DEAR Biogas purification unit.If the nitrogen purity at the top of the lower tower is improved, the temperature at the nitrogen side will be reduced, the temperature difference between the main cooling system and the evaporation of liquid oxygen will be reduced, and the rising speed of liquid level will be accelerated. When the liquid oxygen level rises to a certain extent, the heat load of the main cooler increases gradually. If the regulating valve-1 continues to be closed, the liquid nitrogen level in the main cooling system will be too high, which will affect the heat transfer of the main cooling system, and the air volume will not be able to enter.The liquid valve should be configured with a 10 ° inclination angle between the valve stem and the horizontal, so as to avoid the liquid flowing out along the valve stem and increase the cold loss; what's more important is to avoid the liquid touching the sealing surface of the packing to make it cold and hard and lose the sealing effect, resulting in leakage; the connection of the safety valve should have an elbow to avoid direct impact on the valve; in addition, it should ensure that the safety valve does not frost, so as to avoid failure during operation;
DEAR Biogas purification unit.On the plane rectangular coordinate map, according to the value of ordinate and abscissa, a point can be determined on the plane. This is just like the seat can be determined according to the rows and numbers, and the geographical position can be determined according to the longitude and latitude. A point on the thermodynamic property diagram represents a state. After the state point is determined, other related state parameters can be found directly from the graph.DEAR Biogas purification unit.The corresponding model of the equipment matched with the air separation unit has also been compiled. For example, the model of fractionator: fon-6000 / 13000 means: f-fractionator: on oxygen and nitrogen products; 6000 - oxygen production, m3 / h; 13000 - nitrogen production, m3 / h. Model of liquefaction equipment: ypon -- 200 / 300 means y-liquefaction unit; p-expander; on oxygen nitrogen product; 200 liquid oxygen output L / h; 300 liquid nitrogen output L / h.DEAR Biogas purification unit.The explosion position of condensing evaporator varies with its structure. Generally, it is easy to occur at the boundary of liquid oxygen surface and some channels with poor flow of liquid oxygen, and it also occurs at the lower tubesheet or the upper cover. For the auxiliary condensing evaporator, the explosion is easy to occur in the lower part of the liquid oxygen near the end of evaporation.
DEAR Biogas purification unit.Machinery industry, mainly used for metal cutting and welding. Oxygen is used as combustion supporting agent of acetylene to produce high temperature flame and melt metal. In national defense industry, liquid oxygen is often used as the combustion supporting agent of rocket. The combustible material soaked in liquid oxygen has strong explosiveness and can be used to make liquid oxygen explosive. In addition, in the medical sector, oxygen is also an indispensable material for first aid and adjuvant treatment of patients. Therefore, oxygen production is an indispensable part of the national economy.The expansion air volume is about 70% of the processing air volume, so the throttling effect cooling capacity accounts for about 1 / 4 of the total cooling capacity. For the process of piston expander, when the cam of expander and high pressure air throttle valve are adjusted to increase the high pressure air pressure, the refrigerating capacity of expander and throttling effect will increase at the same time, which has a significant effect on improving the liquid oxygen level.
Because the temperature drop of air is still reduced, but there are some changes in the proportion of temperature drop distribution. The temperature in the middle is bound to rise, and it is much higher than that in the cold end, because the temperature drop in the lower half of the air increases. The increase of middle temperature reflects the increase of cold end temperature, the expansion of cold end temperature difference and the decrease of hot end temperature difference. Moreover, the range of temperature change in the middle is larger than that in the end. The change of temperature is 1 ℃ in the end and 10 ℃ in the middle.Inter wall type: the cold and hot fluids are separated by the heat transfer wall, and do not contact each other in the heat transfer process. Heat is transferred from the hot fluid to the cold fluid through the wall, such as tubular and plate heat exchangers. Heat storage type: the cold and hot fluids flow alternately through the solid heat storage body with sufficient heat capacity, the heat storage body absorbs heat when the hot fluid flows, and the heat storage body releases heat when the cold fluid flows, so as to realize the heat exchange between the cold and hot fluids.
