Desalted water cooling circulation device for polyester waste heat power generation

Abstract

The utility model discloses a demineralized water cooling circulating device for polyester waste heat power generation, which comprises a demineralized water head tank, a water quality processor, a demineralized water circulating pump, a heat exchanger and a cold medium mechanism, and the cold medium mechanism comprises a water cooling tower and a cold medium circulating pump; the cold medium circulating pumps comprise the first cold medium circulating pump, the second cold medium circulating pump and the third cold medium circulating pump. Demineralized water serves as a cooling medium of the condenser, scaling of the medium on a copper pipe is reduced, and the frequency of disassembling and washing the copper pipe of the condenser is greatly reduced; direct heat exchange is provided for the condenser through the cooling circulation device, desalted water is recycled, continuity and stability of cooling water supply are guaranteed, and normal operation of a refrigerating system is prevented from being affected by water pressure fluctuation and the like. And in the circulating device, the demineralized water is repeatedly used, and the mineral concentration in the water is gradually reduced along with circulation.

Description

Technical Field

[0001] This utility model relates to the field of polyester production, specifically to a demineralized water cooling circulation device for polyester waste heat power generation. Background Technology

[0002] ORC waste heat power generation units are devices that recover and utilize the low-temperature waste heat from polyester esterification steam, converting thermal energy into electrical energy. Using ORC turbine generator sets enables the recovery of low-temperature heat energy, improving energy utilization efficiency, saving energy, and reducing energy waste. The ORC waste heat power generation unit includes a heat exchanger, generator set, working fluid pump, and condenser. Esterification steam heats the organic working fluid in the evaporator of the ORC generator set. The heated organic working fluid forms steam at a certain pressure, driving the turbine to perform work and powering the generator. After performing work, the organic working fluid enters the condenser and is condensed into a liquid state by circulating cooling water. The liquid working fluid is then pressurized by the working fluid pump and sent through the evaporator preheating section to the flooded evaporation section.

[0003] In the condenser of an ORC waste heat power generation unit, the heat exchange between the organic working fluid vapor and the cooling water is transferred through the walls of the cooling water pipes. The surface smoothness and heat transfer performance of the copper pipes directly affect the power generation capacity of the generator set. However, in existing technologies, pure water is used as the cooling water in the condenser. The calcium and magnesium ions in the water easily cause scale formation on the inner walls of the copper pipes, affecting their heat transfer performance. Cleaning the copper pipes usually requires shutdown, which also affects the continuous operation and power generation of the ORC system. To prevent scale formation on the copper pipes, demineralized water is usually used as the cooling medium. However, although demineralized water has a low salt content, it still contains certain minerals and impurities, and direct introduction may still lead to scale formation on the inner walls of the condenser. Furthermore, the demineralized water in the condenser absorbs a large amount of heat and cannot be reused, resulting in resource waste. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a demineralized water cooling circulation device for polyester waste heat power generation, which not only solves the problem of easy scaling in the condenser but also recycles the demineralized water.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A demineralized water cooling circulation device for polyester waste heat power generation includes a demineralized water high-level tank, a water quality processor, a demineralized water circulation pump, a heat exchanger, and a cooling medium mechanism. The water quality processor includes a first water quality processor and a second water quality processor. One end of the outlet of the demineralized water high-level tank is connected to the inlet of the condenser through the first water quality processor, and the other end of the outlet of the demineralized water high-level tank is connected to the inlet of the demineralized water circulation pump through the second water quality processor. The outlet of the demineralized water circulation pump is connected to the demineralized water inlet of the heat exchanger.

[0007] The demineralized water outlet of the heat exchanger is connected to the water inlet of the condenser, and the water outlet of the condenser is connected to the cooling outlet of the heat exchanger.

[0008] The cooling medium mechanism includes a cooling tower and a cooling medium circulation pump. The outlet of the cooling tower is connected to the cooling medium inlet of the heat exchanger, and the inlet of the cooling tower is connected to the cooling medium outlet of the heat exchanger through the cooling medium circulation pump.

[0009] Preferably, the heat exchanger includes a first heat exchanger, a second heat exchanger, and a third heat exchanger, which are interconnected.

[0010] Preferably, the demineralized water circulation pump includes a first demineralized water circulation pump and a second demineralized water circulation pump. The inlets of the first and second demineralized water circulation pumps are connected to the demineralized water high-level tank through the second water quality processor, and the outlets of the first and second demineralized water circulation pumps are connected to the demineralized water inlet of the heat exchanger.

[0011] Preferably, the demineralized water outlet of the first heat exchanger is connected to the water inlet of the condenser.

[0012] Preferably, the outlet of the cooling tower is connected to the cold medium inlet of the first heat exchanger, the second heat exchanger and the third heat exchanger respectively, and the cold medium outlet of the first heat exchanger, the second heat exchanger and the third heat exchanger is connected to the inlet of the cooling tower through the cold medium circulation pump.

[0013] Preferably, the cooling medium is pure water.

[0014] Preferably, the first heat exchanger, the second heat exchanger, and the third heat exchanger are plate heat exchangers.

[0015] Preferably, the cold medium circulation pump includes a first cold medium circulation pump, a second cold medium circulation pump, and a third cold medium circulation pump, which are interconnected.

[0016] This utility model has the following advantages and beneficial effects compared to the prior art:

[0017] (1) This utility model discloses a demineralized water cooling circulation device for polyester waste heat power generation. The demineralized water is used as the cooling medium of the condenser, which reduces the scaling of the medium on the copper tubes and greatly reduces the frequency of disassembly and cleaning of the condenser copper tubes. The cooling circulation device provides direct heat exchange to the condenser, realizes the recycling of demineralized water, ensures the continuity and stability of the cooling water supply, and avoids the normal operation of the refrigeration system due to water pressure fluctuations. A water quality processor is set in the circulation device to further reduce the salt content of the demineralized water and reduce the possibility of scaling. The demineralized water is repeatedly used in the device, and the salt concentration in the water will gradually decrease as the circulation proceeds.

[0018] (2) The present invention is equipped with a high-level demineralized water tank to replenish the water loss of the demineralized water circulation pipeline and ensure that the mineral content in the cooling circulation device is kept at a low level.

[0019] (3) The device disclosed in this utility model effectively isolates the descaling agent, organic acid, reverse osmosis antiscaling agent and other drugs that need to be added during online addition and generator shutdown cleaning, avoiding corrosion of the condenser copper tube and ensuring the long-term stable operation of the power generation device.

[0020] (4) This utility model is equipped with three plate heat exchangers. When the condenser inlet water temperature is high due to scaling of the plate heat exchangers, only the plate heat exchangers need to be switched and cleaned. There is no need to shut down the generator for cleaning, so as to avoid unnecessary waste of equipment and steam resources. In addition, the three plate heat exchangers can provide a certain degree of redundancy to ensure that the system can still operate when one of the plate heat exchangers fails. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model;

[0023] The markings of the components in the attached diagram:

[0024] 1-Demineralized water high-level tank, 2-Water quality processor, 21-First water quality processor, 22-Second water quality processor, 3-Demineralized water circulation pump, 31-First demineralized water circulation pump, 32-Second demineralized water circulation pump, 4-Condenser, 5-Heat exchanger, 51-First heat exchanger, 52-Second heat exchanger, 53-Third heat exchanger, 6-Cold medium mechanism, 61-Cooling tower, 62-Cold medium circulation pump, 621-First cold medium circulation pump, 622-Second cold medium circulation pump, 623-Third cold medium circulation pump. Detailed Implementation

[0025] The invention objective of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation of this utility model is not limited to the following embodiments.

[0026] Example 1

[0027] A demineralized water cooling circulation device for polyester waste heat power generation includes a demineralized water high-level tank 1, a water quality processor 2, a demineralized water circulation pump 3, a heat exchanger 5, and a cold medium mechanism 6. The water quality processor 2 includes a first water quality processor 21 and a second water quality processor 2. The cold medium mechanism 6 includes a cooling tower 61 and a cold medium circulation pump 62. The cold medium circulation pump 62 includes a first cold medium circulation pump 621, a second cold medium circulation pump 622, and a third cold medium circulation pump 623.

[0028] The demineralized water high-level tank 1 is located at a high point on the roof. The outlet of the demineralized water high-level tank 1 is connected to the inlet of the condenser 4 through the first water quality processor 21. A demineralized water circulation pump 3 and a heat exchanger 5 are installed below it. The demineralized water circulation pump 3 includes a first demineralized water circulation pump 31 and a second demineralized water circulation pump 32. The heat exchanger 5 includes a first heat exchanger 51, a second heat exchanger 52 and a third heat exchanger 53. The heat exchanger 5 is a plate heat exchanger. The first heat exchanger 51, the second heat exchanger 52 and the third heat exchanger 53 are interconnected.

[0029] The other end of the outlet of the demineralized water high-level tank 1 is connected to the inlet of the first demineralized water circulation pump 31 and the second demineralized water circulation pump 32 through the second water quality processor 22; the outlets of the first demineralized water circulation pump 31 and the second demineralized water circulation pump 32 are connected to the demineralized water inlet of the heat exchanger 5. This is used to balance and replenish the water loss in the demineralized water circulation pipeline, and the water quality processor 2 further removes the residual salt in the demineralized water.

[0030] The condenser 4 is located above the heat exchanger 5, and the demineralized water outlet of the first heat exchanger 51 is connected to the water inlet of the condenser 4; a demineralized water cooling circulation device is used to provide direct heat exchange for the condenser 4.

[0031] The cold medium mechanism 6 is located to the right of the heat exchanger 5, and the cooling tower 61 is located above the cooling medium circulation pump. The outlet of the cooling tower 61 is connected to the cold medium inlet of the first heat exchanger 51, the second heat exchanger 52 and the third heat exchanger 53 respectively. The cold medium outlets of the first heat exchanger 51, the second heat exchanger 52 and the third heat exchanger 53 are connected to the outlet of the cooling tower 61 through the cold medium circulation pump 62.

[0032] The process is as follows:

[0033] The demineralized water in condenser 4 is heated by exchanging heat with the organic working medium during the polyester waste heat power generation process. The heated demineralized water is then transported to the cooling port of heat exchanger 5 through the outlet of condenser 4 for cooling. The heated demineralized water is then exchanged with the cold medium in the three-layer plate heat exchanger 5. The cooled demineralized water is then transported back to the inlet of condenser 4. Meanwhile, the cold medium heated in the plate heat exchanger 5 is transported to the cooling tower 61 by the cold medium circulation pump 62 for cooling. The cooled cold medium is then transported back to heat exchanger 5, thus achieving the recycling of demineralized water and cold medium.

[0034] The demineralized water high-level tank 1 further removes salt through the second water quality processor 22, and then the demineralized water is pressurized by the demineralized water circulation pump 3 and sent to the third heat exchanger 53 to replenish the water loss in the demineralized water circulation pipeline.

Claims

1. A desalinated water cooling circulation device for polyester waste heat power generation, characterized by, The device comprises a desalted water high tank (1), a water quality processor (2), a desalted water circulating pump (3), a heat exchanger (5) and a cold medium mechanism (6), the water quality processor (2) comprises a first water quality processor (21) and a second water quality processor (22), one end of the water outlet of the desalted water high tank (1) is connected with the water inlet of the condenser (4) through the first water quality processor (21), the other end of the water outlet of the desalted water high tank (1) is connected with the water inlet of the desalted water circulating pump (3) through the second water quality processor (22), the water outlet of the desalted water circulating pump (3) is connected with the desalted water inlet of the heat exchanger (5); the desalted water outlet of the heat exchanger (5) is connected with the water inlet of the condenser (4), and the water outlet of the condenser (4) is connected with the cooling outlet of the heat exchanger (5); the cold medium mechanism (6) comprises a cooling tower (61) and a cold medium circulating pump (62), the water outlet of the cooling tower (61) is connected with the cold medium inlet of the heat exchanger (5), and the water inlet of the cooling tower (61) is connected with the cold medium outlet of the heat exchanger (5) through the cold medium circulating pump (62).

2. The desalted water cooling circulation device for polyester waste heat power generation according to claim 1, characterized in that, The heat exchanger (5) comprises a first heat exchanger (51), a second heat exchanger (52) and a third heat exchanger (53), and the first heat exchanger (51), the second heat exchanger (52) and the third heat exchanger (53) are connected with each other.

3. The desalted water cooling circulation device for polyester waste heat power generation according to claim 2, characterized in that, The desalted water circulating pump (3) comprises a first desalted water circulating pump (31) and a second desalted water circulating pump (32), the water inlets of the first desalted water circulating pump (31) and the second desalted water circulating pump (32) are connected with the desalted water high tank (1) through the second water quality processor (22), and the water outlets of the first desalted water circulating pump (31) and the second desalted water circulating pump (32) are connected with the desalted water inlets of the heat exchanger (5).

4. The desalting water cooling circulation device for polyester waste heat power generation according to claim 2, characterized in that, The desalted water outlet of the first heat exchanger (51) is connected with the water inlet of the condenser (4).

5. The desalted water cooling circulation device for polyester waste heat power generation according to claim 2, characterized in that, The water outlets of the cooling tower (61) are respectively connected with the cold medium inlets of the first heat exchanger (51), the second heat exchanger (52) and the third heat exchanger (53), and the cold medium outlets of the first heat exchanger (51), the second heat exchanger (52) and the third heat exchanger (53) are connected with the water inlets of the cooling tower (61) through the cold medium circulating pump (62).

6. The desalted water cooling circulation device for polyester waste heat power generation according to claim 1, characterized in that, The cold medium is pure water.

7. The desalted water cooling circulation device for polyester waste heat power generation according to claim 2, characterized by, The first heat exchanger (51), the second heat exchanger (52) and the third heat exchanger (53) are plate heat exchangers.

8. The desalted water cooling circulation device for polyester waste heat power generation according to claim 1, characterized in that, The cold medium circulating pump (62) comprises a first cold medium circulating pump (621), a second cold medium circulating pump (622) and a third cold medium circulating pump (623), and the first cold medium circulating pump (621), the second cold medium circulating pump (622) and the third cold medium circulating pump (623) are connected with each other.

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