to reduce the risk of ammonia accumulation due to poor ventilation, which could threaten personal safety.

[0103] 3. This application provides a method for determining the linkage between the electric valve status and the urea dissolving tank. The urea supply station realizes one-click delivery of urea solution and sets up a liquid level interlock between the storage tank and the dissolving tank to ensure the safety of the delivery process.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for automatic delivery of a urea solution, characterized by, The method comprises the following steps: acquiring the flow and equipment operation log of the past urea solution delivery, analyzing the flow and equipment operation log of the past urea solution delivery, determining the past urea solution concentration requirement, the past urea solution density requirement and the past temperature requirement; establishing a first time reference line according to the past urea solution concentration requirement, the past urea solution density requirement and the past temperature requirement, and establishing a past urea solution concentration requirement curve, a past urea solution density requirement curve and a past temperature requirement curve respectively with the first time reference line as a horizontal variable; aligning the past urea solution concentration requirement curve, the past urea solution density requirement curve and the past temperature requirement curve to generate a past urea solution delivery reference model; initially preparing the urea solution according to the current comparison factors, and determining a urea solution delivery model; acquiring the urea solution evaluation rule of the current preparation, and determining the urea solution; if the urea solution evaluation is qualified, sending a delivery signal for solution delivery, and if the urea solution evaluation is unqualified, sending a preparation signal for re-preparation; acquiring the urea solution storage tank liquid level detection data, determining the electric valve state and the linkage relationship of the urea solution tank; acquiring the environmental ammonia concentration data and the pipeline crystallization degree data, and adjusting the urea solution automatic delivery environment; safety monitoring the equipment operation process, and safety warning in different situations; The method for generating the past urea solution delivery reference model comprises: establishing a vertical scanning line according to the past urea solution concentration requirement curve, the past urea solution density requirement curve and the past temperature requirement curve, and determining the past urea solution concentration requirement first reference point, the past urea solution density requirement first reference point and the past temperature requirement first reference point as the intersection points of the vertical scanning line and the past urea solution concentration requirement curve, the past urea solution density requirement curve and the past temperature requirement curve respectively; determining the position of the vertical scanning line according to the current comparison factors, and combining the determined urea solution concentration requirement first reference point, the urea solution density requirement first reference point and the temperature requirement first reference point to generate an initial urea solution delivery reference model.

2. The method of claim 1, wherein the urea solution is automatically delivered by a pump. The method for initially preparing the urea solution comprises: acquiring the current comparison factors, and determining the initial urea solution delivery reference model according to the current comparison factors; determining the current urea solution concentration requirement, the current urea solution density requirement and the current temperature requirement from the initial urea solution delivery reference model; presetting a urea solution preparation table, and determining the urea solution amount and the water injection amount according to the corresponding relationship between the current urea solution concentration requirement and the urea solution preparation table; presetting a stirring rule schematic table, and determining the stirring frequency and the rotating speed according to the current urea solution density requirement; adjusting the room temperature according to the current temperature requirement, and starting the equipment operation.

3. The method of claim 2, wherein the urea solution is automatically delivered by a pump. The urea solution evaluation method of the current preparation comprises: The urea solution evaluation includes two aspects of the density of the urea solution and the concentration of the urea solution; presetting a urea solution density detection mechanism and a urea solution density qualified range value, and determining the urea solution density to be qualified if the urea solution density is stable in the urea solution density qualified range value within a period of time. The preset urea solution concentration detection mechanism, the preset urea solution concentration range standard table, the urea solution concentration range standard table is provided with the urea solution concentration range floating standard value, and the urea solution concentration detection value meets the urea solution concentration floating range determination qualified.

4. The method of claim 3, wherein the urea solution is automatically delivered by a pump. The method for re-preparing the urea solution comprises: The preset water injection content gradient change table comprises the water injection amount and gradient change condition under several conditions; The preset urea content gradient change table comprises the urea amount and gradient change condition under several conditions; When the urea solution concentration detection value does not meet the urea solution concentration floating range determination unqualified, re-preparation is carried out; When the urea solution concentration detection value is lower than the urea solution concentration floating range, gradient urea increase and stirring are carried out on the urea solution until the concentration is appropriate; When the urea solution concentration detection value is higher than the urea solution concentration floating range, gradient water injection and stirring are carried out on the urea solution until the concentration is appropriate.

5. The method of claim 4, wherein the urea solution is automatically delivered by a pump. The method for determining the linkage relationship between the electric valve state and the urea solution tank comprises: The preset urea tank liquid level detection device detects the current urea tank liquid level to obtain a urea tank liquid level detection value; The preset urea tank liquid level standard range sends a command to close the urea tank inlet valve when the urea tank liquid level detection value is not within the urea tank liquid level standard range, and the urea solution pump automatically stops running.

6. The method of claim 4, wherein the urea solution is automatically delivered by a pump. The method for adjusting the automatic urea solution conveying environment comprises: When the ammonia content exceeds the safe range, ventilation adjustment and temperature adjustment are carried out to maintain the appropriate temperature; The device pipeline is observed for urea crystallization, and a preset crystallization condition atlas is compared with the current crystallization condition to carry out local temperature adjustment.

7. The method of claim 3, wherein the urea solution is automatically delivered by a pump. The safety warning under different conditions comprises: The safety warning comprises low urea tank liquid level warning, high urea tank liquid level warning and safety environment warning; The low urea tank liquid level warning refers to that the urea tank liquid level is detected to be always lower than the standard range for a period of time, and an alarm is given to remind maintenance; The high urea tank liquid level warning refers to that the urea tank liquid level is detected to be always higher than the standard range for a period of time, an alarm is given to remind maintenance, and the safety environment warning is started to remind the staff; The safety environment warning involves ammonia content warning, and the staff is reminded to evacuate when the ammonia content is too high.

8. An automatic urea solution delivery system for use in an automatic urea solution delivery method according to any one of claims 1 to 7, characterized in that, The method comprises: An information acquisition module acquires the past urea solution conveying process and device running log, analyzes the past urea solution conveying process and device running log, determines the past urea solution concentration demand, past urea solution density demand and past temperature demand; A model construction module establishes a first time reference line according to the past urea solution concentration demand, past urea solution density demand and past temperature demand, takes the first time reference line as a horizontal variable, respectively establishes a past urea solution concentration demand curve, past urea solution density demand curve and past temperature demand curve, and aligns the past urea solution concentration demand curve, past urea solution density demand curve and past temperature demand curve to generate a past urea solution conveying reference model; The debugging running module performs solution preparation on the urea solution according to the current comparison factor, determines a urea solution delivery model, obtains a urea solution evaluation rule of the current solution preparation, judges the urea solution, sends a delivery signal to deliver the solution if the urea solution is qualified, sends a solution preparation signal to re-prepare the solution if the urea solution is unqualified, obtains urea solution storage tank liquid level detection data, determines the linkage relationship between the electric valve state and the urea solution tank, obtains environmental ammonia concentration data and pipeline crystallization degree data, and adjusts the urea solution automatic delivery environment; The safety early warning module performs safety monitoring on the equipment running process and early warning on different situations.

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