Steam turbine inlet steam power optimization device and method

Abstract

The invention relates to a steam turbine inlet steam power optimization device and method. The device comprises a pressure transmitter, a PID (Proportion Integration Differentiation) controller and a pressure regulating valve, and a synthesis gas compressor corresponding to the ammonia synthesis device is connected with a steam main pipe through a synthesis gas compressor steam branch pipe; an ammonia compressor in the ammonia synthesis device is connected with the steam main pipe through an ammonia compressor steam branch pipe; the PID controller is connected with the pressure transmitter; the pressure transmitter is connected with the steam main pipe between the steam branch pipe of the synthesis gas compressor and the steam branch pipe of the ammonia compressor through a pipeline; the pressure regulating valve is arranged on the steam main pipe between the steam branch pipe of the synthesis gas compressor and the steam branch pipe of the ammonia compressor; and the PID controller is electrically connected with the pressure regulating valve. The scheme stabilizes the inlet pressure of the synthesis gas compressor steam turbine.

Description

Technical Field

[0001] This disclosure relates to the field of steam turbine technology, and in particular to a steam turbine inlet steam power optimization device and method. Background Technology

[0002] In related technologies, steam, as the core power source driving the syngas compressor turbine, is crucial for the stability of the production process in coal chemical ammonia synthesis units. However, the medium-pressure steam pipeline at the inlet of the syngas compressor turbine is located at the end of the steam network. Affected by poor coordination of steam production and consumption among multiple units within the coal chemical system, as well as steam transmission resistance and pressure attenuation, frequent fluctuations in network pressure and flow occur. These fluctuations are transmitted to the syngas compressor unit, causing disordered turbine inlet steam parameters, interfering with unit load, and limiting the capacity increase of the ammonia synthesis unit. From the perspective of turbine steam power energy utilization, traditional pipeline layout and control modes cannot effectively buffer and regulate unstable steam input, resulting in low steam power conversion efficiency. This not only affects the continuous and efficient operation of the unit but also restricts the achievement of energy-saving, production-increasing, cost-reducing, and efficiency-enhancing goals in the coal chemical industry. Summary of the Invention To overcome the problems existing in related technologies, this disclosure provides a steam turbine inlet steam power optimization device and method.

[0003] According to a first aspect of the present disclosure, a steam turbine inlet steam power optimization device is provided, comprising a pressure transmitter, a PID controller, and a pressure regulating valve, wherein: The syngas compressor corresponding to the ammonia synthesis unit is connected to the steam header via a syngas compressor steam branch pipe. The ammonia compressor in the ammonia synthesis unit is connected to the steam main pipe via an ammonia compressor steam branch pipe. The PID controller is connected to the pressure transmitter; The pressure transmitter is connected to the steam header between the steam branch pipe of the syngas compressor and the steam branch pipe of the ammonia compressor via a pipeline. The pressure regulating valve is installed on the steam header between the steam branch pipe of the syngas compressor and the steam branch pipe of the ammonia compressor. The PID controller is electrically connected to the pressure regulating valve.

[0004] According to a second aspect of the present disclosure, a method for optimizing steam power at the inlet of a steam turbine is provided, employing the apparatus described in any one of the first aspects, comprising: The control pressure transmitter collects the pressure value in the steam header and sends the pressure value to the PID controller; The stage of the ammonia synthesis unit is determined; the stage includes a first stage and a second stage; the first stage is when the syngas compressor is started up or the ammonia synthesis unit is not in use; the second stage is when both the ammonia synthesis unit and the syngas compressor are in stable use. When the current stage is the first stage, the pressure regulating valve, the first valve and the second valve are fully open, or the first bypass valve is fully open. When the current stage is the second stage, the PID controller is used to determine whether the pressure meets the preset conditions to obtain a first result. Based on the first result, the opening of the pressure regulating valve is controlled so that the pressure inside the steam branch pipe of the synthesis gas compressor falls within the preset pressure range.

[0005] According to a third aspect of the present disclosure, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described in any one of the first aspects.

[0006] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method as described in any one of the first aspects.

[0007] According to a fifth aspect of the present disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the method as described in any one of the first aspects.

[0008] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: the pressure in the steam main pipe of the ammonia synthesis unit is collected by a pressure transmitter, and the collected pressure value is sent to the PID controller. The PID controller adjusts the opening of the pressure regulating valve according to the pressure value, thereby stabilizing the pressure inside the steam branch pipe of the syngas compressor within a preset pressure range. This allows for direct response to pressure fluctuations at the end of the pipeline network, real-time balancing of the steam flow of the syngas compressor steam branch pipe and the ammonia compressor steam branch pipe, stabilizing the inlet pressure of the syngas compressor turbine from the source, and solving the problem of pressure transmission at the end of the steam pipeline network interfering with the unit operation.

[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0011] Figure 1 This is a schematic diagram of the structure of a steam turbine inlet steam power optimization device according to an exemplary embodiment.

[0012] Figure 2 This is a flowchart illustrating a method for optimizing steam power at the inlet of a steam turbine, according to an exemplary embodiment.

[0013] Figure Labels 1. Steam branch pipe of syngas compressor; 2. Steam branch pipe of ammonia compressor; 3. Steam header; 4. PID controller; 5. Pressure transmitter; 6. Pressure regulating valve; 7. Drain valve; 8. First valve; 9. Second valve; 10. First bypass valve; 11. Third valve; 12. Fourth valve; 13. Second bypass valve; 14. Shut-off valve. Detailed Implementation

[0014] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0015] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0016] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the words “if” and “suppose” as used herein may be interpreted as “when”, “when”, or “in response to a determination”.

[0017] Furthermore, various forms of processes shown in the embodiments of this disclosure can be used to reorder, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and no limitation is imposed herein.

[0018] Figure 1This is a schematic diagram illustrating the structure of a steam power optimization device for a steam turbine inlet, according to an exemplary embodiment. (Refer to...) Figure 1 The device includes a pressure transmitter 5, a PID controller 4, and a pressure regulating valve 6.

[0019] The ammonia synthesis unit's syngas compressor is connected to the steam header 3 via syngas compressor steam branch pipe 1; the coal chemical ammonia synthesis unit's ammonia compressor is connected to the steam header 3 via ammonia compressor steam branch pipe 2; the PID controller 4 is connected to the pressure transmitter 5; the pressure transmitter 5 is connected to the steam header 3 between syngas compressor steam branch pipe 1 and ammonia compressor steam branch pipe 2 via a pipeline; the pressure regulating valve 6 is installed on the steam header 3 between syngas compressor steam branch pipe 1 and ammonia compressor steam branch pipe 2; and the PID controller 4 is electrically connected to the pressure regulating valve 6.

[0020] In some embodiments, the waste heat boiler in the ammonia synthesis unit generates 3.4 MPa saturated steam, which is then superheated by the steam superheater to produce 3.4 MPa superheated steam. This superheated steam is then fed into the steam header 3 of the ammonia synthesis unit. The steam header 3 supplies steam to the first turbine driving the synthesis gas compressor through the steam branch pipe 1 of the synthesis gas compressor, and supplies steam to the second turbine driving the ammonia compressor through the steam branch pipe 2 of the ammonia compressor.

[0021] In one embodiment, the pressure transmitter 5 collects the pressure value inside the steam header 3 in real time and sends the collected pressure value to the PID controller 4. The PID controller 4 controls the opening of the pressure regulating valve 6 based on the received pressure value, thereby realizing the dynamic distribution of steam between the steam header 3 and the steam header 1 of the syngas compressor steam branch pipe 1 and the steam header 2 of the ammonia compressor steam branch pipe 2. This achieves dynamic balance of steam flow between the syngas compressor steam branch pipe 1 and the ammonia compressor steam branch pipe 2, stabilizing the inlet pressure of the syngas compressor turbine from the source.

[0022] In some embodiments, a first steam turbine and a second steam turbine are connected to the steam header 3. After steam performs work in the first and second steam turbines, it enters their respective condensers for cooling and condensate recovery. The second steam turbine is located at the end of the steam header 3. The steam pressure at the inlet of this turbine is often too low, affecting the turbine's ability to operate at full capacity. A pressure transmitter 5, a PID controller 4, and a pressure regulating valve 6 can be added between the steam inlet pipes of the first and second steam turbines. That is, the PID controller 4 controls the opening of the pressure in real time based on the pressure collected by the pressure transmitter 5, thereby controlling the steam inlet pressure of the second steam turbine to be stable between 3.4 and 3.5 MPa, ensuring the continuous and efficient operation of the second steam turbine.

[0023] In some embodiments, a shut-off valve 14 is also installed on the pipeline between the pressure transmitter 5 and the steam header 3. The shut-off valve 14 can be used for maintenance, fault isolation, and auxiliary installation and commissioning.

[0024] In some embodiments of this disclosure, the device further includes a steam trap 7, wherein: the input end of the steam trap 7 is connected to the steam header 3 between the pressure transmitter 5 and the pressure regulating valve 6 via a pipeline; and the output end of the steam trap 7 is connected to the outside via a pipeline.

[0025] It should be noted that in a 3.4MPa steam pipeline network, the steam transmission process will generate superheated condensate (liquid water with a temperature exceeding 100℃ and a pressure of 3.4MPa) due to heat dissipation. If the condensate accumulates in the pipeline, the high-speed steam flowing through it will impact the accumulated water, causing a "water hammer" phenomenon (the impact pressure can be several times the normal pressure), which may lead to pipeline vibration, joint leakage, or even equipment rupture.

[0026] Therefore, the steam trap 7 is used to promptly open the valve to drain the condensate, thus avoiding the risk of water hammer at the source. In addition, after the condensate is drained, the steam trap 7 automatically closes the valve to prevent steam from being lost through the drain branch, ensuring the pressure stability of the 3.4MPa steam network, and indirectly assisting the pressure regulating valve 6 in maintaining the turbine inlet pressure within the range of 3.4~3.5MPa.

[0027] Furthermore, while using the PID controller 4 to adjust the opening of the pressure regulating valve 6 according to the pressure value to stabilize the turbine inlet pressure, if there is condensate in the pipeline, the "pressure signal" detected by the pressure transmitter 5 will be affected by the accumulated water (water is much denser than steam, and local water accumulation can lead to falsely high / low pressure). Therefore, using the drain valve 7 to open the valve in time to drain the condensate can reduce the interference of the pressure signal, make the signal collected by the pressure transmitter 5 more accurate, and thus improve the adjustment accuracy of the PID controller.

[0028] In some embodiments, a third valve 11 is installed on the pipeline on one side of the steam trap 7, and a fourth valve 12 is installed on the pipeline on the other side of the steam trap 7. Both the third valve 11 and the fourth valve 12 can be manual valves. The third valve 11 and the fourth valve 12 can be used to control the "on / off" or "coarse flow adjustment" of the pipeline, to cut off the medium or distribute the flow during equipment maintenance or operation condition switching (such as switching between start-up and normal operation).

[0029] In some embodiments, the device further includes a second bypass valve 13, wherein: a first end of the second bypass valve 13 is connected via a pipeline to the pipeline on the side of the third valve 11 away from the drain valve 7; and a second end of the second bypass valve 13 is connected via a pipeline to the pipeline on the side of the second valve 9 away from the drain valve 7.

[0030] In one embodiment, under normal operating conditions, the third valve 11 and the fourth valve 12 can be opened to activate the steam trap 7; if the steam trap 7 fails, the third valve 11 and the fourth valve 12 are closed and the system switches to the second bypass valve 13.

[0031] In some embodiments of this disclosure, the device further includes a first valve 8 and a second valve 9, wherein: the first valve 8 is installed on the steam header 3 near the inlet side of the pressure regulating valve 6; and the second valve 9 is installed on the steam header 3 near the outlet side of the pressure regulating valve 6.

[0032] In one embodiment, both the first valve 8 and the second valve 9 can be manual valves.

[0033] In one embodiment, the first valve 8 and the second valve 9 can be used to control the "on / off" or "coarse flow adjustment" of the pipeline, to cut off the medium or distribute the flow during equipment maintenance or operation mode switching (such as switching between start-up and normal operation).

[0034] In some embodiments of this disclosure, the apparatus further includes a first bypass valve 10, wherein: a first end of the first bypass valve 10 is connected via a pipeline to a steam header 3 on the side of the first valve 8 away from the pressure regulating valve 6; and a second end of the first bypass valve 10 is connected via a pipeline to a steam header 3 on the side of the second valve 9 away from the pressure regulating valve 6.

[0035] In one embodiment, under normal operating conditions, the first valve 8 and the second valve 9 can be opened to activate automatic pressure regulation (that is, the PID controller 4 adjusts the opening of the pressure regulating valve 6 according to the pressure value); when the regulating valve fails, the first valve 8 and the second valve 9 are closed, and the system switches to the bypass manual valve (that is, the first bypass valve 10 mentioned above).

[0036] According to the turbine inlet steam power optimization device proposed in this embodiment, the pressure in the steam header of the ammonia synthesis unit is collected by a pressure transmitter, and the collected pressure value is sent to a PID controller. The PID controller adjusts the opening of the pressure regulating valve according to the pressure value, thereby stabilizing the pressure inside the steam branch of the syngas compressor within a preset pressure range. This allows for direct response to pressure fluctuations at the end of the pipeline network, and real-time balancing of the steam flow in the steam branch of the syngas compressor and the steam branch of the ammonia compressor. This stabilizes the turbine inlet pressure of the syngas compressor from the source and solves the problem of pressure transmission at the end of the steam pipeline network interfering with the unit operation.

[0037] Figure 2 This is a flowchart illustrating a method for optimizing steam power at the inlet of a steam turbine, according to an exemplary embodiment. Figure 2 As shown, it should be noted that the turbine inlet steam power optimization method of this disclosure embodiment is applied in a turbine inlet steam power optimization device. For example... Figure 2 As shown, the method may include the following steps: Step 201: Control the pressure transmitter 5 to collect the pressure value in the steam header 3 and send the pressure value to the PID controller 4.

[0038] Step 202: Determine the stage of the coal chemical ammonia synthesis unit.

[0039] The stage includes the first stage and the second stage; the first stage is when the syngas compressor is started up or the ammonia synthesis unit is not in use; the second stage is when both the ammonia synthesis unit and the syngas compressor are in stable use.

[0040] It should be noted that both the ammonia synthesis unit and the syngas compressor are in stable operation, meaning that the ammonia synthesis unit is able to produce ammonia steadily, and the syngas compressor is able to operate at a stable load continuously.

[0041] It should be noted that during the first stage, before the ammonia synthesis unit is put into operation, steam is used for single-unit compressor commissioning, resulting in large fluctuations in flow and pressure. During startup, as various devices are gradually put into operation, steam demand may experience sudden increases. The syngas compressor may be in low-load trial operation or speed-up commissioning, and its steam pressure demand is also dynamically changing. Therefore, it is necessary to fully release excess pressure in the pipeline network by adjusting the valve opening and closing to ensure safety during the startup phase. In the second stage, both the ammonia synthesis unit and the syngas compressor are stably put into operation, and the pressure fluctuation amplitude is reduced, meeting the conditions for the PID controller to dynamically adjust steam flow and accurately stabilize pressure.

[0042] Step 203: If the current stage is the first stage, control the pressure regulating valve 6, the first valve 8 and the second valve 9 to be fully open, or control the first bypass valve 10 to be fully open.

[0043] Step 204: In the case of the second stage, the PID controller 4 is used to determine whether the pressure meets the preset conditions and obtain the first result. Based on the first result, the opening of the pressure regulating valve 6 is controlled so that the pressure inside the steam branch pipe 1 of the synthesis gas compressor falls into the preset pressure range.

[0044] In one embodiment of this application, during the first stage of starting up the syngas compressor or when the ammonia synthesis unit is not yet in use, the steam consumption is low because the unit is not fully operational. If the pressure regulating valve is closed, the main pipe pressure may rise sharply, damaging the pipeline or equipment. Therefore, the pressure regulating valve 6, the first valve 8, and the second valve 9 can be fully opened. If the steam pressure still tends to rise, the valve positions of the first valve 8 and the second valve can be set to 100%, or the first bypass valve 10 can be opened directly. PID automatic regulation is temporarily not enabled to fully release excess pressure in the pipeline network and ensure safety during the start-up phase.

[0045] In another embodiment of this application, in the second stage where both the ammonia synthesis unit and the syngas compressor are stably put into use, the PID controller 4 is used to determine whether the pressure meets the preset conditions and obtain a first result. Based on the first result, the opening of the pressure regulating valve 6 is controlled, thereby realizing the dynamic distribution of steam in the steam header 3 between the syngas compressor steam branch pipe 1 and the ammonia compressor steam branch pipe 2 and the steam in the syngas compressor steam branch pipe 1. This achieves the dynamic balance of steam flow between the syngas compressor steam branch pipe 1 and the ammonia compressor steam branch pipe 2, stabilizing the inlet pressure of the syngas compressor turbine from the source.

[0046] In some embodiments of this disclosure, step 204 may specifically include the following steps: If the first result is that the pressure value is greater than the first threshold, the opening of the control pressure regulating valve 6 is adjusted to the first preset opening, so that part of the steam in the steam branch pipe 1 of the synthesis gas compressor is diverted to the steam main pipe 3; If the first result is that the pressure value is less than the second threshold, the opening of the control pressure regulating valve 6 is adjusted to the second preset opening so that part of the steam in the steam header 3 is supplied to the steam branch pipe 1 of the synthesis gas compressor; the first preset opening is greater than the second preset opening; the second threshold is less than or equal to the first threshold.

[0047] In some embodiments of this disclosure, the first threshold is 3.5 MPa and the second threshold is 3.4 MPa.

[0048] In one embodiment, if the pressure value is greater than 3.5 MPa, the opening of the pressure regulating valve 6 is adjusted to the first preset opening (that is, the opening of the pressure regulating valve 6 is increased) so that the excess steam in the steam branch pipe 1 of the syngas compressor is diverted to the steam header 3, thereby reducing the pressure of the steam branch pipe 1 of the syngas compressor; if the pressure value is less than 3.4 MPa, the opening of the pressure regulating valve 6 is adjusted to the second preset opening (that is, the opening of the pressure regulating valve 6 is decreased) so that some of the steam in the steam header 3 is replenished to the steam branch pipe 1 of the syngas compressor, thereby increasing the pressure of the steam branch pipe 1 of the syngas compressor.

[0049] In some embodiments of this disclosure, the method may further include the following steps: Control the steam trap 7 to open so that the condensate generated during steam transfer can be discharged to the outside; After the condensate is drained to the outside, control the steam trap 7 to close.

[0050] In this embodiment, a steam trap 7 is used to promptly open and drain condensate, preventing water hammer risk at the source. Furthermore, after the condensate is drained, the steam trap 7 automatically closes to prevent steam loss through the drain branch, ensuring stable pressure in the 3.4MPa steam network. This indirectly assists the pressure regulating valve 6 in maintaining the turbine inlet pressure within the 3.4~3.5MPa range. It also reduces interference from condensate on the pressure signal, making the signal acquired by the pressure transmitter 5 more accurate, thereby improving the regulation accuracy of the PID controller.

[0051] In some embodiments of this disclosure, the method may further include the following steps: Obtain the rotational speed of the syngas compressor; If the rotational speed is greater than the preset speed, control the syngas compressor to reduce the rotational speed so that the rotational speed is less than or equal to the preset speed.

[0052] In one embodiment, a sensor can be used to collect the rotational speed of the syngas compressor in real time. If the rotational speed is greater than a preset speed, the syngas compressor can be controlled to reduce its rotational speed so that the rotational speed is less than or equal to the preset speed.

[0053] It should be noted that the speed interlock (i.e., controlling the syngas compressor to be less than or equal to the preset speed) and the control of the pressure inside the syngas compressor steam branch pipe 1 are complementary safety mechanisms. The pressure inside the syngas compressor steam branch pipe 1 reduces speed fluctuations from the source by stabilizing the steam pressure. If the pressure regulation fails, the speed interlock directly limits the speed to ensure equipment safety.

[0054] According to the turbine inlet steam power optimization method proposed in this disclosure, the pressure in the steam header of the ammonia synthesis unit is collected by a pressure transmitter, and the collected pressure value is sent to a PID controller. The PID controller adjusts the opening of the pressure regulating valve according to the pressure value, thereby stabilizing the pressure inside the steam branch of the syngas compressor within a preset pressure range. This allows for direct response to pressure fluctuations at the end of the pipeline network, real-time balancing of the steam flow in the steam branch of the syngas compressor and the steam branch of the ammonia compressor, stabilizing the turbine inlet pressure of the syngas compressor from the source, and solving the problem of pressure transmission at the end of the steam pipeline network interfering with unit operation.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0058] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A steam turbine inlet steam power optimization device, characterized by, The pressure transmitter, the PID controller and the pressure regulating valve are connected through the steam main pipe. The ammonia synthesis device is connected with the steam main pipe through a steam branch pipe of a synthesis gas compressor. The ammonia compressor in the ammonia synthesis device is connected with the steam main pipe through an ammonia compressor steam branch pipe. The PID controller is connected with the pressure transmitter. The pressure transmitter is connected with the steam main pipe between the steam branch pipe of the synthesis gas compressor and the steam branch pipe of the ammonia compressor. The pressure regulating valve is installed on the steam main pipe between the steam branch pipe of the synthesis gas compressor and the steam branch pipe of the ammonia compressor. The PID controller is electrically connected with the pressure regulating valve.

2. The steam turbine inlet steam power optimizing arrangement of claim 1, wherein, The drain valve is further included, wherein: The input end of the drain valve is connected with the steam main pipe between the pressure transmitter and the pressure regulating valve through a pipeline. The output end of the drain valve is connected with the outside through a pipeline.

3. The steam turbine inlet steam power optimizing arrangement of claim 1, wherein, The first valve and the second valve are further included, wherein: The first valve is installed on the steam main pipe close to the inlet side of the pressure regulating valve. The second valve is installed on the steam main pipe close to the outlet side of the pressure regulating valve.

4. The steam turbine inlet steam power optimizing arrangement of claim 3, wherein, The first bypass valve is further included, wherein: The first end of the first bypass valve is connected with the steam main pipe on the side away from the pressure regulating valve of the first valve through a pipeline. The second end of the first bypass valve is connected with the steam main pipe on the side away from the pressure regulating valve of the second valve through a pipeline.

5. A method for steam turbine inlet steam power optimization, using the device according to any one of claims 1 to 4, characterized in that, The pressure transmitter is controlled to collect the pressure value in the steam main pipe and send the pressure value to the PID controller. The stage of the ammonia synthesis device is determined. The stage includes a first stage and a second stage. The first stage is that the synthesis gas compressor is started or the ammonia synthesis device is not put into use. The second stage is that the ammonia synthesis device and the synthesis gas compressor are both stably put into use. When the stage is the first stage, the pressure regulating valve, the first valve and the second valve are controlled to be fully opened, or the first bypass valve is controlled to be fully opened.

6. The steam turbine inlet steam power optimization method of claim 5, wherein, When the stage is the second stage, the PID controller is used to determine whether the pressure meets the preset condition to obtain a first result, and the opening degree of the pressure regulating valve is controlled based on the first result so that the pressure in the synthesis gas compressor steam branch pipe falls within a preset pressure interval range. The control of the opening degree of the pressure regulating valve based on the first result so that the pressure in the synthesis gas compressor steam branch pipe falls within a preset pressure interval range includes: When the first result is that the pressure value is greater than a first threshold value, the opening degree of the pressure regulating valve is adjusted to a first preset opening degree so that part of the steam in the synthesis gas compressor steam branch pipe is diverted to the steam main pipe. When the first result is that the pressure value is less than a second threshold value, the opening degree of the pressure regulating valve is adjusted to a second preset opening degree so that part of the steam in the steam main pipe is supplemented to the synthesis gas compressor steam branch pipe; the first preset opening degree is greater than the second preset opening degree; and the second threshold value is less than or equal to the first threshold value.

7. The steam turbine inlet steam power optimization method of claim 6, wherein, The first threshold value is 3.5 MPa, and the second threshold value is 3.4 MPa.

8. The steam turbine inlet steam power optimization method of claim 5, wherein, Further comprising: controlling the opening of the trap valve to discharge the condensed water generated in the steam transmission process to the outside; controlling the trap valve to close after the condensed water is discharged to the outside.

9. The steam turbine inlet steam power optimization method of claim 5, wherein, Further comprising: acquiring the rotating speed of the syngas compressor; controlling the syngas compressor to reduce the rotating speed so that the rotating speed is less than or equal to the preset rotating speed if the rotating speed is greater than the preset rotating speed.

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