A device for preventing simulation quantity feedback over-temperature aging of power plant steam extraction check valve

Abstract

The application provides a device for preventing simulation quantity feedback over-temperature aging of a power plant steam extraction check valve, relates to the technical field of valves, and comprises a valve clack fixing base, a valve clack rotating shaft rotatably arranged on the valve clack fixing base, a first extended rotating shaft connected to the valve clack rotating shaft through a lock, a second extended rotating shaft rotatably arranged on one side of a rotation sensor, and a heat insulation fixing support fixedly arranged between the valve clack fixing base and the rotation sensor. The heat insulation fixing support reduces the operation environment temperature of the rotation sensor, reduces the failure rate of the simulation quantity rotation sensor, enables the simulation quantity feedback of the valve to measure the real-time opening of the valve through the rotation sensor, and feeds back the simulation quantity signal change of the opening to a control system in real time, so that accurate flow control or specific process conditions are realized, and normal and safe operation of a thermal power generating unit is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a device for preventing over-temperature aging of analog quantity feedback of a power plant steam extraction check valve. BACKGROUND

[0002] The steam extraction check valve of the coal-fired thermal power unit turbine is widely used in the steam extraction system of the thermal power plant turbine and other occasions requiring medium backflow prevention, such as the high-pressure cylinder exhaust pipe, the steam extraction pipe, etc. Its core function is to protect important equipment such as the turbine, the heater and the pipe from damage caused by medium backflow. When steam or water and other media attempt to backflow under certain conditions, the steam extraction check valve will quickly close to effectively block the backflow path and ensure the safe operation of the system.

[0003] At present, the analog quantity feedback of the steam extraction check valve uses a TXP type rotary sensor to measure the rotation angle of the valve flap in the open and closed states of the valve, and the actual opening of the check valve is fed back. Since the analog quantity feedback of the 1000 MW thermal power unit steam extraction check valve uses a TXP type rotary sensor for measurement, the rotary sensor and the rotating shaft of the valve flap must be installed on the same center line. The existing rotary sensor must be installed close to the rotating shaft of the valve flap, which results in excessively high ambient temperature during the operation of the rotary sensor, high failure rate of the rotary sensor and shortened service life.

[0004] Therefore, in view of the above status, it is urgent to develop a device for preventing over-temperature aging of analog quantity feedback of a power plant steam extraction check valve, so as to overcome the deficiencies in the current actual application. SUMMARY

[0005] The present application provides a device for preventing over-temperature aging of analog quantity feedback of a power plant steam extraction check valve to solve the defects in the prior art.

[0006] The present application provides a device for preventing over-temperature aging of analog quantity feedback of a power plant steam extraction check valve, comprising: a valve flap fixing base, a valve flap rotating shaft is rotatably arranged on the valve flap fixing base, a first extended rotating shaft is connected to the valve flap rotating shaft through a lock, a second extended rotating shaft is rotatably arranged on one side of the rotary sensor, the first extended rotating shaft is fixedly connected with the second extended rotating shaft through a lock, and a heat insulation fixing bracket is fixedly arranged between the valve flap fixing base and the rotary sensor.

[0007] Preferably, it further comprises:

[0008] A data acquisition module is arranged in the steam extraction check valve to monitor the sensor and collect the parameters of the steam extraction check valve in real time.

[0009] A demand analysis module is arranged to analyze the demand parameters input by the user.

[0010] The parameter adjustment module is configured to continuously detect parameters of the steam extraction check valve and adjust the opening degree of the steam extraction check valve according to the demand.

[0011] The early warning module one is configured to perform early warning when the parameters of the steam extraction check valve are greater than or equal to the demand parameters input by the user.

[0012] Preferably, the monitoring sensor includes a rotation sensor, a temperature sensor, a pressure sensor and a flow sensor.

[0013] Preferably, the demand analysis module includes:

[0014] The feature acquisition unit is configured to extract a plurality of initial features from the demand parameters input by the user and analyze the initial features to obtain a plurality of key features.

[0015] The model construction unit is configured to determine a demand prediction model in a preset feature type-model database based on the feature types of the key features, and then establish the demand prediction model.

[0016] The demand acquisition unit is configured to input the real-time collected user demand parameters into the demand prediction model, and then obtain a plurality of user demands.

[0017] Preferably, the demand parameters input by the user include steam flow demand in the steam extraction check valve, pressure demand in the steam extraction check valve, temperature demand of the steam extraction check valve and operation time characteristic demand of the steam extraction check valve.

[0018] Preferably, the parameter adjustment module includes:

[0019] The coefficient determination unit one is configured to determine a gas supply change coefficient of each time period based on the user demand.

[0020] The coefficient determination unit two is configured to determine a temperature change coefficient based on the gas supply change coefficient.

[0021] The grade division unit is configured to divide the user into a plurality of demand grades based on the steam flow demand of the user and a preset grading method.

[0022] The parameter acquisition unit is configured to obtain the opening and closing range and the sensitivity of each type of steam extraction check valve based on a preset operation manual.

[0023] The parameter setting unit is configured to set the opening and closing range and the sensitivity of the corresponding check valve based on the demand grade of each user and the opening and closing range and the sensitivity of each type of steam extraction check valve.

[0024] The early warning module two is configured to perform early warning when the temperature change coefficient is greater than a preset temperature change coefficient.

[0025] The adjusting control unit adjusts the opening of the steam extraction check valve according to the adjusting strategy based on the steam supply coefficient of each time period, the temperature change coefficient, the demand level of each user, and the opening and closing range and sensitivity of each steam extraction check valve.

[0026] Preferably, the coefficient determination unit one comprises:

[0027] The steam extraction check valve internal steam supply change coefficient of each time period is determined based on the steam flow demand of the user, the steam pressure demand of the user, and the time characteristic demand of the user.

[0028]

[0029] Wherein, j is the steam extraction check valve internal steam supply change coefficient, C m is the steam flow coefficient at the minimum relative opening, C d is the steam flow coefficient at the maximum relative opening, γ is the steam expansion coefficient, P1 is the pressure before the steam extraction check valve internal steam supply, P2 is the pressure after the steam extraction check valve internal steam supply, W1 is the preset maximum flow demand, W2 is the preset minimum flow demand, μ is the compression coefficient of the steam passing through the steam extraction check valve, ε is the resistance coefficient of the steam extraction check valve, and ρ is the density of the steam in the steam extraction check valve.

[0030] Preferably, the coefficient determination unit two comprises:

[0031]

[0032] Wherein, N is the temperature change coefficient of the steam extraction check valve, b is the turbulent flow flux, s is the movement distance of the steam in the steam extraction check valve, δ is the viscosity coefficient, and β is the diffusion coefficient. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] Figure 1 is the overall structure schematic diagram provided by the embodiment of the present application.

[0035] Reference signs:

[0036] 1, valve clack fixed base; 2, valve clack rotating shaft; 3, first extension rotating shaft; 4, lock; 5, second extension rotating shaft; 6, rotating sensor; 7, heat insulation fixed support. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and does not mean to specially indicate the order or sequence, nor to limit the present application, but only to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on that the combination of technical solutions can be realized by those of ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0039] The present application provides the following embodiments

[0040] Embodiment 1

[0041] The embodiment of the present application provides a device for preventing over-temperature aging of analog quantity feedback of power plant steam extraction check valve, as shown in Figure 1 The valve clack fixing base 1 is provided with a valve clack rotating shaft 2 rotatingly on it, a first extended rotating shaft 3 is connected to the valve clack rotating shaft 2 through a lock 4, a second extended rotating shaft 5 is provided rotatingly on one side of a rotation sensor 6, the first extended rotating shaft 3 is fixedly connected with the second extended rotating shaft 5 through the lock 4, and a heat insulation fixed support 7 is fixedly arranged between the valve clack fixing base 1 and the rotation sensor 6.

[0042] The working principle and beneficial effects of the technical scheme are as follows: the valve clack fixed base 1 rotates and supports the valve clack rotating shaft 2, the lock 4 synchronously rotates and connects the valve clack rotating shaft 2 and the first extended rotating shaft 3, the lock 4 also synchronously rotates and connects the first extended rotating shaft 3 and the second extended rotating shaft 5, the heat insulation fixed support 7 fixedly connects the valve clack fixed base 1 and the rotation sensor 6, increases the stability of the valve clack fixed base 1 and the rotation sensor 6 without affecting the synchronous rotation of the valve clack rotating shaft 2, the first extended rotating shaft 3 and the second extended rotating shaft 5, the heat insulation fixed support 7 also reduces heat conduction, reduces the operating environment temperature of the rotation sensor 6, reduces the failure rate of the analog rotation sensor 6, prolongs the service life, enables the analog feedback of the valve to measure the real-time opening of the valve through the rotation sensor 6, and feeds back the analog signal change of the opening to the control system in real time, the control system adjusts the opening or other control parameters of the valve according to the feedback signal, so as to realize accurate flow control or maintain specific process conditions, and enables the running monitoring personnel to monitor the running state of the extraction check valve, so that the running personnel can respond to the change of system parameters in time and perform corresponding operation under abnormal working conditions, and ensure the normal and safe operation of the thermal power generating unit.

[0043] Embodiment 2

[0044] On the basis of embodiment 1, further comprising:

[0045] The data acquisition module installs a monitoring sensor in the extraction check valve, and is used for collecting parameters of the extraction check valve in real time.

[0046] The demand analysis module analyzes the demand parameters input by the user, the parameter adjustment module continuously detects the parameters of the extraction check valve, and adjusts the opening of the extraction check valve according to the demand.

[0047] The early warning module one early warns when the parameters of the extraction check valve are greater than or equal to the demand parameters input by the user.

[0048] In this embodiment, the parameters of the extraction check valve include real-time rotation amount, temperature, pressure intensity, flow size and other data of the extraction check valve.

[0049] In this embodiment, the opening adjustment of the extraction check valve is to adjust the opening of the extraction check valve according to the real-time analysis result.

[0050] The working principle and beneficial effects of the technical scheme are: the data acquisition module includes collecting the temperature, pressure and flow in the steam extraction check valve, which is used to collect the real-time parameters of the steam extraction check valve in real time, the demand analysis module is used to analyze the demand parameters input by the user, the parameter adjustment module refers to continuously detecting the parameters of the steam extraction check valve, and adjusting the opening of the steam extraction check valve according to the demand, the early warning module one, when the parameters of the steam extraction check valve are greater than or equal to the demand parameters input by the user, the early warning is performed, the real-time parameters of the steam extraction check valve are acquired through the data acquisition module, the opening of the steam extraction check valve is adjusted through the demand analysis of the user, so as to adjust the heating efficiency in the steam extraction check valve, the comparison between the continuous monitoring and the demand input by the user is performed, so as to monitor and warn, and the flexibility and safety of the steam extraction check valve are enhanced, and the normal and safe operation of the thermal power generating unit is ensured.

[0051] Embodiment 3

[0052] On the basis of embodiment 2, the monitoring sensor includes: a rotation sensor 6, a temperature sensor, a pressure sensor and a flow sensor.

[0053] In this embodiment, the rotation sensor 6 is used to detect the real-time opening degree in the steam extraction check valve.

[0054] In this embodiment, the pressure sensor is used to detect the fluid pressure in the steam extraction check valve. By monitoring the pressure change in real time, the safety of the heating system can be ensured, and the failure caused by overpressure or underpressure can be prevented. At the same time, the pressure data can help analyze the flow state of the pipeline and optimize the flow efficiency of the heat medium.

[0055] In this embodiment, the temperature sensor is used to detect the temperature of the steam in and out of the steam extraction check valve. These data are helpful for evaluating the heating effect and the thermal efficiency of the system. By comparing the temperature of the steam in and out, it can be judged whether the heating demand of the user is met, and adjustment can be made if necessary.

[0056] In this embodiment, the flow sensor is used to measure the steam flow through the steam extraction check valve. The flow data are the key parameters for understanding the actual heating situation of the user end, which are helpful for timely adjusting the steam extraction check valve to meet the demand of the user and optimize the system operation. By monitoring the flow, the efficient distribution of heat energy can be ensured, and energy waste can be reduced.

[0057] The working principle and beneficial effects of the technical scheme are: the rotation sensor 6 detects the opening of the steam extraction check valve, the temperature sensor detects the temperature of the steam extraction check valve, the pressure sensor detects the pressure of the steam extraction check valve, and the flow sensor detects the flow in the steam extraction check valve, so as to provide the required parameters for each module.

[0058] Embodiment 4

[0059] Based on Embodiment 3, the demand analysis module includes:

[0060] Feature extraction unit: extracts several initial features from user input demand parameters and analyzes the initial features to obtain several key features;

[0061] Model construction unit: determines the demand prediction model in the preset feature type-model database based on the feature type of the key features, and then establishes the demand prediction model;

[0062] Demand acquisition unit: inputs the real-time collected user demand parameters into the demand prediction model, and then acquires several user demands.

[0063] In this embodiment, the initial features are raw data extracted from user-side parameters, including: user heat: such as the total heat consumption of the user in a certain period of time, environmental temperature: the outside temperature affects the user's heat demand, time period information: such as the user's heat usage in different time periods (morning, afternoon, evening) in a day;

[0064] In this embodiment, the key features are features that are extracted from the initial features and are considered to have an important influence on user demand after analysis. For example: peak heat: the maximum heat demand of the user in the high demand period, temperature difference: the case where the temperature difference between the inlet and outlet water is large, which may indicate that the user's heat demand is changing, historical heat usage pattern: the user's heat usage behavior pattern in the past few days or weeks, which helps to predict future demand.

[0065] In this embodiment, the preset feature type-model database is a system that contains various feature types and their corresponding models. For example: temperature feature: the corresponding model may be a linear model based on regression analysis, flow feature: there can be a prediction model based on time series analysis, comprehensive feature: a complex model established by machine learning algorithms (such as random forest or neural network) can be used.

[0066] In this embodiment, the demand prediction model is a model established based on key features and historical data, which is used to predict the user's future heat demand. For example: linear regression model: uses historical heat data and environmental temperature to establish a linear relationship between user demand and these factors, time series model: analyzes the seasonal and periodic fluctuations of user historical heat data to predict future demand, machine learning model: uses complex algorithms such as random forest, support vector machine, etc., to make predictions based on multi-dimensional features, improving accuracy.

[0067] The working principle and beneficial effects of the technical solution are as follows: the feature acquisition unit extracts a plurality of initial features from the demand parameters input by the user, analyzes the initial features to obtain a plurality of key features, the model construction unit determines a demand prediction model in a preset feature type-model database based on the feature types of the key features, and then establishes the demand prediction model; the demand acquisition unit inputs the real-time collected user demand parameters into the demand prediction model, and then obtains a plurality of user demands.

[0068] Embodiment 5

[0069] On the basis of embodiment 4, the demand parameters input by the user include: steam flow demand in the steam extraction check valve, pressure demand in the steam extraction check valve, temperature demand of the steam extraction check valve, and operation time characteristic demand of the steam extraction check valve.

[0070] The working principle and beneficial effects of the technical solution are as follows: the demand parameters input by the user include: steam flow demand in the steam extraction check valve, pressure demand in the steam extraction check valve, temperature demand of the steam extraction check valve, and operation time characteristic demand of the steam extraction check valve.

[0071] Embodiment 6

[0072] On the basis of embodiment 5, the parameter adjustment module includes:

[0073] The coefficient determination unit one: determines the gas supply change coefficient of each time period based on the user demand;

[0074] The coefficient determination unit two: determines the temperature change coefficient based on the gas supply change coefficient;

[0075] The grade division unit: divides the user into a plurality of demand grades based on the steam flow demand of the user and a preset grading method;

[0076] The parameter acquisition unit: acquires the opening and closing range and sensitivity of each type of steam extraction check valve based on a preset operation manual;

[0077] The parameter setting unit: sets the opening and closing range and sensitivity of the corresponding steam extraction check valve based on the demand grade of each user and the opening and closing range and sensitivity of each type of steam extraction check valve;

[0078] The early warning module two: performs early warning when the temperature change coefficient is greater than a preset temperature change coefficient;

[0079] The adjustment control unit: adjusts the opening of the steam extraction check valve based on the steam supply coefficient of each time period, the temperature change coefficient, the demand grade of each user, and the opening and closing range and sensitivity of each steam extraction check valve to determine the adjustment strategy.

[0080] The preset grading method in the embodiment refers to a set of standards and rules for classifying users according to steam flow requirements and time characteristic requirements of the users in a user-closed steam trap control system.

[0081] The working principle and beneficial effects of the technical solution are as follows:

[0082] The coefficient determination unit one determines the gas supply change coefficient of each time period based on user requirements, and the coefficient determination unit two determines the temperature change coefficient based on the gas supply change coefficient;

[0083] The grade division unit divides the users into several demand grades based on steam flow requirements of the users and the preset grading method;

[0084] The parameter acquisition unit acquires the opening and closing range and sensitivity of each type of steam trap valve based on a preset operation manual;

[0085] The parameter setting unit sets the opening and closing range and sensitivity of the corresponding steam trap valve based on the demand grade of each user and the opening and closing range and sensitivity of each type of steam trap valve;

[0086] The early warning module two performs early warning when the temperature change coefficient is greater than a preset temperature change coefficient;

[0087] The adjustment control unit adjusts the opening of the steam trap valve based on the steam supply coefficient of each time period, the temperature change coefficient, the demand grade of each user, and the opening and closing range and sensitivity of each steam trap valve to determine an adjustment strategy.

[0088] Embodiment 7

[0089] On the basis of embodiment 6, the coefficient determination unit one includes:

[0090] The gas supply change coefficient of each time period in the steam trap valve is determined based on steam flow requirements of the user, steam pressure requirements of the user, and time characteristic requirements of the user:

[0091]

[0092] wherein j is the gas supply change coefficient in the steam trap valve, C m is the steam flow coefficient at the minimum relative opening, C d is the steam flow coefficient at the maximum relative opening, γ is the steam expansion coefficient, P1 is the pressure before the gas supply in the steam trap valve, P2 is the pressure after the gas supply in the steam trap valve, W1 is a preset maximum flow requirement, W2 is a preset minimum flow requirement, μ is the compression coefficient of the steam passing through the steam trap valve, ε is the resistance coefficient of the steam trap valve, and ρ is the density of the steam in the steam trap valve.

[0093] The working principle and beneficial effects of the technical solution are that The temperature change coefficient of the steam extraction check valve is calculated, and the temperature change coefficient is determined based on the steam supply change coefficient.

[0094] Embodiment 8

[0095] Based on the embodiment 7, the coefficient determination unit two comprises:

[0096]

[0097] Wherein, N is the temperature change coefficient of the steam extraction check valve, b is the turbulent flux, s is the movement distance of the steam in the steam extraction check valve, δ is the viscosity coefficient, and β is the diffusion coefficient.

[0098] The working principle and beneficial effects of the technical solution are that The temperature change coefficient of the steam extraction check valve is calculated, and the temperature change coefficient is compared with the preset rated temperature change coefficient, when the temperature change coefficient of the steam extraction check valve is greater than or equal to the rated temperature change coefficient, the use performance of the steam extraction check valve has a problem, when the temperature change coefficient of the steam extraction check valve is less than the rated temperature change coefficient, the use performance of the steam extraction check valve is normal, and the steam extraction check valve and the rotation sensor arranged thereon continue to be used, so that the thermal energy management is realized.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for preventing over-temperature aging of analog feedback of a power plant extraction steam check valve, characterized in that, The utility model relates to a steam extraction check valve, including: The valve clack fixed base is provided with a valve clack rotating shaft on the rotation, and the first extension rotating shaft is connected with the second extension rotating shaft through the lock on the valve clack rotating shaft, and the first extension rotating shaft is fixedly connected with the second extension rotating shaft through the lock, and the heat insulation fixed support is fixed between the valve clack fixed base and the rotation sensor; Also including: Data acquisition module, installs monitoring sensor, is used for real -time collection steam extraction check valve's parameter; Demand analysis module is used for analyzing the demand parameter of user input; Parameter adjustment module is used for the parameter of steam extraction check valve to carry out continuous detection to the opening of steam extraction check valve and is adjusted according to demand; Early warning module one, when the parameter of steam extraction check valve is greater than or equal to the demand parameter of user input, early warning; Demand analysis module includes: Feature acquisition unit: extract several initial features from the demand parameter of user input, and analyze the initial feature and obtain several key features; Model construction unit: determine demand prediction model in the preset feature type-model database based on the feature type of key feature, and then establish demand prediction model; Demand acquisition unit: input the user demand parameter collected in real time into demand prediction model, and then obtain several user demands; Parameter adjustment module includes: Coefficient determination unit one: determine the gas supply change coefficient of each time period based on user demand; Coefficient determination unit two: determine the temperature change coefficient based on the gas supply change coefficient; Grade division unit: based on the steam flow demand of user and the preset grading method, the user is divided into several demand grades; Parameter acquisition unit: based on the preset operation manual, the opening and closing range and sensitivity of each type of check valve are obtained; Parameter setting unit: based on the demand grade of each user and the opening and closing range and sensitivity of each type of check valve, the opening and closing range and sensitivity of corresponding check valve are set; Early warning module two, when the temperature change coefficient is greater than the preset temperature change coefficient, early warning; Adjustment control unit: based on the steam supply coefficient of each time period, the temperature change coefficient, the demand grade of each user, the opening and closing range and sensitivity of each check valve, the adjustment strategy is determined to adjust the opening of check valve.

2. The device for preventing the simulation quantity feedback over-temperature aging of the extraction check valve of the power plant according to claim 1, characterized in that, Monitoring sensor includes: rotation sensor, temperature sensor, pressure sensor, flow sensor.

3. The device for preventing the simulation quantity feedback over-temperature aging of the extraction check valve of the power plant according to claim 2, characterized in that, The demand parameter of user input includes: steam flow demand in check valve, pressure demand in check valve, check valve temperature demand, operation time characteristic demand of check valve.

Images