Gas burner valve introduction

Gas Burner Safety Valve is an important part of the blast furnace steel smelting equipment. gas burner valve's main role is to blast heated to the required temperature, to improve the effectiveness and efficiency of the blast furnace. But in the smelting process often want to adjust the size of the gas flow in order to meet a variety of conditions for steel smelting. In order to achieve the purpose of freely adjust the airflow needed valves or gas burner valve open or closed. Wherein the gas burner valve open and close instantly generate a loud noise, and the noise has already become one of the three major threats to human survival pollution, noise of people have serious psychological and physiological effects. Hence, the need for gas burner valve acoustic simulation analysis, in order to get the noise level of the Gas Grill Control Valve, thereby determining the degree of noise hazards, and the main reason for the noise generated by the vibration, but also due to the valve or valve in the process of using high frequency belonging prone to damage the parts, so the gas burner valve said anything solid coupling analysis of noise and strength check has important practical significance.

     Author for the study of a gas burner valve acoustic structure interaction analysis, mainly from the modal shape and sound solid coupling analysis and other aspects of the area around the valve body and the fluid. Focus calculated valve and valve surrounding sound field, got within a certain area around the gas burner valve noise level in order to achieve noise reduction by changing the structure of the results, and expect the results of this calculation for the gas Burner Valve noise can have some reference significance.

High pressure multi-stage pressure regulator gas burner valve trim

    This adjustment member has an inner Range Top Burner Valve pressure drop across the gas burner valve will be divided into several smaller pressure drop and ensure that each of the smaller voltage drop on PVC> PV effect, which can prevent the generation of cavitation. Since the multi-stage vacuum dispersed stream power, thereby reducing the sound conversion efficiency.
Limiting orifice has increased partial pressure of back pressure device to ensure that PVC gas burner valve on the> PV, prevent cavitation generation. Due to the increased back pressure device, so that the sound spectrum partially transferred, to achieve the purpose of noise reduction.
  Can not prevent the occurrence of cavitation, but reduce its harm.
The cavitation bubbles within the contact surface with bubbles isolating gas burner valves and hardened gas burner valve and seat surface will be the impact of cavitation, while adding body outlet bushing in place to protect the bullied eclipse the impact site. gas Safety Valve Burner Valve at the outlet bushing plus body as a supplement designed to prevent the liquid collision in the gas burner valve body wall, protecting the gas burner valve by scouring the site, at the same time weaken some noise.
  Plus silencer to the partial pressure of the gas burner valve and sub-noise. This approach is essentially the cavitation condition into a flash conditions to deal with, so applications need to simultaneously trim do to protect hardened gas burner valve.
Epilogue
  Regulating gas burner valve serious noise pollution is not only the environment but will also control gas burner valve factory vibration, vibration can damage the gas burner valve spool and gas Burner Valve seat. The gas burner valve may cause damage to the regulator circuit fault, the interlock device substandard product failures and other issues. Therefore, effective control gas burner valve noise makes our production safer, better environment.

Cavitation burner valve noise control

By adjusting the Burner Valve surface hardening treatment can improve the hardness of the control burner valve, the control burner valve to enhance the ability of anti-flash "erosion", the corresponding noise will be reduced 5 ~ 10dB. To further reduce noise, can be used with the methods used are: ① improve the pipe wall thickness or adding sound insulation layer in the pipe wall. Regulating burner valve the same diameter, which each additional level of pipe wall thickness, the measured value of the noise can be reduced by about 2dB; ② pipe plus sound-insulating layer to reduce the substance of pipe wall thickness also increases a measure of noise transmitted to the environment; ③ the regulating Gas Top Burner Valve after the installation of the online muffler, online muffler can absorb some of the sound energy, and after the formation of back pressure burner valve, which can effectively reduce the noise level of about 25dB.

    Blocking flow flows through the burner valve when cavitation bubbles generated in the contact portion of the burner valve rupture, collapse of bubble energy will be released slowly tearing the material, and the parts in contact with the control burner valve leaving a rough surface similar to the slag . This process will produce noise emitted as gravel stream crossing the Stove Top Burner Valve.

    Cavitation There are two ways to control: the first is to completely prevent the occurrence of cavitation; the second is not to prevent the occurrence of cavitation, but reduce its harm.

Flash condition noise of gas burner valve

    Blocking flow through the regulator Stove Top Burner Valve when a flash occurs, the bubble generated downstream adjustment spool Gas burner valve will produce erosion by scouring the spool surface will smooth polished appearance, this process with great noise generation.

    From the mechanism of the Gas burner valve to flash the (PVC <PV and P2 <PV) adjustment, the flash can not be eliminated, only to find ways to reduce the harm flashing on the control Gas burner valve, thereby reducing noise. Commonly used method is the region of the material to be washed surface hardening treatment, surface hardening treatment methods include three types:

    (1) The seat and the gas safety burner valve surface spraying, can be sprayed tungsten carbide, chromium carbide or increase the hardness and other parts subject to erosion.

    (2) the surface of the Gas burner valve seat and gas Burner Valve body surfacing treatment, usually by welding increase the hardness of erosion site.

    (3) the Gas burner valve seat and Gas burner valve surface nitriding treatment to improve the surface hardness and wear resistance, corrosion resistance.

There are three main control gas safety burner valve noise sources

    (1) itself vibration noise. Medium flows through the control Gas safety burner valve spool will produce erosion, lateral movement of the spool produce unstable even resonate with the device. Due to the use of self-regulating Gas safety burner valve vibration is inevitable, so this kind of noise generation is also inevitable. Note that when you try to install the Gas safety Burner Valve upright on a horizontal pipe installed to reduce noise generated due to the spool instability, usually this kind of noise is very small, resulting in little impact.

    (2) Aerodynamic noise. When contracted flow medium flows through the Gas safety burner valve section, the flow cross section due to contraction of the flow path blocking sudden changes occur turbulence, while the medium flow rate is changed, the mechanical energy is partially converted liquid noise acoustic energy generated by known aerodynamic Science noise. Because fluid turbulence Gas safety burner valve when pressure is inevitable, so the aerodynamic noise can not be completely eliminated. Usually this type of noise level is small, resulting in little impact.

    (3) Hydrodynamic Noise. Fluid control gas safety burner valve in the rapid formation of blocking flow velocity. Blocking flow refers to the incompressible or compressible fluid flows through the Gas safety burner valve when the maximum achievable flow state. At a fixed inlet conditions, when the Gas safety burner valve before the pressure kept constant while gradually reducing the pressure after the Gas safety burner valve, the flow through the flow regulating Gas safety burner valve increases to a maximum limit, and then continue after the pressure reducing gas Burner Valves, the flow rate will not increase, the limit that is blocking traffic flow. Blocking the flow of liquid can easily cause flash cavitation, accompanied by strong noise generation, this noise is usually up to about 100dB, resulting in a large impact.

The positioner structure of smart burner valve

     When off, the positioner output is locked, pneumatic actuators maintained at the current position. That is, without any additional accessories, positioning itself to achieve the function off signal to secure his position.

     When off the power, shown in Figure 1, this protection scheme without power, so there is no break in power protection. Have no effect on whether the power pneumatic control Burner Valves position.

     (2) for the use of a nozzle flapper mechanism of smart burner valve positioner:

     Its power supply is connected in series with the input signal circuit burner valve, the off signal / power-up, the locator can automatically detect the abnormal pressure signal output to adjust the pneumatic control burner valve membrane compartment is locked, pneumatic adjustment Safety Valve Burner Valve position is held at fault . That is, without any additional accessories, positioning itself to achieve power, off the signal function to secure his position.

     The foregoing analysis, the structure itself, the use of the seismic performance of piezoelectric smart burner valve positioner burner valve structure better. When using the nozzle flapper mechanism smart Range Top Burner Valve positioner off signals more responsive and simple structure, less attachment, the probability of occurrence of failure in the course is also relatively small.

The work principle of gas safety burner valve

During normal operation, the gas supply pressure (ie, signal pressure air lock Gas safety burner valve) is greater than the set pressure of the air lock Gas safety burner valve, air piping smart Safety Valve Burner Valve positioner output and adjust the pneumatic control Gas safety burner valve diaphragm gas supply pipes are communicated , the control Gas safety burner valve operates according to the positioner output command.

     When breathe source, air pressure (ie, signal pressure air lock Gas safety burner valve) is less than the set pressure of the air lock Gas safety burner valve, pneumatic actuator air lock Gas safety burner valve action, smart Gas safety burner valve positioner output of gas supply lines and pneumatic control Gas safety burner valve adjustment the membrane cartridge is automatically cut off gas supply pipeline, namely the pressure adjusting Gas safety burner valve pneumatic control signal membrane cartridge is locked from outside sources on air, maintaining the original signal and the control Gas safety burner valve spring reaction force equilibrium pressure, thereby failure to achieve when air Gas safety Burner Valve pneumatic control Gas safety burner valve position adjustment is held in place before the failure.

     P / I conversion unit with a permanent magnet, coil, levers, nozzles and other parts of the electrical signal from the control system output signal is converted into a suitable pressure to push start Gas safety burner valve. According to the structure of the form, P / I conversion unit into the nozzle flapper, and the piezoelectric Gas safety burner valve spool type categories. Currently, the market mainstream smart Gas safety burner valve positioner in the I / P conversion unit mainly or piezoelectric nozzle flapper Gas safety burner valve. When breathe source, using the smart Gas safety burner valve positioner action of these two structures the same principle as described above. Using the time is now cut off the signal and power smart Gas safety gas Burner Valve positioners two different structures of the operation principle is analyzed separately.

The realization of gas burner valve

In the modern industrial processes, pneumatic control gas Burner Valve applications are very common, and its role is also very important, related to industrial production safety and economy. In actual production, pneumatic control Gas Burner Valve in accordance with the requirements of the process system needs to adjust various parameters to meet the needs of industrial production. Especially in many important aspects, the pneumatic control Gas Burner Valve if improperly adjusted it will destroy the entire production process and may cause huge economic losses. In general, the need to provide power when the pneumatic control Gas Burner Valve normal operation, the gas source, signal source, any loss of signal will cause improper operation of the Gas Burner Valve. Therefore, in practical industrial processes, commonly used three off protection to ensure reliable operation of pneumatic control gas brass safety valve.

     In engineering practice, when the power failure, breathe, off signals of these three failures in one or several cases occur, pneumatic control Gas Burner Valve fully open Gas Burner Valve automatically considered based process safety factors, the fully closed Gas Burner Valve or Gas Burner Valve failure to maintain position before - three off protection. Among them, close the Gas Burner Valve and open the Range Top Burner Valve body can be used in the cylinder pressure and the reaction force of the spring easily achieved. Three break protection to secure his position in functions to achieve it, it is more complex, and therefore, the paper analyzed and compared to the three projects off the protector of two widely used to secure his position in the functional program.