Technical Way to Strengthen Gas Supply Reliability of Gas Pressure Regulating Equipment
Coal Activated Carbon For Recycling Of Solvents
Using high quality coal as raw
material for solvent recovery, coal is mainly used in the recovery of
benzene, toluene, ether, alcohols, gasoline, three, methyl chloride,
organic solvents and other hydrocarbons, as well as the vapor recovery
of hydrocarbon compounds.
Use: Used in the seperation and recycling of aethers,
ketons, alcohols, tetrahydrofuran, methylene dichloride,
trichloromethane, trichloroethylene, chlorinated polyvinyl chloride,
carbon bisulfide, benzene, gasoline etc.
Spec.:
China's urban pipe network mostly uses medium-pressure transportation (generally 1-4bar), while the direct-fired equipment (gas boiler, direct-fired central air-conditioning unit) uses low pressure (usually 50-100mbr). This type of user has developed a special pressure regulating station for YWH series direct-fired equipment.
The series of pressure regulating stations are characterized by industrial gas (sudden flow change, need to be quickly opened and closed, uninterrupted gas supply). In addition to the design, the two-way automatic switching is adopted, which has functions of filtration, pressure regulation and metering. The pressure regulating station also has the characteristics of stable reaction pressure and high closing precision under the condition of large flow range change. It can meet the requirements of industrial and civil direct combustion equipment.
Main features:
The system is standard, and the main and auxiliary voltage regulators are all made by international famous brands. Other parts are domestic high-quality products, achieving high quality, high reliability and high precision work. The pressure regulating station is equipped with a unique structure filter with a filtration accuracy of 5μM. In addition, the differential pressure gauge can reflect the dirtyness of the filter element, and the user can replace the filter element in time. The regulator is equipped with an ultra-high/low-pressure automatic shut-off device and a safety release device to ensure that the outlet pressure is automatically kept within a certain range as the gas consumption changes and the inlet pressure fluctuates. The device has superior expansion performance, and can increase system functions such as flow direction meter, pressure recording, noise reduction, monitoring, heat preservation and heat mixing measures according to user requirements.
The results of the pressure regulating station are compact, the installation process is simple, and the unique patented cabinet design is more beautiful. The surface of the cabinet is phosphatized and rust-proof, suitable for indoor or outdoor installation, and the safety distance can be greatly reduced. The equipment is tested for air tightness before production, and its control points are strictly set according to user requirements, ensuring that the user's on-site operation is simple and convenient.
Main technical parameters of special pressure regulating box (station) for direct combustion equipment:
1. Gas pressure regulating station and main performance indicators
The gas pressure regulating station is generally composed of a pressure regulator, a filter, a quick safety shut-off valve, a safety release device, a measuring instrument, a process pipeline, a valve, etc., and its main task is to receive the upstream pipe network to collect gas, perform filtration, pressure regulation, and stabilization. The pressure, metering and related parameter records are adjusted and controlled according to the pressure and flow of the pipeline.
(1) The main operating parameters of the pressure regulating equipment are: inlet pressure P1; outlet pressure P2; closing pressure Pb; discharge pressure Pf; cut-off pressure Pq.
(2) Determination of operational parameters of the pressure regulating station a. The relationship between the closing pressure and the outlet pressure is based on the regulator's voltage regulation accuracy Sp (Sp = 0.5% to 1.5%) and its performance, and the relationship between the closing pressure and the outlet pressure: Pb = 1.1 to 1 .25P2
b. The relationship between the closing pressure and the releasing pressure can be used to relieve the leakage problem caused by the tight closing of the pressure regulator. Generally, the discharge is started after the closing pressure exceeds 10% to 20%, and the discharge pressure is Rf=1.1~1. 2Pb.
c. The relationship between the cut-off pressure and the release pressure causes the gas to dissipate, which is not conducive to environmental protection and the safety of surrounding life and property, and wastes energy. In order to prevent long-term release, generally consider that the discharge pressure exceeds 10%-20% to cut off the gas source, that is, the cutting pressure is Pq=1.1～1.2Pf.
2. Regulator failure and technical measures
Regulator failure
In actual operation, the regulator will fail due to its own quality problems, unclean temperament and poor maintenance management. Generally, there are mainly the following situations:
First, the regulator fails, overpressure supply, so that the inlet pressure (high pressure or medium pressure) directly enters the downstream pipe network and the user without depressurization, causing damage to the gas meter, pipeline and gas equipment, and even causing fire, a serious accident such as an explosion;
Second, the regulator fails, the outlet pressure drops rapidly or the gas supply is shut off, the supply pressure of the downstream pipe network and the user will decrease, and there is a large difference in height between the regulator and the user, which will lead to the pipe network. "Empty operation", the supply air pressure is seriously insufficient, etc., causing a risk factor such as a flameout in the user terminal, a mixture of gas and air in the pipeline, causing an explosion;
Third, the voltage regulator malfunctions, and the supply air pressure fluctuates, causing the user to burn the gas incompletely, resulting in unsafe factors.
In the above situation, according to the convention, only the following measures can be taken: Under normal circumstances, one pressure regulating system in the pressure regulating station is in working state, and the other road is in standby standby state. When the pressure regulator fails, causing overpressure release, etc., after receiving the user report, the operator can arrive at the site for processing, take the shutdown fault regulation system, and open another pressure regulation system and safety release device to make it work normally. . This kind of practice will bring many unsafe factors to the user, and even cause more serious security incidents, and its security is extremely poor.
Coping with technical measures
Adopting the “three-pressure†test measures on the basis of technical parameter adjustment, simultaneous detection and commissioning of three pressures of pressure regulator outlet pressure (P2), closing pressure (Pb) and rapid safety shut-off valve shut-off pressure (Pq) . To guide the operation and maintenance management work, eliminate faults in time, and ensure normal operation. The detection method is:
a. Pressure regulator outlet pressure (P2) detection: Using the station internal pressure automatic recorder, the 24-hour running pressure test record is analyzed, and the pressure fluctuation and stability are analyzed. When an abnormal situation occurs, the regulator is considered to be faulty and should be repaired and maintained in a normal operating state.
b. Regulator closing pressure (Pb) detection: In the case of ensuring the normal operation of the equipment of one regulating station and satisfying the supply of the network, first close the valve after the other regulator, and then observe the outlet pressure of the regulator. The outlet pressure will gradually rise and reach a certain value (P). When P<1.25P2, the regulator is considered to be stable and working normally. When P>1.25P2, the regulator is considered to be unstable and faulty, and maintenance should be performed immediately.
c. Safety shut-off valve cut-off pressure (Pq) detection: When ensuring the normal operation of the equipment of one pressure regulating station and satisfying the supply of air in the pipe network, first close the valve after the other pressure regulator, adjust the pressure regulator to make the outlet pressure safe. Cut off the pressure setting value, observe whether the safety shut-off valve starts to jump and cut off the air source, and judge whether the performance is stable, whether the work is normal, and whether the action is flexible.
Through the above detection method, it can be determined whether the operation of the pressure regulating device is normal, whether the performance is stable, and whether the action is flexible. So as to achieve timely troubleshooting, solve problems, and ensure a safe and reliable gas supply.
According to the above technical principles, in March 2002, we carried out technical transformation of the Lanzhou gas pressure regulating station, installed a fast safety shut-off valve, adjusted the technical parameters, and observed and tested the actual operation, and the work was stable and normal. In April, the Lanwei pressure regulating station was overpressured (P2=3480Pa), which caused the fast safety shut-off valve to take off and cut off the air source. The pressure of the two-way regulator dropped to its set working pressure (P2= When 2200Pa), the operation is automatically started to ensure normal gas supply, avoiding an accident and achieving the purpose of safe gas supply. So far, the Lanzhou gas pipeline network has not experienced an overpressure, depressurization, and gas outage accident, which has truly achieved the goal of safe and stable long-term operation.
(From Hebei Zhenxing Gas Pressure Regulator Co., Ltd.** Gas ​​Regulator http://)
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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