CN-121988050-A - Coil pipe device for large-scale low-temperature evaporation equipment, large-scale low-temperature evaporation equipment and operation method

CN121988050ACN 121988050 ACN121988050 ACN 121988050ACN-121988050-A

Abstract

The invention provides a coil pipe device for large-scale low-temperature evaporation equipment, which can solve the problem of unbalanced load caused by uneven refrigerant distribution of the low-temperature evaporation equipment and comprises a plurality of independent heat coil pipe components; the top refrigerant distribution plate is arranged at the top of the independent heat coil assembly, a plurality of first compartments which are not communicated with each other are arranged in the top refrigerant distribution plate, each first compartment is respectively connected with a refrigerant inlet pipe, each first compartment is respectively communicated with a refrigerant inlet of a different independent heat coil assembly, the bottom collecting plate is arranged below the top refrigerant distribution plate, a plurality of second compartments which are not communicated with each other are arranged in the bottom collecting plate, a refrigerant outlet of the independent heat coil assembly is respectively connected with a different second compartment, each second compartment is respectively connected with a medium outlet pipeline, and the independent heat coil assembly forms a mutually independent refrigerant circulation loop with the first compartments of the correspondingly connected top refrigerant distribution plate and the second compartments of the bottom collecting plate.

Inventors

LIU CHENXI
CHEN GUANGMING
Liang Rongxian
Shen Shuhuan

Assignees

江苏威胜达资源循环科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260331

Claims (10)

1. A coil assembly for a large cryogenic vaporization apparatus, comprising: At least two sets of independent heat coil pipe assemblies, wherein each set of heat coil pipe assembly comprises a plurality of coil pipe layers which are arranged at intervals along the vertical direction, the coil pipe layers of different independent heat coil pipe assemblies are circularly and alternately arranged along the vertical direction, and any two adjacent coil pipe layers are respectively subordinate to different independent heat coil pipe assemblies; The top refrigerant distribution plate is arranged at the top of the independent heat coil assembly, a plurality of first compartments which are not communicated with each other are arranged in the top refrigerant distribution plate, each first compartment is respectively connected with a refrigerant inlet pipe, and each first compartment is respectively communicated with a refrigerant inlet of a different independent heat coil assembly; The bottom collecting tray is arranged below the top refrigerant distribution tray, a plurality of second compartments which are not communicated with each other are arranged in the bottom collecting tray, the refrigerant outlets of the independent heat coil assemblies are respectively connected with different second compartments, and the second compartments are respectively connected with a medium outlet pipeline; the independent thermal coil assemblies form mutually independent refrigerant flow circuits with the first compartment of the correspondingly connected top refrigerant distribution tray and the second compartment of the bottom collection tray, respectively.
2. A coil assembly for a large cryogenic evaporation plant as defined in claim 1, wherein the independent thermal coil assembly comprises a heat exchange coil, a subcooling coil and an intermediate refrigerant redistribution tray, the heat exchange coil being disposed in an upper portion of the independent thermal coil assembly, the subcooling coil being disposed in a lower portion of the independent thermal coil assembly; The inlet of the heat exchange coil is connected with the first compartment, the outlet of the heat exchange coil is communicated with the inlet of the intermediate refrigerant redistribution tray, the outlet of the intermediate refrigerant redistribution tray is communicated with the inlet of the supercooling coil, and the outlet of the supercooling coil is connected with the second compartment.
3. A coil assembly for a large cryogenic evaporation plant as defined in claim 2, wherein said intermediate refrigerant redistribution tray is provided with an internal mixing chamber, and refrigerant flowing from said heat exchange coil is thoroughly mixed within said intermediate refrigerant redistribution tray and then evenly distributed into said subcooling coil for even flow distribution of refrigerant in the flow passages of said subcooling coil.
4. A coil assembly for a large cryogenic evaporation plant as recited in claim 1, further comprising a bottom preheating coil assembly disposed between said independent thermal coil assembly and said bottom collection tray for preheating a liquid stock to be treated of the cryogenic evaporation plant, at least one second compartment communicating with an outlet of said bottom preheating coil assembly.
5. A coil assembly for a large cryogenic evaporation plant as recited in claim 4, wherein the bottom pre-heat coil assembly comprises a multi-layer pre-heat coil and a pre-heat coil inlet pipe, an outlet of the pre-heat coil inlet pipe being in communication with an inlet of the multi-layer pre-heat coil.
6. A coil assembly for a large cryogenic evaporation plant as defined in claim 5, wherein the bottom pre-heat coil assembly operates independently of the individual thermal coil assemblies, and wherein the medium circulating inside the bottom pre-heat coil assembly is a pre-heat medium that is used to heat the stock solution to be treated in the large cryogenic evaporation plant by indirect heat exchange.
7. A coil assembly for a large cryogenic vaporization apparatus as recited in claim 4, further comprising a coil support assembly for securing and supporting said independent thermal coil assembly and said bottom preheat coil assembly.
8. A coil assembly for a large cryogenic evaporation plant as recited in claim 4, wherein a hollow region is left between said top refrigerant distribution tray and said separate heat coil assembly and said bottom pre-heat coil assembly, respectively, and a media outlet conduit connecting said second compartment is capable of passing through and extending from said hollow region between said separate heat coil assembly and said bottom pre-heat coil assembly.
9. A large cryogenic evaporation plant comprising a coil arrangement for a large cryogenic evaporation plant as claimed in any one of claims 1 to 8.
10. A method of operating a large cryogenic evaporation plant as claimed in claim 9, comprising: In the equipment preheating stage, preheating medium is introduced into the bottom preheating coil pipe assembly, so that the preheating medium and the stock solution to be treated are subjected to indirect heat exchange, and the temperature of the stock solution is increased; starting the compressor system after the temperature of the stock solution reaches a preset working temperature interval; and the independent heat coil assemblies are respectively introduced with the refrigerants of the corresponding loops, the refrigerants are independently distributed through the top refrigerant distribution plate, the refrigerants exchange heat in the independent heat coil assemblies, and the fluids of the loops are independently collected through the bottom collecting plate.

Description

Coil pipe device for large-scale low-temperature evaporation equipment, large-scale low-temperature evaporation equipment and operation method Technical Field The invention relates to the technical field of heat exchange matched with low-temperature evaporation equipment, in particular to a coil pipe device for large-scale low-temperature evaporation equipment, the large-scale low-temperature evaporation equipment and an operation method. Background The low-temperature evaporation equipment is widely applied to the fields of industrial wastewater treatment, sea water desalination, high-salt waste liquid concentration and the like, and the core heat exchange component is a coil pipe structure. The large-scale low-temperature evaporation equipment is generally provided with a plurality of compressors to meet the high-power heat exchange requirement, and the refrigerant flows into a coil after being compressed by the compressors, exchanges heat with the stock solution in the equipment, and completes the evaporation and condensation cycle. The coil pipes in the existing large-scale low-temperature evaporation equipment generally adopt a single loop structure, namely, each coil pipe is usually provided with only a single inlet and a single outlet, refrigerant enters the coil pipes after being mixed in a plurality of compressor systems and completes condensation or heat exchange, and the following problems exist in practical application: the large-scale low temperature evaporation equipment is generally provided with a plurality of compressors, the refrigerant discharged by each compressor is mixed through the existing single inlet structure and then enters the coil, the refrigerant is easily unevenly distributed in each flow passage of the coil after being mixed into the coil due to the difference of the operation working condition, the exhaust capacity and the refrigerant state of each compressor, the local supercooling or overheating phenomenon is generated, the heat exchange efficiency is reduced, the load is unbalanced, meanwhile, the independent regulation and control of the corresponding refrigerant loop of each compressor cannot be realized through the single coil inlet and outlet structure, and when a certain compressor needs to maintain or adjust the operation parameters, the whole system is required to be stopped, and the operation stability and the operation flexibility of the equipment are seriously influenced. Disclosure of Invention Aiming at the problems, the invention provides a coil pipe device for large-scale low-temperature evaporation equipment, the large-scale low-temperature evaporation equipment and an operation method, which can solve the problem of unbalanced load caused by uneven refrigerant distribution in the large-scale low-temperature evaporation equipment and can remarkably improve the operation stability and heat exchange efficiency of the equipment. The technical scheme is that the coil pipe device for the large-scale low-temperature evaporation equipment is characterized by comprising the following components: At least two sets of independent heat coil pipe assemblies, wherein each set of heat coil pipe assembly comprises a plurality of coil pipe layers which are arranged at intervals along the vertical direction, the coil pipe layers of different independent heat coil pipe assemblies are circularly and alternately arranged along the vertical direction, and any two adjacent coil pipe layers are respectively subordinate to different independent heat coil pipe assemblies; The top refrigerant distribution plate is arranged at the top of the independent heat coil assembly, a plurality of first compartments which are not communicated with each other are arranged in the top refrigerant distribution plate, each first compartment is respectively connected with a refrigerant inlet pipe, and each first compartment is respectively communicated with a refrigerant inlet of a different independent heat coil assembly; The bottom collecting tray is arranged below the top refrigerant distribution tray, a plurality of second compartments which are not communicated with each other are arranged in the bottom collecting tray, the refrigerant outlets of the independent heat coil assemblies are respectively connected with different second compartments, and the second compartments are respectively connected with a medium outlet pipeline; the independent thermal coil assemblies form mutually independent refrigerant flow circuits with the first compartment of the correspondingly connected top refrigerant distribution tray and the second compartment of the bottom collection tray, respectively. Further, the independent heat coil assembly comprises a heat exchange coil, a supercooling coil and an intermediate refrigerant redistribution tray, wherein the heat exchange coil is arranged at the upper part of the independent heat coil assembly, and the supercooling coil is arranged at the lower part of the indep