Refrigerant liquefied gas tank to maximize the volume of the design
Refrigeration of liquefied gas tank tank relative tank cars, storage tanks and other storage and transportation equipment, has the following advantages and many other advantages:
(1) Not only can be used as transportation means, but also be used as storage container in the place of production and use;
(2) door-to-door transport can be achieved, making transport more secure and reliable;
(3) Can realize the road, rail, river, ocean transport, greatly shorten the loading dock station loading and unloading time. box
Can be stacked 6 to 9 layers, possession of small venues;
(4) Since tank containers can realize separation of containers and trucks, enterprises that own tank containers may not need to have both a self-provided vehicle and a self-provided vehicle at the same time.
The structure of the refrigerated liquefied gas tank container has matured with decades of technological development. In order to further save energy and reduce consumption and improve the economic benefits of industrial production, under the precondition of ensuring safety, the unit weight of liquefied gas tank The more liquid containers are transported, the lower the weight of liquefied gas tank containers and the total tank volume. This paper mainly analyzes the current domestic optimization of the tank for the liquefied gas tank volume to maximize the design of several programs.
Strain hardening process
Strain hardening process, refers to the austenitic stainless steel inner container at room temperature to exert enhanced pressure, stretching to plastic deformation, unloading the overall plastic deformation of the shell, stainless steel yield strength increase, plasticity down, so as to achieve structural stability Container. Taking a 40-ft tank as an example, the inner container with strain-hardening process can be reduced from about 2 tons in total. Tanks with different tank types have a requirement on their total weight. This means that a tank can save about two tons of raw materials costs, and multi-containing 2t or so medium.
2 beamless design
Early refrigerated liquefied gas tanks usually have four beams at the eight corners of the can body to increase the stability of the tank frame. However, with the further increase of the market demand for heavy container capacity, the four crossbeams have been gradually canceled in recent years. The four beams, generally 5mm above the thickness of the rectangular carbon steel production to 40ft tank, for example, the total weight of about 650KG, no beam design to further reduce the tank from the total, to enhance its capacity to hold the volume of the weight Limits.
3 high vacuum multi-layer insulation
Since the container medium is a refrigerating liquefied gas, the tank structure is an inner layer and an outer layer, and the middle layer is provided with an interlayer thermal insulation to prevent the inner medium from absorbing heat and evaporating too fast. Early tank generally use vacuum powder, in order to achieve the adiabatic effect, the sandwich thickness of about 200mm generally required. The outer container tank can be designed to the maximum diameter is a fixed value, too thick sandwich space to compress the full volume of its inner container. With the advent of high-vacuum multi-layer insulation technology, a breakthrough has been made in maximizing the tank volume, reducing the thickness of the interlayer to about 80-100 mm. High-vacuum multi-layer insulation is achieved by evacuating the interlayer and wrapping the inner container in the interlayer with a plurality of layers of heat-insulating paper reflective screen made of aluminum foil and fiberglass paper so as to greatly reduce the external flow of the refrigerated liquefied gas tank through convection , Thermal conductivity, radiation and other means of flow into the liner of the heat to make it to meet the normal storage and transportation of liquefied gas refrigeration role. Taking a 20-ft tank as an example, the change in the form of the mezzanine insulation can increase the tank's effective volume from about 13 m³ to about 18 m³. And because of vacuum powder composite insulation paper replacement, its weight can be reduced by about 1.5 tons.
4 strengthen the ring outside
In order to increase the stability of the container outside the tank, usually the outer container of the tank is provided with an angle reinforcing ring, and the spacing between the reinforcing rings is set so that the thickness of the structure and the outer container are set at 200-600 mm. In the past, the reinforcing ring was generally arranged inside the container outside the tank. In order to reserve the space for the reinforcing ring, the thickness of the composite insulating paper and the space for packing the inner container and the outer container, the interlayer space of the tank is generally set at about 80-100 mm , And now, the strengthening of the external design of the ring has been more and more used in the container requires a relatively high case. The scheme is that the reinforcing ring is designed on the outer side of the outer container based on the maximum diameter of the outer container and is interrupted at the top and the left and right sides of the outer container with a super wide and super high position and the reinforcing plate is connected with the reinforcing ring . By strengthening the outer ring design, making the tank sandwich to further reduce the volume to about 45-70mm to 20ft tank, for example, the tank volume can be increased to about 20m³. With the development of social industrialization, the demand for refrigerated liquefied gas is increasing day by day. Due to its advantages of flexible transportation and low transportation cost, the demand for refrigerated liquid gas tank containers has been increasing. Tank tank design to maximize the volume of transportation costs can be reduced to achieve the effect of energy-saving emission reduction and enhance product competitiveness.