CN-121994059-A - Phase-change heat exchanger

CN121994059ACN 121994059 ACN121994059 ACN 121994059ACN-121994059-A

Abstract

The application discloses a phase change heat exchanger which comprises a shell, an inlet flow dividing baffle, cooling pipes, a convex lower baffle group and cooling pipe middle baffles, wherein the inlet flow dividing baffle is transversely arranged at an inlet and is configured to divide an inflow medium into two parts, namely an upper half part of the inflow medium is used as a condensing fluid path, a lower half part of the inflow medium is used as a hot fluid mass transfer path, a front convex lower baffle and a rear convex lower baffle respectively divide a front cooling pipe group and a rear cooling pipe group from top to bottom to form a dense-to-sparse structure, each group of cooling pipes is also divided into an upper part and a lower part, the cooling pipe middle baffles are arranged below the convex lower baffle group and are arranged in a mode of being orthogonal to the convex lower baffle group, the bottom of the shell comprises a liquid collecting tank and an outlet, and the liquid collecting tank is configured to collect condensed liquid on the cooling pipes, and the outlet is used for discharging the condensed liquid. The phase-change heat exchanger has low energy consumption and high heat exchange efficiency, improves the condensation heat transfer coefficient, and can clean condensate in time.

Inventors

ZHONG XIAOBO
ZHANG XIWEI
XU XIAOYONG

Assignees

中交光伏科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260316

Claims (8)

1. A phase change heat exchanger is characterized by comprising a shell, an inlet split flow baffle, a cooling pipe, a convex lower baffle group and a cooling pipe middle baffle, wherein the convex lower baffle group comprises a front convex lower baffle close to an inlet and a rear convex lower baffle far away from the inlet; The inlet split baffle is transversely disposed at the inlet and is configured to split the incoming media into two portions, an upper portion of the incoming media being a condensing fluid path and a lower portion of the incoming media being a hot fluid mass transfer path; The front convex lower partition plate and the rear convex lower partition plate respectively divide the front cooling pipe group and the rear cooling pipe group from top to bottom and divide each group of cooling pipes into an upper part and a lower part; the cooling pipe middle partition plate is positioned below the convex lower partition plate group and is arranged in a mode of being orthogonal to the convex lower partition plate group; the bottom of the housing includes a liquid collection tank configured to collect condensed liquid from the cooling tube, and an outlet for draining the condensed liquid.
2. The phase change heat exchanger of claim 1, wherein the condensing fluid path is configured to flow through the portion of the cooling tubes above the forward protruding lower baffle and the thermal fluid mass transfer path is configured to sweep the plate surface of the forward protruding lower baffle and through the portion of the cooling tubes below the forward protruding lower baffle.
3. The phase change heat exchanger of claim 1, wherein the cooling tube intermediate baffle is configured to form an inflow medium of a hot fluid mass transfer path into a serpentine flow field.
4. The phase change heat exchanger of claim 1, wherein the inlet split baffle has a chamfer angle.
5. A phase change heat exchanger according to claim 1, wherein the inlet split baffle has a split ratio to the incoming medium in the range of 7:3 to 8:2.
6. The phase change heat exchanger of claim 1, wherein the set of convex lower baffles form a gap with the shell wall, the gap allowing condensed fluid to flow to the bottom of the shell.
7. The phase change heat exchanger of claim 1, wherein the inlet and outlet of the condenser tube are located at the top of the heat exchanger.
8. The phase change heat exchanger of claim 1, wherein the front convex lower baffle and the rear convex lower baffle are each slightly tapered with a center point.

Description

Phase-change heat exchanger Technical Field The application relates to the technical field of efficient heat exchange, in particular to a phase-change heat exchanger. Background The fluoroplastic heat exchanger has the advantages of corrosion resistance, high temperature resistance, large heat transfer coefficient, light weight, long service life, low operation and maintenance cost and the like, and is widely applied to the fields of petroleum, chemical industry, pharmacy, textile, printing and dyeing, transportation, electric power, military industry and the like. The main problems of the traditional fluoroplastic heat exchanger include: 1) The plurality of groups of cooling pipes in the heat exchanger are orderly arranged, so that the flow resistance is high; 2) As the hot fluid is cooled, water vapor, soluble particulate matter, gaseous condensable particulate matter, soluble salts and the like in the hot fluid are condensed into liquid which adheres to the cooling pipes and falls to the bottom of the heat exchanger to be discharged under the action of gravity. However, because the cooling pipes are densely arranged, condensed liquid is easy to accumulate, and the heat exchange efficiency is seriously affected; 3) Gaps are always formed between the cooling pipes and the wall surfaces of the cooler, particularly the positions where the cooling pipes bend back, which can cause uneven flow of hot fluid and further reduce heat exchange efficiency. Disclosure of Invention The application aims to provide a low-energy-consumption and high-efficiency phase-change heat exchanger, which can improve the heating uniformity, reduce the flow resistance, improve the condensation heat transfer coefficient and clean condensate in time. The application discloses a phase change heat exchanger, which comprises a shell, an inlet split flow baffle, a cooling pipe, a convex lower baffle group and a cooling pipe middle baffle, wherein the convex lower baffle group comprises a front convex lower baffle close to an inlet and a rear convex lower baffle far away from the inlet; The inlet split baffle is transversely disposed at the inlet and is configured to split the incoming media into two portions, an upper portion of the incoming media being a condensing fluid path and a lower portion of the incoming media being a hot fluid mass transfer path; The front convex lower partition plate and the rear convex lower partition plate respectively divide the front cooling pipe group and the rear cooling pipe group from top to bottom and divide each group of cooling pipes into an upper part and a lower part; the cooling pipe middle partition plate is positioned below the convex lower partition plate group and is arranged in a mode of being orthogonal to the convex lower partition plate group; the bottom of the housing includes a liquid collection tank configured to collect condensed liquid from the cooling tube, and an outlet for draining the condensed liquid. In a preferred embodiment, the condensing fluid path is configured to flow through the portion of the cooling tubes above the forward convex lower baffle and the hot fluid mass transfer path is configured to purge the face of the forward convex lower baffle and through the portion of the cooling tubes below the forward convex lower baffle. In a preferred embodiment, the cooling tube intermediate separator plate is configured to form the inflow medium of the thermal fluid mass transfer path into a serpentine flow field. In a preferred embodiment, the inlet split baffle has a chamfer angle. In a preferred embodiment, the inlet split baffle to inflow medium split ratio ranges from 7:3 to 8:2. In a preferred embodiment, the set of convex lower baffles forms a gap with the shell wall that allows condensed fluid to flow to the bottom of the shell. In a preferred embodiment, the inlet and outlet of the condenser tube are positioned at the top of the heat exchanger. In a preferred embodiment, the forward convex lower baffle and the rearward convex lower baffle are each slightly tapered with a center point. The application has at least the following beneficial effects: 1. The cooling pipes which are arranged in a front-to-back dense gradient way can reduce the resistance of the front half of the heat exchanger and increase the heat exchange capacity of the rear half; 2. The lower partition board is arranged at the lower section of the cooling pipe, so that on one hand, the space between the cooling pipes at the lower end is increased, and the condensed fluid is favorable for flowing down, and on the other hand, the convex lower partition board is favorable for discharging the fluid flowing down from the cooling pipe from the lower partition board to the liquid collecting tank at the bottom surface; 3. The lower partition plate divides the cooling pipe into two parts, so that the condensed fluid is prevented from flowing to the lower half section of the cooling pipe in a concentrated manner, th