CN-121655312-B - Self-adaptive waste heat recovery device based on phase change heat accumulator

CN121655312BCN 121655312 BCN121655312 BCN 121655312BCN-121655312-B

Abstract

The invention relates to the technical field of exhaust steam recovery devices, and discloses a self-adaptive waste heat recovery device based on a phase change heat accumulator, wherein a heat medium inlet and a gas outlet are formed in the side face of the self-adaptive waste heat recovery device, a condensate outlet is formed in the lower portion of the self-adaptive waste heat recovery device, a tube side unit comprises a collecting box divided into a first collecting cavity and a second collecting cavity by a partition plate, the first collecting cavity is connected with a refrigerant inlet tube, the second collecting cavity is connected with a refrigerant outlet tube, and a plurality of heat exchange tubes are arranged in a shell and comprise a first heat exchange tube and a second heat exchange tube. According to the invention, the phase change heat accumulator is introduced as a stable intermediate heat source, so that the device can output a continuous and stable heating effect. Even if the flow or the temperature of the deaerator exhaust steam fluctuates, the heat accumulator can buffer and adjust through the heat accumulation and heat release processes of the heat accumulator, and the severe change of the temperature of the downstream desalted water is effectively stabilized, so that the stability of the water inlet working condition of the deaerator is ensured, and the running quality and the running efficiency of the whole thermodynamic system are improved.

Inventors

PAN HUAXIA
Ji Anyuan
TIAN YUANFENG

Assignees

连云港市泰格电力设备有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (5)

1. An adaptive waste heat recovery device based on a phase change heat accumulator, a shell (2) provided with a heat medium inlet (211) and a gas outlet (213) on the side surface and a condensate outlet (212) on the lower part, a tube side unit comprising a flow collecting box (1) divided into a first flow collecting cavity (121) and a second flow collecting cavity (122) by a partition plate (12), wherein the first flow collecting cavity (121) is connected with a refrigerant inlet tube (111), the second flow collecting cavity (122) is connected with a refrigerant outlet tube (112), a plurality of heat exchange tubes arranged in the shell (2) and comprising a first heat exchange tube (221) and a second heat exchange tube (222), the top ends of the first heat exchange tube (221) and the second heat exchange tube (222) are respectively communicated with the first flow collecting cavity (121) and the second flow collecting cavity (122), the self-adaptive waste heat recovery device is characterized in that the shell (2) is filled with a solid phase heat storage material (4), the first heat exchange tube (221) and the second heat exchange tube (222) are respectively immersed in the first flow collecting cavity (121) and the second heat exchange tube (122) to form a thermal storage mechanism (122) in response to a thermal storage mechanism, dynamically changing the number ratio of first heat exchange tubes (221) in communication with the first manifold (121) to second heat exchange tubes (222) in communication with the second manifold (122); the partition adjusting mechanism comprises a temperature sensing air chamber (13) arranged in the partition plate (12), a movable adjusting sealing plate (14) and a heat exchange tube (222), wherein two ends of the temperature sensing air chamber are respectively positioned in a first collecting cavity (121) and a second collecting cavity (122), an active sliding block (131) capable of moving along with the pressure difference of the air cavities at the two ends is arranged in the temperature sensing air chamber (13), the movable adjusting sealing plate (14) is slidably arranged at the bottoms of the first collecting cavity (121) and the second collecting cavity (122) and is used for increasing or reducing the number proportion of interfaces communicating the first heat exchange tube (221) and the second heat exchange tube (222), and the active sliding block (131) and the movable adjusting sealing plate (14) are connected through magnetic coupling or mechanical linkage, so that the movement of the active sliding block (131) can drive the movable adjusting sealing plate (14) to synchronously move; and the heat medium inlet (211) and the gas outlet (213) are provided with regulating valves, and the regulating valves are connected with the partition regulating mechanism in a signal manner and can synchronously regulate the opening degree along with the change of the fluid temperature difference.
2. The self-adaptive waste heat recovery device based on the phase change heat accumulator of claim 1, wherein the solid phase heat accumulation material (4) is a phase change material, and the phase change temperature is between the refrigerant inlet temperature and the steam temperature of the heat medium inlet.
3. The self-adaptive waste heat recovery device based on the phase change heat accumulator of claim 2, wherein the phase change material is one or more of molten salt, crystalline hydrated salt or paraffin.
4. The self-adaptive waste heat recovery device based on a phase change heat accumulator according to claim 1, wherein the first heat exchange tube (221) and the second heat exchange tube (222) are uniformly distributed in the solid-phase heat accumulation material (4) in a spiral shape or a serpentine coil shape.
5. The self-adaptive waste heat recovery device based on the phase change heat accumulator according to claim 1, further comprising a precipitation part (3) communicated with the bottom ends of the first heat exchange tube (221) and the second heat exchange tube (222) and used for precipitating and separating impurities in the refrigerant, wherein a drain pipe (31) with a constant-pressure open valve is arranged at the bottom of the precipitation part (3).

Description

Self-adaptive waste heat recovery device based on phase change heat accumulator Technical Field The invention relates to the technical field of exhaust steam recovery devices, in particular to a self-adaptive waste heat recovery device based on a phase change heat accumulator. Background In the technical field of exhaust steam recovery of a thermal deaerator, various recovery devices have been proposed in the prior art to realize energy recycling. The invention patent with the application number of CN201410847036.3 provides a typical solution for the deaerator exhaust steam energy collector and the energy collecting method thereof. The device mainly comprises a cylinder body, a water spray cooling pipe chamber, an atomization space, a heat and mass transfer component and a steam distributor, and the working principle of the device is that desalted water and deaerator exhaust steam are introduced to carry out mass transfer and heat transfer in the device, non-condensing gas is separated and discharged from the upper part, and condensed water and an atomized liquid film are recovered together. The technology aims at improving the efficiency by integrating various heat and mass transfer modes such as atomization, a water spraying disc, a liquid film and the like, and has the functions of absorbing heat and resolving non-condensable gas. Despite the advances made in the art, there are several significant drawbacks. First, there is still room for improvement in heat and mass transfer efficiency. The integrated mode of 'atomizing, water spraying disc and liquid film' described in the CN201410847036.3 patent may cause insufficient contact between steam and cooling medium due to uneven updating of the liquid film or poor atomizing effect in actual operation, and affects condensing efficiency. The existing waste heat recovery device is fixed in structure and lacks of self-adaptive adjustment capability, common load and parameter fluctuation in the running process of the deaerator are difficult to cope with, and the key problems of high-efficiency, stable and self-adaptive running cannot be fundamentally solved by the existing solutions. Disclosure of Invention Aiming at the defects of the prior waste heat recovery device in the use process, the invention provides a self-adaptive waste heat recovery device based on a phase change heat accumulator, which has the advantages of small temperature fluctuation and self-adjustment, and solves the technical problems in the prior art. The invention provides a self-adaptive waste heat recovery device based on a phase change heat accumulator, which comprises a shell, a tube side unit, a partition unit and a partition adjusting mechanism, wherein the shell is provided with a heat medium inlet and a gas outlet on the side face, a condensate outlet is arranged on the lower portion of the shell, the tube side unit comprises a collecting box which is divided into a first collecting cavity and a second collecting cavity by a partition plate, the first collecting cavity is connected with a refrigerant inlet tube, the second collecting cavity is connected with a refrigerant outlet tube, the heat exchange tubes are arranged in the shell and comprise a first heat exchange tube and a second heat exchange tube, the top ends of the first heat exchange tube and the second heat exchange tube are respectively communicated with the first collecting cavity and the second collecting cavity, the bottom ends of the first heat exchange tube and the second heat exchange tube are respectively communicated with each other, the shell is filled with a solid-phase heat storage material, the heat exchange tubes are embedded and immersed in the solid-phase heat storage material to form a heat storage cavity, and the device further comprises a partition adjusting mechanism which is configured to be capable of dynamically changing the proportion of the first collecting cavity and the second collecting cavity to be communicated with the first heat exchange tube in response to the temperature difference between the first collecting cavity and the second collecting cavity. Preferably, the solid-phase heat storage material is a phase change material, and the phase change temperature of the solid-phase heat storage material is between the temperature of the refrigerant inlet and the steam temperature of the heat medium inlet. Preferably, the phase change material is one or more of a molten salt, a crystalline hydrated salt or a paraffin wax. Preferably, the partition adjusting mechanism comprises a temperature sensing air chamber arranged in the partition plate, wherein two ends of the temperature sensing air chamber are respectively positioned in the first flow collecting cavity and the second flow collecting cavity, an active sliding block capable of moving along with the pressure difference of the air cavities at the two ends is arranged in the temperature sensing air chamber, and a movable adjusting sealing pl