Urea pyrolysis ammonia production system and control method thereof

Abstract

The invention relates to the technical field of urea-to-ammonia, and discloses a urea pyrolysis-to-ammonia system and a control method thereof.A urea storage device dissolves urea in water to obtain a urea solution; the urea distribution device distributes a urea solution according to the requirements of the pyrolysis process; the urea pyrolysis device collects a plurality of historical urea pyrolysis ammonia production records, calculates a historical urea pyrolysis ammonia production partial difference coefficient, and sets a working strategy of an electric heater; the ammonia gas separation device is used for separating the prepared ammonia gas and recycling residual by-products; the ammonia monitoring device collects real-time working parameters of the urea pyrolysis device in real time and judges whether the urea pyrolysis device has potential safety hazards or not, if yes, an alarm is given out, adaptive adjustment of the urea pyrolysis ammonia production temperature is achieved, the control precision and control efficiency of the urea pyrolysis ammonia production temperature are guaranteed, the ammonia yield is guaranteed, and the urea decomposition efficiency is improved. And meanwhile, the generation of byproducts is reduced, and efficient and stable ammonia gas production is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of urea ammonia production, and in particular to a urea pyrolysis ammonia production system and a control method thereof. Background Art

[0002] In modern industry and energy, ammonia is a key chemical raw material, widely used in fertilizer production, plastics manufacturing, pharmaceutical synthesis, and other industries. With increasingly stringent environmental regulations, the requirements for controlling nitrogen oxide (NOx) emissions are also becoming increasingly stringent. To effectively reduce NOx emissions in flue gas, selective catalytic reduction (SCR) technology is widely used. Urea, a highly efficient reducing agent, is converted into ammonia through thermal decomposition in the SCR system. This ammonia reacts with NOx to produce nitrogen and water, thereby reducing NOx emissions.

[0003] Urea pyrolysis typically requires high temperatures, is complex to operate, and consumes a lot of energy. With the continuous advancement of technology, urea pyrolysis technology for ammonia production has made significant progress. Some urea pyrolysis temperature control systems directly spray urea solution into pre-set high-temperature flue gas. However, this system has a relatively simple approach to flue gas temperature control. The flue gas temperature is set by experienced staff and cannot be adaptively adjusted based on historical ammonia production results. This results in inaccurate urea pyrolysis temperature control, unstable ammonia production, and the easy generation of by-products. Therefore, the development of a urea pyrolysis system with intelligent temperature control is particularly important. Summary of the Invention

[0004] An embodiment of the present invention provides a urea pyrolysis ammonia production system and a control method thereof. The present invention can analyze historical ammonia production effects, thereby achieving adaptive adjustment of the urea pyrolysis ammonia production temperature, ensuring the control accuracy and control efficiency of the urea pyrolysis ammonia production temperature, ensuring ammonia production, improving urea decomposition efficiency, reducing energy consumption, and reducing the generation of by-products, thereby achieving efficient and stable ammonia production.

[0005] In order to achieve the above object, the present invention provides a urea pyrolysis ammonia production system, comprising: a urea storage device, used for dissolving urea in water to obtain a urea solution, and storing the urea solution; a urea distribution device, used to measure the flow rate and concentration of the urea solution and distribute the urea solution according to the requirements of the pyrolysis process; a urea pyrolysis device for collecting a plurality of historical urea pyrolysis ammonia production records, analyzing the historical urea pyrolysis ammonia production records, calculating a historical urea pyrolysis ammonia production deviation coefficient based on the analysis results, and setting an operating strategy of the electric heater according to the historical urea pyrolysis ammonia production deviation coefficient; An ammonia separation device is used to separate the produced ammonia and recycle the remaining by-products; The ammonia monitoring device is used to collect the real-time working parameters of the urea pyrolysis device in real time, and determine whether the urea pyrolysis device has safety hazards based on the real-time working parameters. If so, an alarm is issued.

[0006] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to collect the historical actual ammonia production and the historical expected ammonia production corresponding to each historical urea record; The urea pyrolysis device is used to divide the historical urea pyrolysis ammonia production records into historical abnormal urea pyrolysis ammonia production records and historical expected urea pyrolysis ammonia production records according to the relationship between the historical actual ammonia production and the historical expected ammonia production; The urea pyrolysis device is used to extract the historical actual ammonia production and the historical expected ammonia production corresponding to the historical abnormal urea pyrolysis ammonia production record, and fit the historical actual ammonia production curve according to the historical actual ammonia production; The urea pyrolysis device is used to fit a historical expected ammonia production curve according to the historical expected ammonia production; The urea pyrolysis device is used to determine whether the historical actual ammonia production curve and the historical expected ammonia production curve have an intersection, and if not, extract the maximum historical actual ammonia production from all historical expected urea pyrolysis ammonia production records; The urea pyrolysis device is used to respectively calculate the difference between the historical actual ammonia production corresponding to each historical abnormal urea pyrolysis ammonia production record and the maximum historical actual ammonia production; The urea pyrolysis device is used to count the number of historical abnormal urea pyrolysis ammonia production records and the number of historical expected urea pyrolysis ammonia production records; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on the historical actual ammonia production difference, the historical abnormal urea pyrolysis ammonia production record quantity and the historical expected urea pyrolysis ammonia production record quantity; The urea pyrolysis device is used to randomly select a curve intersection point as a target curve intersection point, and determine the curve distance from each historical actual ammonia production to the target curve intersection point; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on all curve distances.

[0007] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the first historical urea pyrolysis ammonia production deviation coefficient according to the following formula: ; Among them, q1 is the first historical urea pyrolysis ammonia production deviation coefficient calculated based on the historical actual ammonia production difference, the number of historical abnormal urea pyrolysis ammonia production records and the historical expected urea pyrolysis ammonia production records, w1 is the first calculation coefficient, e1 is the number of historical abnormal urea pyrolysis ammonia production records, e2 is the historical expected urea pyrolysis ammonia production records, w2 is the second calculation coefficient, t r is the difference in actual ammonia production in the rth history, t max is the maximum historical actual ammonia production difference.

[0008] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the curve distance mean of all curve distances; The urea pyrolysis device is configured to divide the corresponding curve distance into a first curve distance set when the curve distance is less than or equal to the curve distance mean; The urea pyrolysis device is used for dividing the corresponding curve distance into a second curve distance set when the curve distance is greater than the curve distance mean; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on the first curve distance set and the second curve distance set: ; Among them, q2 is the first historical urea thermal decomposition ammonia production deviation coefficient calculated based on the first curve distance set and the second curve distance set, u is the curve distance mean, p1 is the mean corresponding to the first curve distance set, and p2 is the mean corresponding to the second curve distance set.

[0009] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to determine the historical actual ammonia production and the historical actual urea pyrolysis temperature corresponding to each historical abnormal urea pyrolysis ammonia production record; The urea pyrolysis device is used to randomly select a historical abnormal urea pyrolysis ammonia production record and extract the corresponding first historical actual ammonia production and first historical actual urea pyrolysis temperature; The urea pyrolysis device is used to randomly select another historical abnormal urea pyrolysis ammonia production record and extract the corresponding second historical actual ammonia production and second historical actual urea pyrolysis temperature; The urea pyrolysis device is used to calculate a second historical actual ammonia production difference between the first historical actual ammonia production and the second historical actual ammonia production; The urea pyrolysis device is used to extract the maximum historical actual ammonia production and the minimum historical actual ammonia production from all historical abnormal urea pyrolysis ammonia production records, and calculate the historical actual ammonia production range of the maximum historical actual ammonia production and the minimum historical actual ammonia production; The urea pyrolysis device is used to calculate the ratio of the second historical actual ammonia production difference value to the historical actual ammonia production extreme difference value.

[0010] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to calculate a second historical actual urea pyrolysis temperature of the first historical actual urea pyrolysis temperature and the second historical actual urea pyrolysis temperature; The urea pyrolysis device is used to extract the maximum historical actual urea pyrolysis temperature and the minimum historical actual urea pyrolysis temperature from all historical abnormal urea pyrolysis ammonia production records, and calculate the historical actual urea pyrolysis temperature range of the maximum historical actual urea pyrolysis temperature and the minimum historical actual urea pyrolysis temperature; The urea pyrolysis device is used to calculate the historical actual urea pyrolysis temperature difference ratio between the second historical actual urea pyrolysis temperature and the historical actual urea pyrolysis temperature extreme difference value; The urea pyrolysis device is used to calculate the product of the historical actual ammonia production difference ratio and the historical actual urea pyrolysis temperature difference ratio as a factor to be calculated; The urea pyrolysis device is used to extract the remaining historical abnormal urea pyrolysis ammonia production records and calculate a plurality of factors to be calculated; The urea pyrolysis device is used to calculate the second historical urea pyrolysis ammonia production deviation coefficient based on all factors to be calculated.

[0011] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the second historical urea pyrolysis ammonia production deviation coefficient according to the following formula: ; Among them, s is the second historical urea thermal decomposition ammonia production deviation coefficient, f is the number of factors to be calculated, hi is the i-th factor to be calculated, hmin is the minimum factor to be calculated, hmax is the maximum factor to be calculated, For all The maximum value in .

[0012] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the sum of the first historical urea pyrolysis ammonia production deviation coefficient and the second historical urea pyrolysis ammonia production deviation coefficient, and use the sum as the historical urea pyrolysis ammonia production deviation coefficient.

[0013] Furthermore, the urea pyrolysis device is used for: The urea pyrolysis device is used to obtain a current working strategy of the electric heater, wherein the current working strategy includes a current working power of the electric heater; The urea pyrolysis device is used to preset a first preset historical urea pyrolysis ammonia production deviation coefficient and a second preset historical urea pyrolysis ammonia production deviation coefficient; The urea pyrolysis device is used to preset a first preset setting coefficient, a second preset setting coefficient and a third preset setting coefficient; The urea pyrolysis device is configured to calculate a product value of the first preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is less than the first preset historical urea pyrolysis ammonia production deviation coefficient, and use the product value as the current operating strategy of the electric heater; The urea pyrolysis device is configured to calculate a product value of the second preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is greater than or equal to the first preset historical urea pyrolysis ammonia production deviation coefficient and is less than the second preset historical urea pyrolysis ammonia production deviation coefficient, and use the product value as the current operating strategy of the electric heater; The urea pyrolysis device is used to calculate the product value of the third preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is greater than or equal to the second preset historical urea pyrolysis ammonia production deviation coefficient, and use it as the current operating strategy of the electric heater.

[0014] In order to achieve the above object, the present invention also provides a method for controlling urea pyrolysis to produce ammonia, comprising: dissolving urea in water to obtain a urea solution, and storing the urea solution; Measuring the flow rate and concentration of the urea solution and distributing the urea solution according to the requirements of the pyrolysis process; Collecting multiple historical urea pyrolysis ammonia production records, analyzing the historical urea pyrolysis ammonia production records, calculating the historical urea pyrolysis ammonia production deviation coefficient based on the analysis results, and setting the operating strategy of the electric heater according to the historical urea pyrolysis ammonia production deviation coefficient; Separate the produced ammonia and recycle the remaining by-products; The real-time operating parameters of the urea pyrolysis device are collected in real time, and it is determined whether the urea pyrolysis device has a safety hazard according to the real-time operating parameters. If so, an alarm is issued.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a urea pyrolysis ammonia production system and a control method thereof. A urea storage device dissolves urea in water to obtain a urea solution; a urea distribution device distributes the urea solution according to the requirements of the pyrolysis process; the urea pyrolysis device collects a plurality of historical urea pyrolysis ammonia production records, calculates the historical urea pyrolysis ammonia production deviation coefficient, and sets the working strategy of the electric heater; an ammonia separation device separates the produced ammonia and recycles the remaining by-products; an ammonia monitoring device collects real-time working parameters of the urea pyrolysis device in real time, determines whether the urea pyrolysis device has safety hazards, and if so, issues an alarm to realize adaptive adjustment of the urea pyrolysis ammonia production temperature, ensure the control accuracy and control efficiency of the urea pyrolysis ammonia production temperature, ensure ammonia production, improve urea decomposition efficiency, reduce energy consumption, and reduce the generation of by-products, thereby realizing efficient and stable ammonia production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings: Figure 1 The figure shows a schematic structural diagram of a urea pyrolysis ammonia production control system according to an embodiment of the present invention; Figure 2 A flow chart of a method for controlling the production of ammonia by pyrolysis of urea according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0017] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0018] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this 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 cannot be understood as a limitation on this application.

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

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the 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 urea pyrolysis ammonia production system, comprising: a urea storage device, used for dissolving urea in water to obtain a urea solution, and storing the urea solution; a urea distribution device, used to measure the flow rate and concentration of the urea solution and distribute the urea solution according to the requirements of the pyrolysis process; a urea pyrolysis device for collecting a plurality of historical urea pyrolysis ammonia production records, analyzing the historical urea pyrolysis ammonia production records, calculating a historical urea pyrolysis ammonia production deviation coefficient based on the analysis results, and setting an operating strategy of the electric heater according to the historical urea pyrolysis ammonia production deviation coefficient; An ammonia separation device is used to separate the produced ammonia and recycle the remaining by-products; The ammonia monitoring device is used to collect the real-time working parameters of the urea pyrolysis device in real time, and determine whether the urea pyrolysis device has safety hazards based on the real-time working parameters. If so, an alarm is issued.

[0023] In this embodiment, the urea storage device includes a urea dissolution tank and a urea solution storage tank. The urea dissolution tank, designed from stainless steel or corrosion-resistant material, dissolves urea in a certain amount of water to form a uniform urea solution, ensuring consistent quality. The urea solution storage tank is where the dissolved urea solution is stored and is equipped with insulation to prevent a rapid drop in solution temperature, which could affect thermal decomposition efficiency.

[0024] In this embodiment, the urea distribution device includes a metering and distribution device, which is responsible for accurately measuring the flow rate and concentration of the urea solution and accurately distributing it according to the requirements of the pyrolysis process to ensure the continuity of the process.

[0025] In this embodiment, the urea pyrolysis apparatus includes an adiabatic decomposition chamber and an electric heater. The adiabatic decomposition chamber utilizes a high-temperature insulation structure to prevent excessive heat release during urea decomposition. The insulation effectively maintains the temperature within the reaction chamber within an ideal range, for example, 150-200°C, to facilitate the decomposition of urea into ammonia and carbon dioxide. The electric heater provides the required heat energy, ensuring heating efficiency through intelligent control technology. The temperature can also be controlled through programmable control to achieve a precise pyrolysis process.

[0026] In this embodiment, the ammonia separation device includes ammonia generation and separation: After pyrolysis, ammonia escapes from the reaction chamber and enters gas separation equipment (such as a condenser and drying tower), where it is condensed and dried to remove any moisture and byproducts. Byproduct treatment: Remaining byproducts that have not been converted to ammonia, such as carbon dioxide or water vapor, can be recycled, such as in a scrubber, compressed, or stored for subsequent processing.

[0027] In this embodiment, the ammonia monitoring device includes a safety valve, pressure monitoring equipment, and an emergency pressure relief system to prevent safety issues caused by excessive pressure. Furthermore, flue gas and emission treatment facilities are required to comply with environmental regulations. Through precise process control and efficient pyrolysis equipment, the efficient conversion of urea to ammonia is achieved while simultaneously considering environmental and safety factors, ensuring the economic and sustainable nature of the entire pyrolysis process.

[0028] The beneficial effects of the above technical solution are: the present invention realizes adaptive adjustment of the temperature of urea pyrolysis to produce ammonia, ensures the control accuracy and control efficiency of the temperature of urea pyrolysis to produce ammonia, ensures the ammonia output, improves the urea decomposition efficiency, reduces energy consumption, and at the same time reduces the generation of by-products, thereby realizing efficient and stable ammonia production.

[0029] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to collect the historical actual ammonia production and the historical expected ammonia production corresponding to each historical urea record; The urea pyrolysis device is used to divide the historical urea pyrolysis ammonia production records into historical abnormal urea pyrolysis ammonia production records and historical expected urea pyrolysis ammonia production records according to the relationship between the historical actual ammonia production and the historical expected ammonia production; The urea pyrolysis device is used to extract the historical actual ammonia production and the historical expected ammonia production corresponding to the historical abnormal urea pyrolysis ammonia production record, and fit the historical actual ammonia production curve according to the historical actual ammonia production; The urea pyrolysis device is used to fit a historical expected ammonia production curve according to the historical expected ammonia production; The urea pyrolysis device is used to determine whether the historical actual ammonia production curve and the historical expected ammonia production curve have an intersection, and if not, extract the maximum historical actual ammonia production from all historical expected urea pyrolysis ammonia production records; The urea pyrolysis device is used to respectively calculate the difference between the historical actual ammonia production corresponding to each historical abnormal urea pyrolysis ammonia production record and the maximum historical actual ammonia production; The urea pyrolysis device is used to count the number of historical abnormal urea pyrolysis ammonia production records and the number of historical expected urea pyrolysis ammonia production records; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on the historical actual ammonia production difference, the historical abnormal urea pyrolysis ammonia production record quantity and the historical expected urea pyrolysis ammonia production record quantity; The urea pyrolysis device is used to randomly select a curve intersection point as a target curve intersection point, and determine the curve distance from each historical actual ammonia production to the target curve intersection point; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on all curve distances.

[0030] In this embodiment, the historical actual ammonia production refers to the actual value obtained, and the historical expected ammonia production refers to the desired value obtained.

[0031] In this embodiment, if the historical actual ammonia production meets the historical expected ammonia production, it is classified as a historical expected urea pyrolysis ammonia production record; otherwise, it is classified as a historical abnormal urea pyrolysis ammonia production record.

[0032] In this embodiment, the historical actual ammonia production curve and the historical expected ammonia production curve may or may not have an intersection.

[0033] In this embodiment, a first historical urea pyrolysis ammonia production deviation coefficient can be calculated based on the difference in historical actual ammonia production, the number of historical abnormal urea pyrolysis ammonia production records, and the number of historical expected urea pyrolysis ammonia production records. Alternatively, the first historical urea pyrolysis ammonia production deviation coefficient can be calculated based on all curve distances. Two methods for calculating the first historical urea pyrolysis ammonia production deviation coefficient are provided.

[0034] The beneficial effect of the above technical solution is: the present invention calculates the first historical urea pyrolysis ammonia production deviation coefficient based on the historical actual ammonia production difference, the historical abnormal urea pyrolysis ammonia production record number and the historical expected urea pyrolysis ammonia production record number, or calculates the first historical urea pyrolysis ammonia production deviation coefficient based on all curve distances, thereby ensuring the comprehensiveness and versatility of the calculation of the first historical urea pyrolysis ammonia production deviation coefficient and ensuring the calculation accuracy.

[0035] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to calculate the first historical urea pyrolysis ammonia production deviation coefficient according to the following formula: ; Among them, q1 is the first historical urea pyrolysis ammonia production deviation coefficient calculated based on the historical actual ammonia production difference, the number of historical abnormal urea pyrolysis ammonia production records and the historical expected urea pyrolysis ammonia production records, w1 is the first calculation coefficient, e1 is the number of historical abnormal urea pyrolysis ammonia production records, e2 is the historical expected urea pyrolysis ammonia production records, w2 is the second calculation coefficient, t r is the difference in actual ammonia production in the rth history, t max is the maximum historical actual ammonia production difference.

[0036] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to calculate the curve distance mean of all curve distances; The urea pyrolysis device is configured to divide the corresponding curve distance into a first curve distance set when the curve distance is less than or equal to the curve distance mean; The urea pyrolysis device is used for dividing the corresponding curve distance into a second curve distance set when the curve distance is greater than the curve distance mean; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on the first curve distance set and the second curve distance set: ; Among them, q2 is the first historical urea thermal decomposition ammonia production deviation coefficient calculated based on the first curve distance set and the second curve distance set, u is the curve distance mean, p1 is the mean corresponding to the first curve distance set, and p2 is the mean corresponding to the second curve distance set.

[0037] In this embodiment, the calculation method of the curve distance mean is not further described.

[0038] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to determine the historical actual ammonia production and the historical actual urea pyrolysis temperature corresponding to each historical abnormal urea pyrolysis ammonia production record; The urea pyrolysis device is used to randomly select a historical abnormal urea pyrolysis ammonia production record and extract the corresponding first historical actual ammonia production and first historical actual urea pyrolysis temperature; The urea pyrolysis device is used to randomly select another historical abnormal urea pyrolysis ammonia production record and extract the corresponding second historical actual ammonia production and second historical actual urea pyrolysis temperature; The urea pyrolysis device is used to calculate a second historical actual ammonia production difference between the first historical actual ammonia production and the second historical actual ammonia production; The urea pyrolysis device is used to extract the maximum historical actual ammonia production and the minimum historical actual ammonia production from all historical abnormal urea pyrolysis ammonia production records, and calculate the historical actual ammonia production range of the maximum historical actual ammonia production and the minimum historical actual ammonia production; The urea pyrolysis device is used to calculate the ratio of the second historical actual ammonia production difference value to the historical actual ammonia production extreme difference value.

[0039] In this embodiment, for the sake of distinction, a randomly selected historical abnormal urea pyrolysis ammonia production record and its corresponding historical actual ammonia production and historical actual urea pyrolysis temperature are used as the first historical actual ammonia production and the first historical actual urea pyrolysis temperature.

[0040] In this embodiment, for the sake of distinction, another randomly selected historical abnormal urea pyrolysis ammonia production record and its corresponding historical actual ammonia production and historical actual urea pyrolysis temperature are used as the second historical actual ammonia production and the second historical actual urea pyrolysis temperature.

[0041] The beneficial effect of the above technical solution is that the present invention calculates the ratio of the second historical actual ammonia production difference to the historical actual ammonia production extreme difference, which provides a basis for calculating the second historical urea pyrolysis ammonia production deviation coefficient.

[0042] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to calculate a second historical actual urea pyrolysis temperature of the first historical actual urea pyrolysis temperature and the second historical actual urea pyrolysis temperature; The urea pyrolysis device is used to extract the maximum historical actual urea pyrolysis temperature and the minimum historical actual urea pyrolysis temperature from all historical abnormal urea pyrolysis ammonia production records, and calculate the historical actual urea pyrolysis temperature range of the maximum historical actual urea pyrolysis temperature and the minimum historical actual urea pyrolysis temperature; The urea pyrolysis device is used to calculate the historical actual urea pyrolysis temperature difference ratio between the second historical actual urea pyrolysis temperature and the historical actual urea pyrolysis temperature extreme difference value; The urea pyrolysis device is used to calculate the product of the historical actual ammonia production difference ratio and the historical actual urea pyrolysis temperature difference ratio as a factor to be calculated; The urea pyrolysis device is used to extract the remaining historical abnormal urea pyrolysis ammonia production records and calculate a plurality of factors to be calculated; The urea pyrolysis device is used to calculate the second historical urea pyrolysis ammonia production deviation coefficient based on all factors to be calculated.

[0043] In this embodiment, one factor to be calculated can be obtained from every two historical abnormal urea pyrolysis ammonia production records. Therefore, multiple factors to be calculated can be obtained.

[0044] The beneficial effect of the above technical solution is that the present invention calculates the ratio of the second historical actual urea pyrolysis temperature to the historical actual urea pyrolysis temperature extreme value, and also provides a basis for calculating the second historical urea pyrolysis ammonia production deviation coefficient.

[0045] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to calculate the second historical urea pyrolysis ammonia production deviation coefficient according to the following formula: ; Among them, s is the second historical urea thermal decomposition ammonia production deviation coefficient, f is the number of factors to be calculated, hi is the i-th factor to be calculated, hmin is the minimum factor to be calculated, hmax is the maximum factor to be calculated, For all The maximum value in .

[0046] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to calculate the sum of the first historical urea pyrolysis ammonia production deviation coefficient and the second historical urea pyrolysis ammonia production deviation coefficient, and use the sum as the historical urea pyrolysis ammonia production deviation coefficient.

[0047] The beneficial effect of the above technical solution is that the present invention calculates the sum of the first historical urea pyrolysis ammonia production deviation coefficient and the second historical urea pyrolysis ammonia production deviation coefficient, and uses it as the historical urea pyrolysis ammonia production deviation coefficient, thereby ensuring the calculation accuracy of the historical urea pyrolysis ammonia production deviation coefficient and avoiding errors.

[0048] In some embodiments of the present application, the urea pyrolysis device is used to: The urea pyrolysis device is used to obtain a current working strategy of the electric heater, wherein the current working strategy includes a current working power of the electric heater; The urea pyrolysis device is used to preset a first preset historical urea pyrolysis ammonia production deviation coefficient and a second preset historical urea pyrolysis ammonia production deviation coefficient; The urea pyrolysis device is used to preset a first preset setting coefficient, a second preset setting coefficient and a third preset setting coefficient; The urea pyrolysis device is configured to calculate a product value of the first preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is less than the first preset historical urea pyrolysis ammonia production deviation coefficient, and use the product value as the current operating strategy of the electric heater; The urea pyrolysis device is configured to calculate a product value of the second preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is greater than or equal to the first preset historical urea pyrolysis ammonia production deviation coefficient and is less than the second preset historical urea pyrolysis ammonia production deviation coefficient, and use the product value as the current operating strategy of the electric heater; The urea pyrolysis device is used to calculate the product value of the third preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is greater than or equal to the second preset historical urea pyrolysis ammonia production deviation coefficient, and use it as the current operating strategy of the electric heater.

[0049] In this embodiment, the first preset historical deviation coefficient of urea pyrolysis to ammonia production is smaller than the second preset historical deviation coefficient of urea pyrolysis to ammonia production.

[0050] In this embodiment, the first preset setting coefficient is smaller than the second preset setting coefficient and smaller than the third preset setting coefficient.

[0051] The beneficial effect of the above technical solution is: the present invention selects the corresponding preset setting coefficient according to the historical urea pyrolysis ammonia production deviation coefficient, the first preset historical urea pyrolysis ammonia production deviation coefficient and the second preset historical urea pyrolysis ammonia production deviation coefficient, and adjusts the current working power of the electric heater. On the one hand, it realizes the dynamic adjustment of the current working power, and on the other hand, it ensures the efficient production of ammonia.

[0052] In order to further illustrate the technical idea of ​​the present invention, the technical solution of the present invention is now described in combination with specific application scenarios.

[0053] Correspondingly, such as Figure 2 As shown, the present application also provides a method for controlling urea pyrolysis to produce ammonia, comprising: S110: dissolving urea in water to obtain a urea solution, and storing the urea solution; S120: measuring the flow rate and concentration of the urea solution and distributing the urea solution according to the requirements of the pyrolysis process; S130: Collecting multiple historical urea pyrolysis ammonia production records, analyzing the historical urea pyrolysis ammonia production records, calculating the historical urea pyrolysis ammonia production deviation coefficient based on the analysis results, and setting an operating strategy of the electric heater according to the historical urea pyrolysis ammonia production deviation coefficient; S140: Separating the produced ammonia and recycling the remaining by-products; S150: collecting real-time operating parameters of the urea pyrolysis device in real time, and judging whether the urea pyrolysis device has safety hazards according to the real-time operating parameters; if so, issuing an alarm.

[0054] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0055] While the present invention has been described above with reference to exemplary embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various features of the disclosed embodiments may be combined with one another in any manner, provided no structural conflicts exist. These combinations are not fully described in this specification for reasons of space and resource conservation.

[0056] Those skilled in the art will understand that the above are merely 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 will still be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A urea pyrolysis ammonia production system, characterized in that: include: a urea storage device, used for dissolving urea in water to obtain a urea solution, and storing the urea solution; a urea distribution device, used to measure the flow rate and concentration of the urea solution and distribute the urea solution according to the requirements of the pyrolysis process; a urea pyrolysis device for collecting a plurality of historical urea pyrolysis ammonia production records, analyzing the historical urea pyrolysis ammonia production records, calculating a historical urea pyrolysis ammonia production deviation coefficient based on the analysis results, and setting an operating strategy of the electric heater according to the historical urea pyrolysis ammonia production deviation coefficient; An ammonia separation device is used to separate the produced ammonia and recycle the remaining by-products; The ammonia monitoring device is used to collect the real-time working parameters of the urea pyrolysis device in real time, and determine whether the urea pyrolysis device has safety hazards based on the real-time working parameters. If so, an alarm is issued.

2. The urea pyrolysis ammonia production system according to claim 1, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to collect the historical actual ammonia production and the historical expected ammonia production corresponding to each historical urea record; The urea pyrolysis device is used to divide the historical urea pyrolysis ammonia production records into historical abnormal urea pyrolysis ammonia production records and historical expected urea pyrolysis ammonia production records according to the relationship between the historical actual ammonia production and the historical expected ammonia production; The urea pyrolysis device is used to extract the historical actual ammonia production and the historical expected ammonia production corresponding to the historical abnormal urea pyrolysis ammonia production record, and fit the historical actual ammonia production curve according to the historical actual ammonia production; The urea pyrolysis device is used to fit a historical expected ammonia production curve according to the historical expected ammonia production; The urea pyrolysis device is used to determine whether the historical actual ammonia production curve and the historical expected ammonia production curve have an intersection, and if not, extract the maximum historical actual ammonia production from all historical expected urea pyrolysis ammonia production records; The urea pyrolysis device is used to respectively calculate the difference between the historical actual ammonia production corresponding to each historical abnormal urea pyrolysis ammonia production record and the maximum historical actual ammonia production; The urea pyrolysis device is used to count the number of historical abnormal urea pyrolysis ammonia production records and the number of historical expected urea pyrolysis ammonia production records; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on the historical actual ammonia production difference, the historical abnormal urea pyrolysis ammonia production record number and the historical expected urea pyrolysis ammonia production record number; The urea pyrolysis device is used to randomly select a curve intersection point as a target curve intersection point, and determine the curve distance from each historical actual ammonia production to the target curve intersection point; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on all curve distances.

3. The urea pyrolysis ammonia production system according to claim 2, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the first historical urea pyrolysis ammonia production deviation coefficient according to the following formula: ； Among them, q1 is the first historical urea pyrolysis ammonia production deviation coefficient calculated based on the historical actual ammonia production difference, the number of historical abnormal urea pyrolysis ammonia production records and the historical expected urea pyrolysis ammonia production records, w1 is the first calculation coefficient, e1 is the number of historical abnormal urea pyrolysis ammonia production records, e2 is the historical expected urea pyrolysis ammonia production records, w2 is the second calculation coefficient, t r is the difference in actual ammonia production in the rth history, t max is the maximum historical actual ammonia production difference.

4. The urea pyrolysis ammonia production system according to claim 3, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the curve distance mean of all curve distances; The urea pyrolysis device is configured to divide the corresponding curve distance into a first curve distance set when the curve distance is less than or equal to the curve distance mean; The urea pyrolysis device is used for dividing the corresponding curve distance into a second curve distance set when the curve distance is greater than the curve distance mean; The urea pyrolysis device is used to calculate a first historical urea pyrolysis ammonia production deviation coefficient based on the first curve distance set and the second curve distance set: ； Among them, q2 is the first historical urea thermal decomposition ammonia production deviation coefficient calculated based on the first curve distance set and the second curve distance set, u is the curve distance mean, p1 is the mean corresponding to the first curve distance set, and p2 is the mean corresponding to the second curve distance set.

5. The urea pyrolysis ammonia production system according to claim 4, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to determine the historical actual ammonia production and the historical actual urea pyrolysis temperature corresponding to each historical abnormal urea pyrolysis ammonia production record; The urea pyrolysis device is used to randomly select a historical abnormal urea pyrolysis ammonia production record and extract the corresponding first historical actual ammonia production and first historical actual urea pyrolysis temperature; The urea pyrolysis device is used to randomly select another historical abnormal urea pyrolysis ammonia production record and extract the corresponding second historical actual ammonia production and second historical actual urea pyrolysis temperature; The urea pyrolysis device is used to calculate a second historical actual ammonia production difference between the first historical actual ammonia production and the second historical actual ammonia production; The urea pyrolysis device is used to extract the maximum historical actual ammonia production and the minimum historical actual ammonia production from all historical abnormal urea pyrolysis ammonia production records, and calculate the historical actual ammonia production range of the maximum historical actual ammonia production and the minimum historical actual ammonia production; The urea pyrolysis device is used to calculate the ratio of the second historical actual ammonia production difference value to the historical actual ammonia production extreme difference value.

6. The urea pyrolysis ammonia production system according to claim 5, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to calculate a second historical actual urea pyrolysis temperature of the first historical actual urea pyrolysis temperature and the second historical actual urea pyrolysis temperature; The urea pyrolysis device is used to extract the maximum historical actual urea pyrolysis temperature and the minimum historical actual urea pyrolysis temperature from all historical abnormal urea pyrolysis ammonia production records, and calculate the historical actual urea pyrolysis temperature range of the maximum historical actual urea pyrolysis temperature and the minimum historical actual urea pyrolysis temperature; The urea pyrolysis device is used to calculate the historical actual urea pyrolysis temperature difference ratio between the second historical actual urea pyrolysis temperature and the historical actual urea pyrolysis temperature extreme difference value; The urea pyrolysis device is used to calculate the product of the historical actual ammonia production difference ratio and the historical actual urea pyrolysis temperature difference ratio as a factor to be calculated; The urea pyrolysis device is used to extract the remaining historical abnormal urea pyrolysis ammonia production records and calculate a plurality of factors to be calculated; The urea pyrolysis device is used to calculate the second historical urea pyrolysis ammonia production deviation coefficient based on all factors to be calculated.

7. The urea pyrolysis ammonia production system according to claim 6, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the second historical urea pyrolysis ammonia production deviation coefficient according to the following formula: ； Among them, s is the second historical urea thermal decomposition ammonia production deviation coefficient, f is the number of factors to be calculated, hi is the i-th factor to be calculated, hmin is the minimum factor to be calculated, hmax is the maximum factor to be calculated, For all The maximum value in .

8. The urea pyrolysis ammonia production system according to claim 7, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to calculate the sum of the first historical urea pyrolysis ammonia production deviation coefficient and the second historical urea pyrolysis ammonia production deviation coefficient, and use the sum as the historical urea pyrolysis ammonia production deviation coefficient.

9. The urea pyrolysis ammonia production system according to claim 1, characterized in that: The urea pyrolysis device is used for: The urea pyrolysis device is used to obtain a current working strategy of the electric heater, wherein the current working strategy includes a current working power of the electric heater; The urea pyrolysis device is used to preset a first preset historical urea pyrolysis ammonia production deviation coefficient and a second preset historical urea pyrolysis ammonia production deviation coefficient; The urea pyrolysis device is used to preset a first preset setting coefficient, a second preset setting coefficient and a third preset setting coefficient; The urea pyrolysis device is configured to calculate a product value of the first preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is less than the first preset historical urea pyrolysis ammonia production deviation coefficient, and use the product value as the current operating strategy of the electric heater; The urea pyrolysis device is configured to calculate a product value of the second preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is greater than or equal to the first preset historical urea pyrolysis ammonia production deviation coefficient and is less than the second preset historical urea pyrolysis ammonia production deviation coefficient, and use the product value as the current operating strategy of the electric heater; The urea pyrolysis device is used to calculate the product value of the third preset setting coefficient and the current operating power when the historical urea pyrolysis ammonia production deviation coefficient is greater than or equal to the second preset historical urea pyrolysis ammonia production deviation coefficient, and use it as the current operating strategy of the electric heater.

10. A method for controlling urea pyrolysis to produce ammonia, applied to the urea pyrolysis to produce ammonia system according to any one of claims 1 to 9, characterized in that: include: dissolving urea in water to obtain a urea solution, and storing the urea solution; Measuring the flow rate and concentration of the urea solution and distributing the urea solution according to the requirements of the pyrolysis process; Collecting multiple historical urea pyrolysis ammonia production records, analyzing the historical urea pyrolysis ammonia production records, calculating the historical urea pyrolysis ammonia production deviation coefficient based on the analysis results, and setting the operating strategy of the electric heater according to the historical urea pyrolysis ammonia production deviation coefficient; Separate the produced ammonia and recycle the remaining by-products; The real-time operating parameters of the urea pyrolysis device are collected in real time, and it is determined whether the urea pyrolysis device has a safety hazard according to the real-time operating parameters. If so, an alarm is issued.

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