Pneumatic control valve vibration stabilizing system based on throttling regulation and control

Abstract

The utility model relates to the technical field of coke oven equipment, and discloses a pneumatic control valve vibration stabilizing system based on throttling regulation and control, which comprises an ascending pipe arranged on the oven top, the ascending pipe is connected with an elbow through a tee joint, the upper section of the elbow is provided with a pressure transmitter which is in signal connection with a control system, and the tail end of the elbow is provided with a water-sealed valve. The device is characterized in that the water-sealed valve is driven by an air cylinder connected with an instrument compressed air, the instrument compressed air is connected with a power air source input end of a valve positioner, the valve positioner is in signal connection with a control system, and an air pressure output end of the valve positioner is connected with an air inlet of the air cylinder through two air inlet pipes; the two air inlet pipes are respectively provided with an adjustable one-way steam valve, or an adjustable throttling silencer is arranged on an exhaust port of the valve positioner; piston rods of the cylinders are connected with the water-sealed valves.

Description

TECHNICAL FIELD

[0001] The utility model relates to coke oven equipment technical field, especially a kind of pneumatic valve positioning adjusting device, specifically a kind of pneumatic regulating valve vibration stabilization system based on throttling control. BACKGROUND

[0002] In the production process of coke oven, in order to improve the balance of coke oven system pressure, ensure that the internal pressure of coke oven can guarantee the micro-positive pressure of carbonization chamber bottom in different coking period, ensure the service life of coke oven, double-acting pneumatic water seal adjusting device is installed in the riser of coke oven, to accurately adjust the pressure of coke oven carbonization chamber, the pressure control of carbonization chamber riser plays a decisive role in the safe operation of carbonization chamber, and the gas of riser is also collected into gas collector, and the pressure of downstream gas collector needs to be balanced, to play the role of preceding and subsequent.

[0003] And the number of water seal valves of each pipe of existing coke oven is large, and the oscillation in the adjusting process affects the mutual coupling of gas collection system, especially the greatest influence on the pressure control of the furnace, and the device generates oscillation in use, the oscillation of adjusting device not only causes the imbalance of system, but also causes the riser to smoke when out of control; Carbonization chamber bottom negative pressure, external air enters carbonization chamber, makes part of coke burn, causes high ash content of coke, and the ash produced after burning erodes the furnace wall at high temperature, causing damage to the furnace body; Influence the pressure balance of gas collector; Cause water seal valve to be closed by mistake when valve opening is small, cause coke oven to smoke, affect clean production of coke oven.

[0004] To solve the problem of oscillation of pneumatic valve positioning adjusting device, test must be carried out in the coking period of each furnace of coke oven. Because of high temperature of coke oven, dense equipment arrangement and small construction space, each coking period is more than 26 hours, and observation needs to be carried out many times in the whole coking period, and adjustment needs to be carried out after the coking period of the furnace, under the condition of not affecting production.

[0005] The following methods have been tried to solve the problem:

[0006] 1, all existing positioners are re-set, but the oscillation problem cannot be solved;

[0007] 2, the counterweight of water seal valve is adjusted, and the balance point is not easy to find;

[0008] 3, contact the professional technicians of positioner, analyze and propose that the adjustment precision of piezoelectric positioning type is too high, and it is not easy to handle the fine adjustment of adverse working conditions, propose to use nozzle type positioner, replace different principle positioner, re-make installation base, buy nozzle type positioner, and the trial effect is not good;

[0009] The application aims to solve the oscillation problem of the pneumatic valve positioning adjusting device, and provides a stable vibration system with minimum investment, high cost performance and effectiveness. Utility model content

[0010] The utility model discloses in order to solve the oscillation of the pneumatic regulating valve positioner of coke oven body system in the prior art, the mutual coupling influence of the gas collecting system, finally influence the pressure control of system and a series of problems, provide a kind of stable vibration system of pneumatic regulating valve based on throttling control.

[0011] The utility model provides a kind of stable vibration system of pneumatic regulating valve based on throttling control, including the riser pipe of installation on furnace top, riser pipe passes through tee bend, pressure transmitter of signal connection control system is installed in the upper section of bend, the end of bend is equipped with water seal valve, it is characterized by: water seal valve is driven by the air cylinder of connecting instrument pressure empty, instrument pressure empty connects the power gas source input end of valve positioner, valve positioner is connected with control system signal, and the output gas pressure end of valve positioner is connected the gas inlet of air cylinder by two gas inlet pipes;Two gas inlet pipes are each equipped with adjustable one-way steam valve, or adjustable throttle muffler is installed on the exhaust port of valve positioner;The piston rod of air cylinder is connected water seal valve.

[0012] When implementing, including the riser pipe of installation on furnace top, riser pipe passes through tee bend, pressure transmitter of signal connection control system is installed in the upper section of bend, the end of bend is equipped with water seal valve, water seal valve is driven by the air cylinder of connecting instrument pressure empty, instrument pressure empty connects the power gas source input end of valve positioner, valve positioner is electric-gas valve positioner, accurately control the switch position of pneumatic valve by receiving control signal and converting into pneumatic control signal, valve positioner is connected with control system signal, and 4-20mA control signal is received, and valve positioner exports compressed air from instrument pressure empty to air cylinder as power source to control air cylinder, continues to control the switch of valve by the movement and stillness of air cylinder;Air filter pressure reducing valve is installed on the gas source pipeline between instrument pressure empty and valve positioner, and pressure reducing valve is used to stabilize gas source pressure, avoids the output instability caused by pressure fluctuation, and the output gas pressure end of valve positioner is connected the gas inlet of air cylinder by two gas inlet pipes, and balance valve is crossed between two gas inlet pipes, and adjustable one-way steam valve is installed on two gas inlet pipes respectively, and the piston rod of air cylinder is connected water seal valve.

[0013] As the second solution, when implemented, it includes an ascending pipe installed on the top of the furnace, the ascending pipe is connected with a three-way elbow, the upper section of the elbow is installed with a pressure transmitter connected with the signal control system, the end of the elbow is installed with a water seal valve, the water seal valve is driven by a cylinder connected with instrument air, the instrument air is connected with the power source input end of a valve positioner, the valve positioner is an electric-gas valve positioner, which accurately controls the opening and closing position of the pneumatic valve by receiving control signals and converting them into pneumatic control signals, the valve positioner is connected with the control system signal, receiving 4-20mA control signals, an air filter and pressure reducing valve is installed on the air source pipeline between the instrument air and the valve positioner, an adjustable throttle muffler is installed on the exhaust port of the valve positioner, the output air pressure end of the valve positioner is connected with the air inlet of the cylinder through two air inlet pipes, a balance valve is connected between the two air inlet pipes, and the piston rod of the cylinder is connected with the water seal valve.

[0014] The working principle of the system is as follows:

[0015] The valve positioner receives signal input from the controller or PLC or DCS, the signal input comes from various sensors or other measuring devices, accurately reflecting the opening and closing position and state of the valve, converting electrical signals into precise pneumatic signal output, matching the position of the valve with the control command.

[0016] The working process of the pneumatic valve positioner adjusting device is signal receiving-input processing-driver action-valve position feedback-position comparison and adjustment-stable operation. In the whole working process, the pneumatic valve positioner closely cooperates with the control system to achieve precise positioning of the pneumatic valve through accurate control, thus meeting the needs of the production process.

[0017] 1. Input signal receiving and processing.

[0018] Input signal receiving and processing: the pneumatic valve positioner receives the output signal from the control system or automatic instrument as the control signal, which reflects the control demand of the production process or the set value of the operator on the valve. This signal is usually an electrical signal, such as current signal or voltage signal. After receiving the signal, the internal circuit of the positioner will perform preliminary processing on the signal, including amplification, conversion and linearization processing, etc., to ensure the stability and accuracy of the signal. Signal amplification is to ensure that the subsequent execution link can accurately respond to weak input signals; the conversion process is to convert the electrical signal into a form that the pneumatic actuator can understand; linearization processing is to ensure that the position of the valve and the control signal present a linear relationship, thus ensuring control accuracy. Through these processing steps, the positioner converts external control commands into instructions that internal control logic can understand and execute, preparing for the next step of valve position control.

[0019] 2. Signal conversion and execution.

[0020] Signal conversion and execution are the core steps of the pneumatic valve positioner. After receiving the standardized electrical signal (usually 4-20mA current signal) from the control room, the positioner begins to perform a series of conversion and execution actions. The signal processing unit inside the positioner will convert the received electrical signal into pneumatic signal, and this conversion process relies on the electronic components and amplifiers inside the positioner. These pneumatic signals are transmitted to the pneumatic actuator, such as air cylinder or air film components. After receiving the signal, the pneumatic actuator will perform corresponding actions according to the strength and direction of the signal, driving the valve stem to open or close. The accurate position of the valve is determined and maintained by the positioner and the actuator, ensuring that the valve can accurately respond to the signal instructions from the control room. The positioner also has feedback function, which can feedback the real-time position information of the valve to the control system, forming a closed-loop control system to achieve more accurate and stable control effect.

[0021] 3. Valve position feedback and adjustment.

[0022] In the working principle of pneumatic valve positioner, the feedback and adjustment of valve position is a core link. The positioner receives feedback signals from the valve to understand the actual position of the valve. This feedback mechanism usually relies on the valve position sensor, which can detect the opening of the valve and transmit the corresponding electrical signal to the positioner.

[0023] When the feedback signal received by the valve positioner is compared with the set target value, there will be a difference, which is the positioning error. In order to correct this error, the valve positioner will calculate the necessary adjustment signal according to the control algorithm, and drive the valve to adjust the position through the pneumatic actuator. This adjustment process is usually automatic to ensure accurate positioning of the valve.

[0024] In this process, the valve positioner has the ability to control the speed of valve movement. When the valve approaches the target position, the valve positioner will adjust its movement speed to avoid sudden opening and closing actions, ensuring the stability and accuracy of the valve positioning process. However, if the instruction and feedback movement speed control is not proper during the execution of the valve positioner, it may cause oscillation during the adjustment process, affecting the adjustment effect.

[0025] This device limits the air intake flow of the cylinder by installing an adjustable one-way steam valve, reduces the movement speed of the cylinder piston, slows down the pressure change rate, avoids the phase difference between the control signal and the feedback signal, and avoids the oscillation caused by the system response overshoot, thus forming a stable oscillation system for the pneumatic regulating valve.

[0026] The device is provided with an adjustable throttling muffler installed at the exhaust port of the valve positioner, which slows down the exhaust speed by increasing the exhaust back pressure, and the muffler delays the release speed of the air pressure during the exhaust stage, thereby assisting in controlling the movement speed, reducing the shock caused by the sudden change of pressure, and making the adjustment movement of the valve positioner more stable by reducing the rapid movement of the cylinder or air film, thereby eliminating high-frequency shock and forming a vibration damping system of the pneumatic control valve.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The pneumatic control valve vibration damping system based on throttling regulation provided by the utility model solves the problem of vibration of the pneumatic control valve by installing an adjustable one-way steam valve at the air inlet of the cylinder or installing an adjustable throttling muffler at the exhaust port of the valve positioner, and the operation of replacement is simple, and the adjustable range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic view of the utility model embodiment 1.

[0030] Figure 2 It is a schematic view of the utility model embodiment 2.

[0031] Figure 3 It is a schematic view of the installation position of the utility model in the coke oven.

[0032] The following marks are marked in the figure: 1-instrument air, 2-air filter pressure reducing valve, 3-valve positioner, 4-balance valve, 5-cylinder, 6-water seal valve, 7-inlet pipe, 8- elbow, 9-three-way pipe, 10-transmitter, 11-adjustable one-way steam valve, 12-adjustable throttling muffler, 13-rising pipe. DETAILED DESCRIPTION

[0033] The specific embodiments of the utility model will be described below in combination with the drawings. Embodiment 1

[0034] A pneumatic control valve vibration damping system based on throttling regulation, as shown in Figure 1 , 3As shown, including the installation on the furnace top pipe 13, pipe 13 through the three-way 9 connecting elbow 8, elbow 8 upper section is provided with the pressure transmitter 10 of signal connection control system, the end of elbow 8 is provided with water seal valve 6, water seal valve 6 is driven through the cylinder 5 of connecting instrument pressure air 1, the gas source interface of instrument pressure air 1 is connected with the power gas source input end of valve positioner 3, valve positioner 3 is electric-gas valve positioner 3, valve positioner 3 is connected with control system signal, and 4-20mA control signal is connected, air filter pressure reducing valve 2 is installed on the gas source pipeline between instrument pressure air 1 and valve positioner 3, the output gas pressure end of valve positioner 3 is connected with the gas inlet of cylinder 5 through two gas inlet pipes 7, the cylinder is used double-acting cylinder, and the extension and retraction of cylinder piston are controlled respectively by valve positioner 3, and the balance valve is crossed between the two gas inlet pipes 7 to balance the gas pressure between both ends, prevent pressure mutation in the process of reversing, the balance valve 4 is crossed between the two gas inlet pipes 7, and the adjustable one-way steam valve 11 is respectively installed on the two gas inlet pipes 7, the model of adjustable one-way steam valve 11 is ASC-020, and the piston rod of cylinder 5 is connected with the valve stem of water seal valve 6. Example 2

[0035] A kind of throttling regulation based on pneumatic control valve vibration damping system, as shown in Figure 2 、 3 As shown, including the installation on the furnace top pipe 13, pipe 13 through the three-way 9 connecting elbow 8, elbow 8 upper section is provided with the pressure transmitter 10 of signal connection control system, the end of elbow 8 is provided with water seal valve 6, water seal valve 6 is driven through the cylinder 5 of connecting instrument pressure air 1, the gas source interface of instrument pressure air 1 is connected with the power gas source input end of valve positioner 3, valve positioner 3 is electric-gas valve positioner 3, by receiving control signal and converting into pneumatic control signal to accurately control the opening and closing position of pneumatic valve, valve positioner 3 is connected with control system signal, and 4-20mA control signal is connected, air filter pressure reducing valve 2 is installed on the gas source pipeline between instrument pressure air 1 and valve positioner 3, adjustable throttling muffler 12 is installed on the exhaust port of valve positioner 3, the specification of adjustable throttling muffler 12 is PSB / ST-4, the output gas pressure end of valve positioner 3 is connected with the gas inlet of cylinder 5 through two gas inlet pipes 7, the balance valve 4 is crossed between the two gas inlet pipes 7, and the piston rod of cylinder 5 is connected with the valve stem of water seal valve 6.

[0036] The scope of the utility model claimed is not limited to the above specific embodiments, and for those skilled in the art, the utility model can have multiple variations and alterations, and any modification, improvement and equivalent replacement made within the concept and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A kind of based on throttle control's pneumatic regulating valve stable system, including installation on the top of furnace riser (13), the riser (13) is connected elbow (8) by tee (9), the elbow (8) upper section is equipped with the pressure transmitter (10) of signal connection control system, the end of the elbow (8) is equipped with water seal valve (6), it is characterized by: The water seal valve (6) is driven by a cylinder (5) connected to the instrument air (1), the instrument air (1) is connected to the power source input end of the valve positioner (3), the valve positioner (3) is connected to the control system signal, the output air pressure end of the valve positioner (3) is connected to the air inlet of the cylinder (5) through two air inlet pipes (7), each of the two air inlet pipes (7) is provided with an adjustable one-way steam valve (11), and the piston rod of the cylinder (5) is connected to the water seal valve (6).

2. A kind of throttle control based on pneumatic regulating valve damped system, including installation on the top of furnace riser pipe (13), the riser pipe (13) is connected elbow (8) by tee (9), the elbow (8) upper section is equipped with the pressure transmitter (10) of signal connection control system, the end of the elbow (8) is equipped with water seal valve (6), it is characterized by: The water seal valve (6) is driven by a cylinder (5) connected to the instrument air (1), the instrument air (1) is connected to the power source input end of the valve positioner (3), the valve positioner (3) is connected to the control system signal, the output air pressure end of the valve positioner (3) is connected to the air inlet of the cylinder (5) through two air inlet pipes (7), each of the two air inlet pipes (7) is provided with an adjustable one-way steam valve (11), and the piston rod of the cylinder (5) is connected to the water seal valve (6).

3. The system according to claim 1 or 2, characterized in that: An air filter pressure reducing valve (2) is installed on the air source pipeline between the instrument air (1) and the valve positioner (3).

4. The system according to claim 1 or 2, characterized in that: The two air inlet pipes (7) are connected by a balance valve (4).

5. The system according to claim 1 or 2, wherein: The valve positioner (3) is connected to a 4-20mA control signal.

6. The system of claim 5, wherein: The valve positioner (3) is an electric-gas valve positioner (3).

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