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Design Key Points of High Temperature and High Pressure Valves for Multilayer Slit Heat Pipe
At present, the commonly known construction of multi-layer narrow slit high-temperature and high-pressure valves is generally composed of wire mesh, packing, or corrugated plates. By utilizing the mechanism of flame suffocation and extinction in the gap flow channel, the goal of flame retardancy is achieved. However, due to the high heat generated by the combustion products of the flame in the pipeline, if the heat cannot be transferred in a short period of time, there is a risk of ignition of the combustible gas mixture on the other side of the high-temperature and high-pressure valve, leading to flame retardant failure and catastrophic accidents; At the same time, fire-resistant components such as metal wire mesh may sometimes be burned out at high temperatures, which can affect the service life of high-temperature and high-pressure valves.
In order to overcome the shortcomings of low heat transfer ability of existing multi-layer narrow high-temperature and high-pressure valves, the present invention provides a new type of multi-layer narrow flame arresting device. The device not only uses the mechanism of extinguishing flames through the gaps between the plates in the pipeline to achieve the purpose of flame arresting, but also utilizes the good thermal conductivity characteristics of specially made heat pipes to quickly transfer the heat of flame combustion inside the pipeline to the outside of the high-temperature and high-pressure valve, Avoid ignition and combustion of flammable materials on the other side of the high-temperature and high-pressure valve. In addition, under normal operating conditions, due to the fact that the heat pipe is in a non startup state, its thermal conductivity is very low, which can avoid unnecessary heat loss in the pipeline.
The technical solution of the present invention is: a multi-layer narrow heat pipe high-temperature and high-pressure valve, including a high-temperature and high-pressure valve body, a heat pipe with fins, a sealing ring between the high-temperature and high-pressure valve body and the heat pipe, and a radial angle between the heat pipe and the horizontally arranged high-temperature and high-pressure valve body of 60-120 degrees. The upper part of the high-temperature and high-pressure valve body is equipped with a fixed cap, and there is a pressure cap between the fixed cap and the high-temperature and high-pressure valve body. A packing is installed between the lower part of the gland and the heat pipe. The lower part of the heat pipe is equipped with multiple layers of fins. The extended part of the upper part of the heat pipe is a heat dissipation section, which quickly transfers the heat inside the high-temperature and high-pressure valve channel to the outside of the high-temperature and high-pressure valve, and quickly dissipates it. The spacing of the fins can be adjusted according to the needs of fire resistance. The sealing ring prevents gas leakage between the heat pipe and the high-temperature and high-pressure valve body. The fixed cap and the gland under the fixed cap compress the packing that serves as a seal, ensuring the sealing of the high-temperature and high-pressure valve body. Assemble the high-temperature and high-pressure valve as required and connect it to the pipeline. Due to the fact that heat pipes are a type of thermal conductive element that can conduct heat at high speed in a single direction under certain conditions, they use the principle of phase change to complete heat conduction. Their heat transfer ability can be thousands of times higher than that of metals with the best thermal conductivity. The multi-layer narrow heat pipe high-temperature and high-pressure valve of the present invention is installed on the pipeline and device that needs to be blocked from fire. Under normal circumstances, the heat pipe is in a non starting state, and the thermal conductivity of the heat pipe is very small. When deflagration, flashback, or flashover occurs inside the pipeline or device, the heat pipe can be immediately started due to the temperature being higher than the predetermined starting temperature, and the heat generated by flame combustion can be quickly eliminated from the pipeline or device with a thermal conductivity thousands of times higher than that of good thermal conductive metals (such as gold, silver, copper, etc.). The fins of the heat pipe in the high-temperature and high-pressure valve form multiple layers of narrow slots, which can suppress flames and evenly distribute heat on the heat pipe, further improving the reliability and safety of the high-temperature and high-pressure valve. After the flame is extinguished, the heat pipe will quickly return to a low thermal conductivity state.
The beneficial effect is that by combining the quenching principle of narrow slits on flames and the efficient thermal conductivity of heat pipes, it can make up for the shortcomings of the existing ordinary multi-layer narrow slit high-temperature and high-pressure valves where the heat of combustion products cannot be quickly transferred out of the pipeline. The flame retardant effect is good, the reliability is greatly improved, the structure is simple, the geometric size is small, and the manufacturing cost is low.
