Automatic water temperature adjusting system of urea hydrolyzer

Abstract

The invention relates to the technical field of thermal power generation, and discloses an automatic water temperature adjusting system for a urea hydrolyzer, which comprises a hydrolysis module for hydrolyzing urea and presetting a temperature threshold value of a urea solution; the detection module is used for detecting the temperature of the urea solution in the hydrolysis module and the internal reaction temperature; the heating module is used for providing a heat source for the hydrolysis module, a steam heating coil pipe is preset, and a steam adjusting valve is arranged on the steam heating coil pipe; the first operation module is used for determining the initial opening degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature; the second operation module is used for judging whether correction is needed or not after the first operation module determines the initial opening degree of the steam regulating valve; the adjusting module is used for judging whether risk adjustment is needed or not after the second operation module corrects the initial opening degree of the steam adjusting valve; the alarm module is used for giving out a prompt and an alarm according to the temperature of the urea solution to prevent the phenomenon that the temperature of the urea solution is too high in the hydrolysis process.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, and in particular to a system for automatically adjusting water temperature of a urea hydrolyzer. Background Art

[0002] Nitrogen oxides are one of the main pollutants of air pollution, which can cause serious harm to human health and the ecological environment, such as the formation of acid rain and photochemical smog. Thermal power plants and other industrial fields are one of the main sources of nitrogen oxide emissions. In order to reduce the emission of nitrogen oxides and protect the environment, it is necessary to denitrify the flue gas after combustion. SCR denitrification is currently the most widely used denitrification technology, which requires the use of ammonia as a reducing agent. Compared with liquid ammonia and ammonia water, urea ammonia production technology has a higher investment cost, but it occupies a small area, has a high degree of safety, and its operating costs are between liquid ammonia and ammonia water. Therefore, with the development of technology, urea hydrolysis ammonia production technology has gradually become an important reducing agent source technology for SCR denitrification technology.

[0003] However, the inventors of this application found that the above technology has at least the following technical problems in the process of implementing the technical solution of the invention in the embodiment of this application: During the hydrolysis process of urea, the operating personnel are required to manually adjust the steam regulating valve to control the temperature. If the operating personnel do not monitor properly, the steam regulating valve cannot be effectively controlled, which will affect the hydrolysis temperature and create safety hazards. Summary of the invention

[0004] The embodiment of the present invention provides a system for automatically adjusting water temperature of a urea hydrolyzer, which is used to solve the technical problem in the prior art that the water temperature of a urea solution in a urea hydrolysis process of a thermal power plant is easily too high.

[0005] In order to achieve the above object, the present invention provides a urea hydrolyzer automatic water temperature adjustment system, comprising: A hydrolysis module, used for hydrolyzing urea and presetting a urea solution temperature threshold; A detection module, used to detect the urea solution temperature and internal reaction temperature in the hydrolysis module; A heating module, used to provide a heat source for the hydrolysis module, wherein a steam heating coil is pre-set in the heating module, and a steam regulating valve is provided on the steam heating coil; A first operation module, used for determining an initial opening degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature; A second operation module, used for judging whether correction is needed after the first operation module determines the initial opening and closing degree of the steam regulating valve; an adjustment module, configured to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam control valve; The alarm module is used to issue reminders and alarms according to the temperature of the urea solution.

[0006] Furthermore, the first operation module is used to determine the initial opening degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature, including: The current urea solution temperature and the internal reaction temperature are obtained, and the current urea solution temperature and the internal reaction temperature are normalized, and the initial control coefficient of the steam regulating valve is calculated: ; in, is the initial control coefficient of the steam regulating valve, is the normalized urea solution temperature, is the weight of the urea solution temperature, is the normalized internal reaction temperature, is the weight of the internal reaction temperature, and =1, and Adjustments can be made based on historical data; The initial opening and closing degree of the steam regulating valve is selected according to the initial control coefficient of the steam regulating valve.

[0007] Furthermore, the first operation module is used to determine the initial opening degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature, including: Preset the first preset control coefficient of the steam regulating valve , the second preset control coefficient , the third preset control coefficient , and 0< < < ; The first adjustment coefficient S0, the second adjustment coefficient S1, the third adjustment coefficient S2, the fourth adjustment coefficient S3 of the steam regulating valve are preset, and 0 <S0<S1<S2<S3=1; According to the first preset control coefficient of the steam regulating valve , the second preset control coefficient , the third preset control coefficient Construct the first control interval of the steam regulating valve [0, ), the second control interval [ , ), the third control interval [ , ), the fourth control interval [ , ; When the initial control coefficient of the steam regulating valve belongs to the first control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S3, where is the multiplication symbol; When the initial control coefficient of the steam regulating valve belongs to the second control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S2, where is the multiplication symbol; When the initial control coefficient of the steam regulating valve belongs to the third control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S1, where is the multiplication symbol; When the initial control coefficient of the steam regulating valve belongs to the fourth control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S0, where is the multiplication symbol.

[0008] Furthermore, the second operation module is used to determine whether correction is required after the first operation module determines the initial opening and closing degree of the steam regulating valve, including: Acquiring the current urea solution temperature, if the current urea solution temperature is higher than the urea solution temperature threshold, determining that correction is required, and correcting the initial opening and closing degree of the steam regulating valve; If the current urea solution temperature is lower than or equal to the urea solution temperature threshold, it is determined that no correction is required.

[0009] Furthermore, the second operation module is used to determine whether correction is required after the first operation module determines the initial opening and closing degree of the steam regulating valve, including: presetting a second urea solution temperature threshold, wherein the second urea solution temperature threshold is less than the urea solution temperature threshold; The urea solution temperatures at multiple moments are obtained, and the steam control valve correction coefficient is calculated according to the urea solution temperatures at the multiple moments: ; Wherein, k is the correction coefficient of the steam regulating valve, n is the number of moments, is the moment weight, and , is the urea solution temperature at the i-th moment, is the urea solution temperature threshold, is the maximum temperature of urea solution at all times, is the second threshold value of the urea solution temperature; The initial opening and closing degree of the steam regulating valve is corrected according to the correction coefficient of the steam regulating valve, and the corrected opening and closing degree of the steam regulating valve = k Initial opening and closing degree of steam regulating valve, where is the multiplication symbol.

[0010] Furthermore, the regulating module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve, including: Pre-set correction preset cycle; According to the preset correction cycle, obtaining the urea solution temperature at the end time of each correction of the second operation module; If the urea solution temperature at the end time is higher than the urea solution temperature threshold, it is determined that the correction is a risk correction and risk adjustment is required, and the current steam control valve opening and closing degree is risk adjusted; If the urea solution temperature at the end time is lower than or equal to the urea solution temperature threshold, it is determined that the correction is a safe correction and no risk adjustment is required.

[0011] Furthermore, the regulating module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve, including: Obtaining the urea solution temperature at each time point in the preset correction period for each risk correction, and calculating the maximum temperature difference, the minimum temperature difference, the maximum temperature change rate, and the minimum temperature change rate for each risk correction in the preset correction period; The risk coefficient corresponding to each risk correction is calculated based on the maximum temperature difference, the minimum temperature difference, the maximum temperature change rate, and the minimum temperature change rate: ; in, is the risk coefficient of the jth risk correction, A, B, C, D, E, F are constants that can be adjusted based on historical data, e is an index, is the maximum temperature difference of the jth risk correction, is the minimum temperature difference of the jth risk correction, is the maximum temperature change rate of the jth risk correction, is the minimum temperature change rate for the jth risk correction.

[0012] Furthermore, the regulating module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve, including: Establish risk factor-risk adjustment mapping table; Each risk factor has a corresponding unique risk adjustment factor in the risk factor-risk adjustment mapping table; The risk adjustment is performed on the current steam control valve opening and closing degree according to the risk adjustment coefficient. The steam control valve opening and closing degree after risk adjustment = the current steam control valve opening and closing degree Risk adjustment factor, where is the multiplication symbol.

[0013] Furthermore, the heating module is used to provide a heat source for the hydrolysis module, including: The heating module is pre-set with a spare steam heating coil; Pre-set the estimated heating time and ideal temperature range of urea solution; If the heating time of the steam heating coil exceeds the estimated heating time and the urea solution temperature still does not reach the ideal temperature range of the urea solution, the standby steam heating coil is turned on; When the temperature of the urea solution reaches the ideal temperature range of the urea solution, the standby steam heating coil is turned off.

[0014] Furthermore, the alarm module is used to issue reminders and alarms according to the temperature of the urea solution, including: Get the current urea solution temperature; If the current urea solution temperature is higher than the urea solution temperature threshold, a high temperature alarm is issued to alert the operator.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a urea hydrolyzer automatic water temperature adjustment system. A first operation module selects an initial opening and closing degree of a steam regulating valve in a heating module according to the temperature of a urea solution and the temperature in a device itself to heat the urea solution, thereby avoiding waste of resources. Then, the temperature of the urea solution is further controlled by a second operation module. When the urea solution exceeds a preset temperature threshold, the second operation module controls the steam regulating valve to reduce the steam flow rate so that the temperature of the urea solution is gradually reduced, and a preset correction cycle is set. If the second operation module cannot achieve cooling within a specified range within a specified time, the regulating module intervenes and controls the steam regulating valve again to ensure that the urea solution can be kept within an ideal temperature range even in a long-term operation state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A structural schematic diagram of a urea hydrolyzer automatic water temperature adjustment system in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0020] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.

[0022] like Figure 1 As shown, an embodiment of the present invention discloses a system for automatically adjusting water temperature of a urea hydrolyzer, comprising: A hydrolysis module, used for hydrolyzing urea and presetting a urea solution temperature threshold; A detection module, used to detect the urea solution temperature and internal reaction temperature in the hydrolysis module; A heating module is used to provide a heat source for the hydrolysis module. A steam heating coil is pre-set in the heating module, and a steam regulating valve is provided on the steam heating coil; The first operation module is used to determine the initial opening and closing degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature; The second operation module is used to determine whether correction is needed after the first operation module determines the initial opening and closing degree of the steam regulating valve; A regulating module, used to determine whether risk regulation is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve; The alarm module is used to issue reminders and alarms according to the temperature of the urea solution.

[0023] In this embodiment, after the first operating module selects the initial opening and closing degree of the steam regulating valve, the second operating module cooperates with the regulating module to re-regulate the steam regulating valve.

[0024] In some embodiments of the present application, the first operation module is used to determine the initial opening and closing degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature, including: Get the current urea solution temperature and internal reaction temperature, normalize them, and calculate the initial control coefficient of the steam regulating valve: ; in, is the initial control coefficient of the steam regulating valve, is the normalized urea solution temperature, is the weight of urea solution temperature, is the normalized internal reaction temperature, is the weight of the internal reaction temperature, and =1, and Adjustments can be made based on historical data; The initial opening and closing degree of the steam regulating valve is selected according to the initial control coefficient of the steam regulating valve.

[0025] In this embodiment, the first operation module is used to determine the initial opening and closing degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature, including: Preset the first preset control coefficient of the steam regulating valve , the second preset control coefficient , the third preset control coefficient , and 0< < < ; The first adjustment coefficient S0, the second adjustment coefficient S1, the third adjustment coefficient S2, the fourth adjustment coefficient S3 of the steam regulating valve are preset, and 0 <S0<S1<S2<S3=1; According to the first preset control coefficient of the steam regulating valve , the second preset control coefficient , the third preset control coefficient Construct the first control interval of the steam regulating valve [0, ), the second control interval [ , ), the third control interval [ , ), the fourth control interval [ , ; When the initial control coefficient of the steam regulating valve belongs to the first control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S3, where is the multiplication symbol; When the initial control coefficient of the steam regulating valve belongs to the second control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S2, where is the multiplication symbol; When the initial control coefficient of the steam regulating valve belongs to the third control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S1, where is the multiplication symbol; When the initial control coefficient of the steam regulating valve belongs to the fourth control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S0, where is the multiplication symbol.

[0026] In this embodiment, if the obtained internal reaction temperature is lower or the urea solution temperature is lower, the obtained initial control coefficient of the steam regulating valve is lower, and the initial opening and closing degree selected by the steam regulating valve is larger.

[0027] The beneficial effect of the above technical solution is: the internal reaction temperature of the hydrolysis module can be used to heat the urea solution, so as to more reasonably allocate resources, ensure heating efficiency and avoid waste of resources.

[0028] In some embodiments of the present application, the second operation module is used to determine whether correction is required after the first operation module determines the initial opening and closing degree of the steam regulating valve, including: The current urea solution temperature is obtained. If the current urea solution temperature is higher than the urea solution temperature threshold, it is determined that correction is required, and the initial opening and closing degree of the steam regulating valve is corrected. If the current urea solution temperature is lower than or equal to the urea solution temperature threshold, it is determined that no correction is required.

[0029] In this embodiment, the second operation module is used to determine whether correction is required after the first operation module determines the initial opening and closing degree of the steam regulating valve, and includes: Presetting a second urea solution temperature threshold, the second urea solution temperature threshold being less than the urea solution temperature threshold; Obtain the urea solution temperature at multiple times, and calculate the steam control valve correction coefficient based on the urea solution temperature at multiple times: ; Among them, k is the steam control valve correction coefficient, n is the number of moments, is the moment weight, and , is the urea solution temperature at the i-th moment, is the urea solution temperature threshold, is the maximum temperature of urea solution at all times, is the second threshold value of urea solution temperature; The initial opening and closing degree of the steam regulating valve is corrected according to the steam regulating valve correction coefficient. The corrected steam regulating valve opening and closing degree = k Initial opening and closing degree of steam regulating valve, where is the multiplication symbol.

[0030] In this embodiment, the second urea solution temperature threshold is the lower limit of the preset ideal temperature range of the urea solution, and together with the urea solution temperature threshold, constitutes a complete ideal temperature range of the urea solution.

[0031] The beneficial effect of the above technical solution is that the second operation module dynamically adjusts the steam regulating valve to prevent the urea solution from overheating due to the fixed opening and closing degree of the steam regulating valve, thereby affecting the hydrolysis efficiency.

[0032] In some embodiments of the present application, the adjustment module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam control valve, including: Pre-set correction preset cycle; According to the preset correction cycle, the urea solution temperature at the end of each correction of the second operation module is obtained; If the urea solution temperature at the end time is higher than the urea solution temperature threshold, the correction is determined to be a risk correction and risk adjustment is required, and the current steam control valve opening and closing degree is risk adjusted; If the urea solution temperature is lower than or equal to the urea solution temperature threshold at the end time, it is determined that the correction is a safe correction and no risk adjustment is required.

[0033] In this embodiment, the preset correction period is the ideal cooling time, which is counted from the moment the second operation module intervenes to the end of the period. If the urea solution temperature is still higher than the urea solution temperature threshold during the ideal cooling time, it is determined as a risk correction and risk adjustment needs to be performed again.

[0034] In this embodiment, the adjustment module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam control valve, including: Obtain the urea solution temperature at each time point in the preset correction period for each risk correction, and calculate the maximum temperature difference, minimum temperature difference, maximum temperature change rate, and minimum temperature change rate for each risk correction in the preset correction period; The risk coefficient corresponding to each risk correction is calculated based on the maximum temperature difference, minimum temperature difference, maximum temperature change rate, and minimum temperature change rate: ; in, is the risk coefficient of the jth risk correction, A, B, C, D, E, F are constants that can be adjusted based on historical data, e is an index, is the maximum temperature difference of the jth risk correction, is the minimum temperature difference of the jth risk correction, is the maximum temperature change rate of the jth risk correction, is the minimum temperature change rate for the jth risk correction.

[0035] In this embodiment, the adjustment module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam control valve, including: Establish risk factor-risk adjustment mapping table; Each risk factor has a unique risk adjustment factor corresponding to it in the risk factor-risk adjustment mapping table; The risk adjustment is performed on the current steam control valve opening and closing degree according to the risk adjustment coefficient. The steam control valve opening and closing degree after risk adjustment = the current steam control valve opening and closing degree Risk adjustment factor, where is the multiplication symbol.

[0036] In this embodiment, different risk adjustment coefficients are selected according to different risk factors, and the risk adjustment coefficients can be modified or adjusted according to historical data.

[0037] The beneficial effect of the above technical solution is: avoiding the phenomenon of reduced urea hydrolysis efficiency caused by too slow cooling time after correction of the second operating module, and realizing a faster cooling operation when the urea solution is overheated.

[0038] In some embodiments of the present application, a heating module, used to provide a heat source for a hydrolysis module, comprises: The heating module is pre-set with a spare steam heating coil; Pre-set the estimated heating time and ideal temperature range of urea solution; If the heating time of the steam heating coil exceeds the estimated heating time and the urea solution temperature still does not reach the ideal temperature range of the urea solution, start the standby steam heating coil; When the urea solution temperature reaches the ideal temperature range of the urea solution, the standby steam heating coil is turned off.

[0039] In this embodiment, the estimated heating time is counted from the moment the steam regulating valve is opened. If the temperature of the urea solution still does not enter the ideal temperature range of the urea solution within the specified time, the standby steam heating coil is turned on for auxiliary heating.

[0040] The beneficial effect of the above technical solution is that when the urea solution is heated to the initial stage of the ideal temperature range, the heating cycle of a steam heating coil is prevented from being too long.

[0041] In some embodiments of the present application, the alarm module is used to issue reminders and alarms according to the temperature of the urea solution, including: Get the current urea solution temperature; If the current urea solution temperature is higher than the urea solution temperature threshold, a high temperature alarm is issued to alert the operator.

[0042] The beneficial effect of the above technical solution is that it can sound an alarm when the urea solution temperature is overheated during the urea hydrolysis process, so that the operating personnel can understand the operating status of the hydrolysis system in the first place.

[0043] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0044] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present invention may be used in combination with each other in any manner, and the fact that these combinations are not fully described in this specification is only for the sake of omitting space and saving resources.

[0045] Those skilled in the art can understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A urea hydrolyzer automatic water temperature adjustment system, characterized in that: include: A hydrolysis module, used for hydrolyzing urea and presetting a urea solution temperature threshold; A detection module, used to detect the urea solution temperature and internal reaction temperature in the hydrolysis module; A heating module, used to provide a heat source for the hydrolysis module, wherein a steam heating coil is pre-set in the heating module, and a steam regulating valve is provided on the steam heating coil; A first operation module, used for determining an initial opening degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature; A second operation module, used for judging whether correction is needed after the first operation module determines the initial opening and closing degree of the steam regulating valve; an adjustment module, configured to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam control valve; The alarm module is used to issue reminders and alarms according to the temperature of the urea solution.

2. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 1, characterized in that: The first operation module is used to determine the initial opening and closing degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature, including: The current urea solution temperature and the internal reaction temperature are obtained, and the current urea solution temperature and the internal reaction temperature are normalized, and the initial control coefficient of the steam regulating valve is calculated: ； in, is the initial control coefficient of the steam regulating valve, is the normalized urea solution temperature, is the weight of the urea solution temperature, is the normalized internal reaction temperature, is the weight of the internal reaction temperature, and =1, and Adjustments can be made based on historical data; The initial opening and closing degree of the steam regulating valve is selected according to the initial control coefficient of the steam regulating valve.

3. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 2, characterized in that: The first operation module is used to determine the initial opening and closing degree of the steam regulating valve according to the urea solution temperature and the internal reaction temperature, including: Preset the first preset control coefficient of the steam regulating valve , the second preset control coefficient , the third preset control coefficient , and 0< < < ; The first adjustment coefficient S0, the second adjustment coefficient S1, the third adjustment coefficient S2, the fourth adjustment coefficient S3 of the steam regulating valve are preset, and 0 <S0<S1<S2<S3=1; According to the first preset control coefficient of the steam regulating valve , the second preset control coefficient , the third preset control coefficient Construct the first control interval of the steam regulating valve [0, ), the second control interval [ , ), the third control interval [ , ), the fourth control interval [ , ; When the initial control coefficient of the steam regulating valve belongs to the first control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S3; When the initial control coefficient of the steam regulating valve belongs to the second control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S2; When the initial control coefficient of the steam regulating valve belongs to the third control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S1; When the initial control coefficient of the steam regulating valve belongs to the fourth control interval, the initial opening degree of the steam regulating valve = the maximum opening degree of the steam regulating valve S0.

4. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 1, characterized in that: The second operation module is used to determine whether correction is required after the first operation module determines the initial opening and closing degree of the steam regulating valve, and includes: Acquiring the current urea solution temperature, if the current urea solution temperature is higher than the urea solution temperature threshold, determining that correction is required, and correcting the initial opening and closing degree of the steam regulating valve; If the current urea solution temperature is lower than or equal to the urea solution temperature threshold, it is determined that no correction is required.

5. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 4, characterized in that: The second operation module is used to determine whether correction is required after the first operation module determines the initial opening and closing degree of the steam regulating valve, and includes: presetting a second urea solution temperature threshold, wherein the second urea solution temperature threshold is less than the urea solution temperature threshold; The urea solution temperatures at multiple moments are obtained, and the steam control valve correction coefficient is calculated according to the urea solution temperatures at the multiple moments: ； Wherein, k is the correction coefficient of the steam regulating valve, n is the number of moments, is the moment weight, and , is the urea solution temperature at the i-th moment, is the urea solution temperature threshold, is the maximum temperature of urea solution at all times, is the second threshold value of the urea solution temperature; The initial opening and closing degree of the steam regulating valve is corrected according to the correction coefficient of the steam regulating valve, and the corrected opening and closing degree of the steam regulating valve = k Initial opening and closing degree of the steam regulating valve.

6. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 1, characterized in that: The regulating module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve, and includes: Pre-set correction preset cycle; According to the preset correction cycle, obtaining the urea solution temperature at the end time of each correction of the second operation module; If the urea solution temperature at the end time is higher than the urea solution temperature threshold, it is determined that the correction is a risk correction and risk adjustment is required, and the current steam control valve opening and closing degree is risk adjusted; If the urea solution temperature at the end time is lower than or equal to the urea solution temperature threshold, it is determined that the correction is a safe correction and no risk adjustment is required.

7. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 6, characterized in that: The regulating module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve, and includes: Obtaining the urea solution temperature at each time point in the preset correction period for each risk correction, and respectively calculating the maximum temperature difference, the minimum temperature difference, the maximum temperature change rate, and the minimum temperature change rate for each risk correction in the preset correction period; The risk coefficient corresponding to each risk correction is calculated based on the maximum temperature difference, the minimum temperature difference, the maximum temperature change rate, and the minimum temperature change rate: ; in, is the risk coefficient of the jth risk correction, A, B, C, D, E, F are constants that can be adjusted based on historical data, e is an index, is the maximum temperature difference of the jth risk correction, is the minimum temperature difference of the jth risk correction, is the maximum temperature change rate of the j-th risk correction, is the minimum temperature change rate for the jth risk correction.

8. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 7, characterized in that: The regulating module is used to determine whether risk adjustment is required after the second operation module corrects the initial opening and closing degree of the steam regulating valve, and includes: Establish risk factor-risk adjustment mapping table; Each risk factor has a corresponding unique risk adjustment factor in the risk factor-risk adjustment mapping table; The risk adjustment is performed on the current steam control valve opening and closing degree according to the risk adjustment coefficient. The steam control valve opening and closing degree after risk adjustment = the current steam control valve opening and closing degree Risk adjustment factor.

9. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 1, characterized in that: The heating module is used to provide a heat source for the hydrolysis module, and comprises: The heating module is pre-set with a spare steam heating coil; Pre-set the estimated heating time and ideal temperature range of urea solution; If the heating time of the steam heating coil exceeds the estimated heating time and the urea solution temperature still does not reach the ideal temperature range of the urea solution, the standby steam heating coil is turned on; When the temperature of the urea solution reaches the ideal temperature range of the urea solution, the standby steam heating coil is turned off.

10. The automatic water temperature adjustment system for a urea hydrolyzer according to claim 1, characterized in that: The alarm module is used to issue reminders and alarms according to the temperature of the urea solution, including: Get the current urea solution temperature; If the current urea solution temperature is higher than the urea solution temperature threshold, a high temperature alarm is issued to alert the operator.

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