Automatic adjustment device for inlet steam of liquid ammonia evaporator

Abstract

The present application relates to the technical field of automation control, in particular to a kind of liquid ammonia evaporator inlet steam automatic adjusting device. Including: steam chamber, steam chamber is equipped with steam regulating valve, steam chamber is provided with electric heating device, the upper portion of steam chamber is provided with steam outlet pipeline;Evaporator is also provided with steam inlet, pressure sensor is arranged on steam inlet, and pressure sensor is used to detect the pressure at steam inlet;PLC automatic control system, PLC automatic control system is electrically connected with pressure sensor and electric heating device, and PLC automatic control system is used to automatically control the heating power of electric heating device and the steam flow at steam inlet according to the pressure F at steam inlet detected by pressure sensor.The present application can effectively realize the automatic regulation of the pressure and flow of inlet steam, to avoid waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automation control, in particular to a liquid ammonia evaporator inlet steam automatic adjusting device. BACKGROUND

[0002] Evaporation is a physical process of converting liquid into gas. Generally speaking, an evaporator is an object that converts liquid into gas. There are a large number of evaporators in industry, among which evaporators applied to refrigeration systems are one of them. The evaporator is a very important component in the four major components of refrigeration. The low-temperature condensed liquid passes through the evaporator and exchanges heat with the air outside, absorbs heat to vaporize, and achieves the effect of refrigeration. The evaporator mainly consists of two parts: a heating chamber and an evaporation chamber. The heating chamber provides heat to the liquid to promote boiling and vaporization; the evaporation chamber completely separates the gas and liquid phases.

[0003] The principle of the evaporator is to use evaporation to heat the solution, so that part of the solvent in the solution vaporizes and is removed, thereby increasing the concentration of the solution, i.e. the process of concentrating the solution. The equipment used for evaporation operation is called an evaporator. Since the solution to be evaporated is mostly water solution, the evaporation process is to use water vapor as a heating agent to produce water vapor. In order to distinguish, the water vapor as a heat source is called heating steam or primary steam, and the steam vaporized from the solution is called secondary steam. However, in the prior art, the liquid ammonia evaporator inlet steam cannot be automatically adjusted according to the liquid ammonia evaporation amount, resulting in waste of steam, and thus causing certain resource consumption and increasing the cost. Therefore, how to provide a liquid ammonia evaporator inlet steam automatic adjusting device is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0004] The purpose of the present application is to provide a liquid ammonia evaporator inlet steam automatic adjusting device. By using the liquid ammonia evaporator inlet steam automatic adjusting device of the present application, the pressure and flow rate of the inlet steam can be automatically adjusted, and waste can be avoided.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical solution:

[0006] A liquid ammonia evaporator inlet steam automatic adjusting device, comprising:

[0007] A steam chamber is provided with a steam regulating valve, an electric heating device is arranged in the steam chamber, and a steam outlet pipeline is arranged at the upper part of the steam chamber; a steam inlet is further arranged in the evaporator, a pressure sensor is arranged on the steam inlet, and the pressure sensor is used to detect the pressure at the steam inlet;

[0008] A PLC automatic control system is electrically connected with the pressure sensor and the electric heating device, and is configured to automatically control the heating power of the electric heating device and the steam flow at the steam inlet according to the pressure F detected by the pressure sensor.

[0009] In some embodiments of the present application, a preset steam pressure matrix T0 and a preset heating power matrix A are set in the PLC automatic control system, wherein A (A1, A2, A3, A4) is set for the preset heating power matrix A, A1 is a first preset heating power, A2 is a second preset heating power, A3 is a third preset heating power, A4 is a fourth preset heating power, and A1

[0010] T0 (T01, T02, T03, T04) is set for the preset steam pressure matrix T0, T01 is a first preset steam pressure, T02 is a second preset steam pressure, T03 is a third preset steam pressure, T04 is a fourth preset steam pressure, and T01

[0011] The PLC automatic control system is configured to select a corresponding heating power as the heating power of the electric heating device according to the relationship between F and the preset steam pressure matrix T0;

[0012] When F

[0013] When T01

[0014] When T02

[0015] When T03

[0016] In some embodiments of the present application, a preset steam flow matrix B is also set in the PLC automatic control system, wherein B (B1, B2, B3, B4) is set for the preset steam flow matrix B, B1 is a first preset steam flow, B2 is a second preset steam flow, B3 is a third preset steam flow, B4 is a fourth preset steam flow, and B1

[0017] The PLC automatic control system is further configured to select a corresponding steam flow through the steam regulating valve according to a relationship between F and the preset steam pressure matrix T0 to adjust the steam flow at the steam inlet in real time.

[0018] When F

[0019] When T01

[0020] When T02

[0021] When T03

[0022] In some embodiments of the present application, the PLC automatic control system is further configured to set a preset automatic control signal matrix Q0 and a preset steam regulating valve opening degree matrix C. For the preset steam regulating valve opening degree matrix C, C(C1, C2, C3, C4) is set, wherein C1 is a first preset steam regulating valve opening degree, C2 is a second preset steam regulating valve opening degree, C3 is a third preset steam regulating valve opening degree, and C4 is a fourth preset steam regulating valve opening degree, and 0% < C1 < C2 < C3 < C4 ≤ 100%.

[0023] For the preset automatic control signal matrix Q0, Q0(Q01, Q02, Q03, Q04) is set, wherein Q01 is a first preset automatic control signal, Q02 is a second preset automatic control signal, Q03 is a third preset automatic control signal, and Q04 is a fourth preset automatic control signal, and 8mA < Q01 < Q02 < Q03 < Q04 < 16mA.

[0024] The PLC automatic control system is further configured to output an automatic control signal according to each preset steam flow, and select a corresponding steam regulating valve opening degree as the opening degree of the steam regulating valve according to each preset automatic control signal.

[0025] When the first preset steam flow B1 is selected, the first preset automatic control signal Q01 is selected, and the first preset steam regulating valve opening degree C1 is selected as the opening degree of the steam regulating valve according to the first preset automatic control signal Q01.

[0026] When the second preset steam flow B2 is selected, the second preset automatic control signal Q02 is selected, and the second preset steam regulating valve opening degree C2 is selected as the opening degree of the steam regulating valve according to the second preset automatic control signal Q02;

[0027] When the third preset steam flow B3 is selected, the third preset automatic control signal Q03 is selected, and the third preset steam regulating valve opening degree C3 is selected as the opening degree of the steam regulating valve according to the third preset automatic control signal Q03;

[0028] When the fourth preset steam flow B4 is selected, the fourth preset automatic control signal Q04 is selected, and the fourth preset steam regulating valve opening degree C4 is selected as the opening degree of the steam regulating valve according to the fourth preset automatic control signal Q04.

[0029] In some embodiments of the present application, further comprising:

[0030] A steam utilization device, comprising a header and a plurality of steam pipes, one end of the header being connected with the plurality of steam pipes.

[0031] In some embodiments of the present application, the steam utilization device is a liquid ammonia heat exchanger, and the steam pipes are used for heating liquid ammonia.

[0032] In some embodiments of the present application, the header further comprises a monitor for detecting the mass G of the liquid in the header.

[0033] In some embodiments of the present application, the PLC automatic control system further comprises a preset header liquid mass matrix V0 and a preset steam flow correction coefficient matrix D, wherein D(D1, D2, D3, D4), D1 is a first preset steam flow correction coefficient, D2 is a second preset steam flow correction coefficient, D3 is a third preset steam flow correction coefficient, D4 is a fourth preset steam flow correction coefficient, and 1

[0034] The preset header liquid mass matrix V0 is V0(V01, V02, V03, V04), wherein V01 is a first preset header liquid mass, V02 is a second preset header liquid mass, V03 is a third preset header liquid mass, and V04 is a fourth preset header liquid mass, and V01

[0035] The PLC automatic control system is also used for selecting a corresponding steam flow correction coefficient according to a relationship between G and the preset liquid mass matrix V0 in the header to correct the steam flow and take the steam flow at the steam inlet as the steam flow;

[0036] When G is less than V01, the first preset steam flow correction coefficient D1 is selected to correct the steam flow and take the steam flow at the steam inlet as the steam flow, and the corrected steam flow is B1*D1.

[0037] When V01 is less than or equal to G and less than V02, the second preset steam flow correction coefficient D2 is selected to correct the steam flow and take the steam flow at the steam inlet as the steam flow, and the corrected steam flow is B2*D3.

[0038] When V02 is less than or equal to G and less than V03, the third preset steam flow correction coefficient D3 is selected to correct the steam flow and take the steam flow at the steam inlet as the steam flow, and the corrected steam flow is B3*D3.

[0039] When V03 is less than or equal to G and less than V04, the fourth preset steam flow correction coefficient D4 is selected to correct the steam flow and take the steam flow at the steam inlet as the steam flow, and the corrected steam flow is B4*D4.

[0040] In some embodiments of the present application, the steam regulating valve is driven by a driving motor.

[0041] In some embodiments of the present application, the pressure sensor is a plurality of pressure sensors.

[0042] The liquid ammonia evaporator inlet steam automatic adjustment device provided by the present application has the following beneficial effects compared with the prior art:

[0043] The present application adds a steam regulating valve and a pressure sensor to the steam chamber, and applies a PLC automatic control system to automatically control the heating power and the steam flow at the steam inlet according to the pressure detected by the pressure sensor. The PLC automatic control system automatically adjusts and controls the heating power according to the steam pressure, and the steam regulating valve is driven by a motor to adjust the opening angle of the regulating valve in real time according to different control signals output by the PLC. The device is completely independent of the traditional manual adjustment method, realizes full automatic control of the device, and has real-time adjustment. The device can effectively realize automatic adjustment of the pressure and flow of the inlet steam, avoid waste, and has the advantages of automation, accuracy, and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a structural schematic view of the liquid ammonia evaporator inlet steam automatic adjustment device of the present application.

[0045] Figure 2 is a structural schematic diagram of a steam utilization device of the present application.

[0046] In the figure: 101, steam chamber; 102, steam regulating valve; 103, electric heating device; 104, steam outlet pipeline; 105, steam inlet; 106, pressure sensor; 107, PLC automatic control system; 108, driving motor; 201, header; 202, steam pipe; 203, monitor. DETAILED DESCRIPTION

[0047] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0048] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] The terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0050] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The working principle of the evaporator: by using the evaporation method, after heating the solution, part of the solvent in the solution is vaporized and removed, thereby increasing the concentration of the solution, that is, the process of concentrating the solution. The equipment for performing the evaporation operation is called an evaporator. Since the solution to be evaporated is mostly an aqueous solution, the evaporation process is to use water vapor as a heating agent to generate water vapor. In order to facilitate the distinction, the water vapor as the heat source is called heating steam or primary steam, and the steam vaporized from the solution is called secondary steam.

[0052] PLC automatic control system: a digital electronic device with a microprocessor for automatic control of digital logic controller, control instructions can be loaded into memory at any time storage and run. Programmable controller is modularized by internal CPU, instruction and data storage, input and output unit, power module, digital analog unit, etc. PLC can receive and send various types of electrical or electronic signals, and use them to control or supervise almost all kinds of mechanical and electrical systems.

[0053] Referring to Figure 1 The embodiment provides a kind of liquid ammonia evaporator entrance steam automatic adjusting device, including:

[0054] Steam chamber, steam chamber is equipped with steam regulating valve, electric heating device is arranged in steam chamber, the upper portion of steam chamber is provided with steam outlet pipeline;Evaporator is also provided with steam inlet, pressure sensor is arranged on steam inlet, and pressure sensor is used to detect the pressure at steam inlet;

[0055] PLC automatic control system, PLC automatic control system is electrically connected with pressure sensor and electric heating device, and PLC automatic control system is used to automatically control the heating power of electric heating device and the steam flow at steam inlet according to the pressure F at steam inlet detected by pressure sensor.

[0056] In a specific embodiment of the present application, a preset steam pressure matrix T0 and a preset heating power matrix A are set in the PLC automatic control system.For the preset heating power matrix A, set A (A1, A2, A3, A4), wherein A1 is the first preset heating power, A2 is the second preset heating power, A3 is the third preset heating power, and A4 is the fourth preset heating power, and A1

[0057] For the preset steam pressure matrix T0, set T0 (T01, T02, T03, T04), wherein T01 is the first preset steam pressure, T02 is the second preset steam pressure, T03 is the third preset steam pressure, and T04 is the fourth preset steam pressure, and T01

[0058] The PLC automatic control system is configured to select a corresponding heating power as the heating power of the electric heating device according to the relationship between F and a preset steam pressure matrix T0;

[0059] When F < T01, a fourth preset heating power A4 is selected as the heating power of the electric heating device;

[0060] When T01≤F < T02, a third preset heating power A3 is selected as the heating power of the electric heating device;

[0061] When T02≤F < T03, a second preset heating power A2 is selected as the heating power of the electric heating device;

[0062] When T03≤F < T04, a first preset heating power A1 is selected as the heating power of the electric heating device.

[0063] In a specific embodiment of the present application, a preset steam flow matrix B is further set in the PLC automatic control system, for the preset steam flow matrix B, B (B1, B2, B3, B4) is set, wherein B1 is a first preset steam flow, B2 is a second preset steam flow, B3 is a third preset steam flow, and B4 is a fourth preset steam flow, and B1 < B2 < B3 < B4;

[0064] The PLC automatic control system is further configured to select a corresponding steam flow through a steam regulating valve to adjust the steam flow at the steam inlet in real time according to the relationship between F and the preset steam pressure matrix T0;

[0065] When F < T01, a first preset steam flow B1 is selected to pass through the steam regulating valve to adjust the steam flow at the steam inlet in real time;

[0066] When T01≤F < T02, a second preset steam flow B2 is selected to pass through the steam regulating valve to adjust the steam flow at the steam inlet in real time;

[0067] When T02≤F < T03, a third preset steam flow B3 is selected to pass through the steam regulating valve to adjust the steam flow at the steam inlet in real time;

[0068] When T03≤F < T04, a fourth preset steam flow B4 is selected to pass through the steam regulating valve to adjust the steam flow at the steam inlet in real time.

[0069] In an embodiment of the present application, the PLC automatic control system further comprises a preset automatic control signal matrix Q0 and a preset steam regulating valve opening degree matrix C. For the preset steam regulating valve opening degree matrix C, C(C1, C2, C3, C4) is set, wherein C1 is a first preset steam regulating valve opening degree, C2 is a second preset steam regulating valve opening degree, C3 is a third preset steam regulating valve opening degree, and C4 is a fourth preset steam regulating valve opening degree, and 0% < C1 < C2 < C3 < C4 ≤ 100%;

[0070] For the preset automatic control signal matrix Q0, Q0(Q01, Q02, Q03, Q04) is set, wherein Q01 is a first preset automatic control signal, Q02 is a second preset automatic control signal, Q03 is a third preset automatic control signal, and Q04 is a fourth preset automatic control signal, and 8mA < Q01 < Q02 < Q03 < Q04 < 16mA;

[0071] The PLC automatic control system is further configured to output an automatic control signal according to each preset steam flow, and select a corresponding steam regulating valve opening degree as the opening degree of the steam regulating valve according to each preset automatic control signal.

[0072] When the first preset steam flow B1 is selected, the first preset automatic control signal Q01 is selected, and the first preset steam regulating valve opening degree C1 is selected as the opening degree of the steam regulating valve according to the first preset automatic control signal Q01.

[0073] When the second preset steam flow B2 is selected, the second preset automatic control signal Q02 is selected, and the second preset steam regulating valve opening degree C2 is selected as the opening degree of the steam regulating valve according to the second preset automatic control signal Q02.

[0074] When the third preset steam flow B3 is selected, the third preset automatic control signal Q03 is selected, and the third preset steam regulating valve opening degree C3 is selected as the opening degree of the steam regulating valve according to the third preset automatic control signal Q03.

[0075] When the fourth preset steam flow B4 is selected, the fourth preset automatic control signal Q04 is selected, and the fourth preset steam regulating valve opening degree C4 is selected as the opening degree of the steam regulating valve according to the fourth preset automatic control signal Q04.

[0076] In an embodiment of the present application, the PLC automatic control system further comprises:

[0077] The steam utilization device comprises a header and steam pipes, and one end of the header is connected with the steam pipes.

[0078] In an embodiment of the present application, the steam utilization device is a liquid ammonia heat exchanger, and the steam pipes are used for heating liquid ammonia.

[0079] In an embodiment of the present application, the header tank is further provided with a monitor for detecting the mass G of the liquid in the header tank.

[0080] In an embodiment of the present application, the PLC automatic control system is further provided with a preset header tank liquid mass matrix V0 and a preset steam flow correction coefficient matrix D. For the preset steam flow correction coefficient matrix D, D (D1, D2, D3, D4) is set, wherein D1 is a first preset steam flow correction coefficient, D2 is a second preset steam flow correction coefficient, D3 is a third preset steam flow correction coefficient, and D4 is a fourth preset steam flow correction coefficient, and 1 < D1 < D2 < D3 < D4 < 2.

[0081] For the preset header tank liquid mass matrix V0, V0 (V01, V02, V03, V04) is set, wherein V01 is a first preset header tank liquid mass, V02 is a second preset header tank liquid mass, V03 is a third preset header tank liquid mass, and V04 is a fourth preset header tank liquid mass, and V01 < V02 < V03 < V04.

[0082] The PLC automatic control system is further configured to select a corresponding steam flow correction coefficient according to the relationship between G and the preset header tank liquid mass matrix V0 to correct the steam flow and serve as the steam flow at the steam inlet.

[0083] When G < V01, the first preset steam flow correction coefficient D1 is selected to correct the steam flow and serve as the steam flow at the steam inlet, and the corrected steam flow is B1 * D1.

[0084] When V01 ≤ G < V02, the second preset steam flow correction coefficient D2 is selected to correct the steam flow and serve as the steam flow at the steam inlet, and the corrected steam flow is B2 * D3.

[0085] When V02 ≤ G < V03, the third preset steam flow correction coefficient D3 is selected to correct the steam flow and serve as the steam flow at the steam inlet, and the corrected steam flow is B3 * D3.

[0086] When V03 ≤ G < V04, the fourth preset steam flow correction coefficient D4 is selected to correct the steam flow and serve as the steam flow at the steam inlet, and the corrected steam flow is B4 * D4.

[0087] In an embodiment of the present application, the steam regulating valve is driven by a driving motor.

[0088] In an embodiment of the present application, the pressure sensor is a plurality of pressure sensors.

[0089] In summary, the application adds a steam regulating valve and a pressure sensor to the steam chamber, and applies a PLC automatic control system to automatically control the heating power and the steam flow at the steam inlet according to the pressure detected by the pressure sensor, the PLC automatic control system automatically adjusts the heating power according to the steam pressure, and the motor drives the steam regulating valve to adjust the opening angle of the regulating valve in real time according to different control signals output by the PLC, which completely eliminates the need for traditional manual adjustment, realizes full automation control of the device, and has real-time adjustment, which can effectively realize automatic adjustment of the pressure and flow of the inlet steam, avoid waste, and the automatic adjustment device provided by the application has the advantages of automation, accuracy, and high efficiency.

[0090] The above is only one embodiment of the application, but cannot limit the scope of the application, and any structural changes made according to the application, as long as the essence of the application is not lost, should be considered to fall within the scope of the application and be restricted.

[0091] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process and related description of the system described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0092] It should be noted that the system provided in the above embodiments is only exemplified by the division of the above functional modules, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the modules or steps in the embodiments of the application can be further divided or combined, for example, the modules of the above embodiments can be combined into one module, or further split into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the application are only for distinguishing the modules and steps, and should not be considered as an improper limitation of the application.

[0093] Those skilled in the art should clearly understand that the modules and method steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. The programs corresponding to the software modules and method steps can be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a DD-ROM or any other form of storage medium known in the art. In order to clearly illustrate the interchangeability of electronic hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are performed by electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0094] The term "comprising" or any other similar word is intended to encompass a non-exclusive inclusion, so that a process, method, article or equipment / device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to the process, method, article or equipment / device.

[0095] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art should easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after such changes or replacements will all fall within the protection scope of the present application.

[0096] The above description is only for the preferred embodiments of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A liquid ammonia evaporator inlet vapor automatic adjustment device, characterized in that, It comprises: a steam chamber provided with a steam regulating valve, an electric heating device arranged in the steam chamber, and a steam outlet pipeline arranged at the upper part of the steam chamber; a steam inlet is further arranged in the evaporator, and a pressure sensor is arranged on the steam inlet to detect the pressure at the steam inlet; a PLC automatic control system electrically connected with the pressure sensor and the electric heating device, and used to automatically control the heating power of the electric heating device and the steam flow at the steam inlet according to the pressure at the steam inlet detected by the pressure sensor; a steam utilization device comprising a header and a plurality of steam pipes connected with the header; a monitor arranged in the header to detect the mass G of the liquid in the header; a preset header liquid mass matrix V0 and a preset steam flow correction coefficient matrix D are further set in the PLC automatic control system, wherein D(D1, D2, D3, D4) is set for the preset steam flow correction coefficient matrix D, wherein D1 is a first preset steam flow correction coefficient, D2 is a second preset steam flow correction coefficient, D3 is a third preset steam flow correction coefficient, and D4 is a fourth preset steam flow correction coefficient, and 1 V0(V01, V02, V03, V04) is set for the preset header liquid mass matrix V0, wherein V01 is a first preset header liquid mass, V02 is a second preset header liquid mass, V03 is a third preset header liquid mass, and V04 is a fourth preset header liquid mass, and V01 The PLC automatic control system is further used to select a corresponding steam flow correction coefficient according to the relationship between G and the preset header liquid mass matrix V0 to correct the steam flow as the steam flow at the steam inlet; When G When V01≤G When V02≤G When V03≤G When V03≤G 2. The liquid ammonia evaporator inlet steam automatic adjusting device according to claim 1, characterized in that, The PLC automatic control system is internally provided with a preset steam pressure matrix T0 and a preset heating power matrix A. For the preset heating power matrix A, A (A1, A2, A3, A4) is set, wherein A1 is a first preset heating power, A2 is a second preset heating power, A3 is a third preset heating power, and A4 is a fourth preset heating power, and A1 For the preset steam pressure matrix T0, T0 (T01, T02, T03, T04) is set, wherein T01 is a first preset steam pressure, T02 is a second preset steam pressure, T03 is a third preset steam pressure, and T04 is a fourth preset steam pressure, and T01 The PLC automatic control system is used to select a corresponding heating power as the heating power of the electric heating device according to the relationship between F and the preset steam pressure matrix T0; When F < T01, the fourth preset heating power A4 is selected as the heating power of the electric heating device; When T01 ≤ F < T02, the third preset heating power A3 is selected as the heating power of the electric heating device; When T02 ≤ F < T03, the second preset heating power A2 is selected as the heating power of the electric heating device; When T03 ≤ F < T04, the first preset heating power A1 is selected as the heating power of the electric heating device.

3. The liquid ammonia evaporator inlet steam automatic adjustment device according to claim 2, wherein The PLC automatic control system is internally provided with a preset steam pressure matrix T0 and a preset heating power matrix A. For the preset heating power matrix A, A (A1, A2, A3, A4) is set, wherein A1 is a first preset heating power, A2 is a second preset heating power, A3 is a third preset heating power, and A4 is a fourth preset heating power, and A1 The PLC automatic control system is used to select a corresponding heating power as the heating power of the electric heating device according to the relationship between F and the preset steam pressure matrix T0; When F < T01, the fourth preset heating power A4 is selected as the heating power of the electric heating device; When T01 ≤ F < T02, the third preset heating power A3 is selected as the heating power of the electric heating device; When T02 ≤ F < T03, the second preset heating power A2 is selected as the heating power of the electric heating device; When T03 ≤ F < T04, the first preset heating power A1 is selected as the heating power of the electric heating device.

4. The liquid ammonia evaporator inlet steam automatic adjustment device according to claim 3, wherein The PLC automatic control system is further provided with a preset automatic control signal matrix Q0 and a preset steam regulating valve opening degree matrix C. For the preset steam regulating valve opening degree matrix C, C (C1, C2, C3, C4) is set, wherein C1 is the first preset steam regulating valve opening degree, C2 is the second preset steam regulating valve opening degree, C3 is the third preset steam regulating valve opening degree, and C4 is the fourth preset steam regulating valve opening degree, and 0% < C1 < C2 < C3 < C4 ≤ 100%. For the preset automatic control signal matrix Q0, Q0 (Q01, Q02, Q03, Q04) is set, wherein Q01 is the first preset automatic control signal, Q02 is the second preset automatic control signal, Q03 is the third preset automatic control signal, and Q04 is the fourth preset automatic control signal, and 8mA < Q01 < Q02 < Q03 < Q04 < 16mA. The PLC automatic control system is further used for outputting automatic control signals according to the preset steam flow, and selecting the steam regulating valve opening degree according to the preset automatic control signal. When the first preset steam flow B1 is selected, the first preset automatic control signal Q01 is selected, and the first preset steam regulating valve opening degree C1 is selected as the opening degree of the steam regulating valve according to the first preset automatic control signal Q01. When the second preset steam flow B2 is selected, the second preset automatic control signal Q02 is selected, and the second preset steam regulating valve opening degree C2 is selected as the opening degree of the steam regulating valve according to the second preset automatic control signal Q02. When the third preset steam flow B3 is selected, the third preset automatic control signal Q03 is selected, and the third preset steam regulating valve opening degree C3 is selected as the opening degree of the steam regulating valve according to the third preset automatic control signal Q03. When the fourth preset steam flow B4 is selected, the fourth preset automatic control signal Q04 is selected, and the fourth preset steam regulating valve opening degree C4 is selected as the opening degree of the steam regulating valve according to the fourth preset automatic control signal Q04.

5. The liquid ammonia evaporator inlet steam automatic adjusting device according to claim 1, wherein the steam utilization equipment is a liquid ammonia heat exchanger, and the steam pipe is used for heating liquid ammonia.

6. The liquid ammonia evaporator inlet steam automatic adjusting device according to claim 1, wherein the steam regulating valve is driven by a driving motor.

7. The liquid ammonia evaporator inlet steam automatic adjusting device according to claim 1, wherein the pressure sensor is a plurality of pressure sensors. ​ ​ ​

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