Design And Experimental Research On Tube And Shell Condenser With Liquid Separation Structure

Energy conservation and emission reduction, increasing energy efficient is a recognized effective way to solve the energy problem and environmental problem. Now boosting the equipment efficiency is an effective method for energy conservation and emission reduction. In this paper, we proposed to eliminate the tube condensate promptly based on the new theory of improved tube condensation heat transfer, so as to decrease the thickness of the liquid film and increase the average dryness of working medium, and maintain a higher heat transfer coefficient of condensation heat transfer.In this paper, based on the improved heat transfer theory, we designed a gas-liquid separation tube and shell condenser with water-cooling in view of the heat transfer behavior of R245 fa in tube, and then on the basis of design of general condenser, the area of liquid separation holes on the pass partition was determined through the relevant assumptions and the built physical model, and the known process data and the empirical formulas. So we get the Tube and Shell Condenser with Liquid Separation Structure. And then with the help of the low temperature geothermal organic Rankine’s circulation experiment platform, we completed the experimental comparison of heat transfer performance between the designed condenser and the traditional condenser, mainly on four aspects such as the heat exchange amount Q, the overall heat transfer coefficient K, pressure loss of tube side Δ P and the ratio of K/Δ P. The main works are as follows:Combined with the traditional design method of heat exchanger, the heat exchange amount and the average heat transfer temperature difference of the condenser were determined in turn through the given process parameters, and then got the initial structure size of the condenser according to the forecasted heat transfer coefficient. In the process of checking, the qualified experience formulas were selected to check the heat transfer coefficient and pressure loss of tube side and shell side, in order to make it conform to the requirements of the design specification. Combined with the Nusselt filmwise condensation heat transfer theory, the length of heat pipes was determined under the "short pipe effect" theory. Established the physical model of gas-liquid separation about liquid separation holes, and the forces in the process of separation were described using the classic theory. At the same time, the condensate in the first and second passes was respectively estimated, and the diameter of the liquid separation holes can be calculated combined the physical model of gas-liquid separation and the area of the left and right pass partition. And then layout the liquid separation holes symmetrical so as to complete the design of the high-performance condenser.The experiment result expresses that:(1) The heat exchange amount of condenser with liquid separation structure is higher than the traditional condenser, which is most obvious in the case of liquid separation holes were set at the bending end of tube side. When the inlet steam flow is constant, the heat exchange amount of each temperature state point of liquid separation holes were set at the bending side is respectively increased by 2.2%, 5.2%, 8.6%, 11.9% than the traditional condenser with the increase of temperature. When the temperature of inlet steam is constant, the heat exchange amount of each temperature state point of liquid separation holes were set at the bending end of tube side is respectively increased by 5.2%, 5.3%, 3.1%, 4.6% than the traditional condenser with the increase of steam flow.(2)When the inlet steam flow is constant, the average heat transfer coefficient of condenser with the liquid separation structure at the bending end of tube side has the minimum slowing trend with the increase of temperature. When the temperature of inlet steam is constant, the average heat transfer coefficient at every state point is higher than the other three ways with the increase of flow rate.(3)Under the condition of the steam temperature or flow rate is constant, the effect of liquid separation structure to pressure loss of the condenser is not obvious.(4)The K/Δ P of condenser with the liquid separation structure is higher than the traditional condenser. And the performance of K/Δ P under the circumstances of liquid separation holes were set only at the inlet end of tube side is not obvious compared with the traditional condenser. The area of the tube and shell water-cooling condenser with the liquid separation structure can be decreased 20.5%~41.6% because of the intensified heat transfer in tube under the same heat transfer amount.