CN219494893U - Device for recovering energy of direct-current cooling water system - Google Patents
Device for recovering energy of direct-current cooling water system Download PDFInfo
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- CN219494893U CN219494893U CN202320695631.4U CN202320695631U CN219494893U CN 219494893 U CN219494893 U CN 219494893U CN 202320695631 U CN202320695631 U CN 202320695631U CN 219494893 U CN219494893 U CN 219494893U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The utility model discloses a device for recycling energy of a direct-current cooling water system, which comprises a water supply main pipe, wherein the water inlet end of the water supply main pipe is connected with a water outlet of a water pump group, two groups of water supply pipelines are arranged at the water outlet end of the water supply main pipe in parallel, the first water supply pipeline is connected with the water inlet side of a condenser, three groups of water outlet pipelines are arranged at the water outlet side of the condenser in parallel, the water outlet pipelines are respectively a main pipeline of a water turbine generator set, a bypass pipeline of the water turbine generator set and a secondary heat exchange pipeline, the main pipeline of the water turbine generator set is connected with a water inlet pipe of the water turbine generator set, the secondary heat exchange pipeline and the second water supply pipeline are both connected with a plate heat exchanger to provide a cooling water source, and the plate heat exchanger is also connected with a closed desalination water cooling system.
Description
Technical Field
The utility model belongs to the technical field of cooling water systems, and particularly relates to a device for recovering energy of a direct-current cooling water system.
Background
In the industrial production process, a direct-current cooling water system is adopted by a part of large petrochemical enterprises in China, and rivers, lakes and seas are taken as water taking sources to cool heat exchange equipment, so that the consumption of fresh water resources is effectively reduced, and the investment of equipment such as a cooling tower is saved. Taking a seawater source as an example, in a traditional direct-current cooling system, a water taking pump is used for taking seawater from the water source, pressurizing and then conveying the seawater to a seawater condenser for heat exchange, and then directly discharging the seawater to the sea area, on one hand, the height of an outlet pipe of the seawater condenser is often more than 10 meters and even higher, so that the water discharge is often provided with larger potential energy, and a water discharge valve at the seawater outlet side of the condenser cannot be fully opened, so that larger resistance exists at the water discharge valve, and energy waste is caused; on the other hand, the water temperature is still lower after the seawater is subjected to primary heat exchange for the seasonal reasons in part of the month of the year, and great cold waste exists in the process of discharging the seawater after the heat exchange of the condenser. In the prior art, the hydroelectric generating set is adopted to recycle the residual pressure energy at the outlet of the heat exchange equipment, but the technology only recycles the abundant pressure energy, but does not recycle the abundant cold energy, and the problems of single energy recycling mode and low recycling efficiency still exist.
Disclosure of Invention
The utility model aims to provide a device for recovering energy of a direct-current cooling water system, which solves the problems of single energy recovery mode and low recovery and utilization efficiency in the prior art.
The technical scheme includes that the device for recycling energy of the direct-current cooling water system comprises a water supply main pipe, wherein the water inlet end of the water supply main pipe is connected with a water outlet of a water pump set, the water outlet end of the water supply main pipe is provided with two groups of water supply pipelines in parallel, the water supply main pipe is connected with the water inlet side of a condenser, the water outlet side of the condenser is provided with three groups of water outlet pipelines in parallel, the three groups of water supply pipelines are respectively a main pipeline of a hydroelectric generating set, a bypass pipeline of the hydroelectric generating set and a secondary heat exchange pipeline, the main pipeline of the hydroelectric generating set is connected with a water inlet pipe of the hydroelectric generating set, the secondary heat exchange pipeline and the second water supply pipeline are both connected with a plate heat exchanger to provide a cooling water source, and the plate heat exchanger is also connected with a closed desalination water cooling system.
The present utility model is also characterized in that,
the water inlet of the water pump group is connected with the water taking well through a pipeline, and the water outlet pipe of the water turbine generator set and the bypass pipeline of the water turbine generator set are respectively connected to the drainage canal.
An inlet regulating valve is arranged on the main pipeline of the inlet of the hydroelectric generating set, and a bypass regulating valve is arranged on the bypass pipeline of the hydroelectric generating set.
The plate heat exchanger comprises a cooling water inlet pipe, a cooling water outlet pipe, a desalted water return pipe and a desalted water outlet pipe, wherein the cooling water inlet pipe is respectively connected with a second water supply pipeline and a secondary heat exchange pipeline, and the cooling water outlet pipe is connected to the drainage canal.
The second water supply pipeline is provided with a plate heat exchange main water supply valve, the secondary heat exchange water supply valve is arranged on the secondary heat exchange pipeline, and the cooling water outlet pipe is provided with a cooling water drain valve.
The closed desalination water cooling system comprises a circulating water pump set, a water inlet of the circulating water pump set is connected with a desalted water outlet pipe, a water outlet of the circulating water pump set is connected with a heat exchange area of the production device through a pipeline, and a water outlet of a replacement hot area of the production device is connected with a desalted water return pipe.
The desalted water outlet pipe is also provided with a pressure-stabilizing water supplementing tank.
The hydroelectric generating set adopts an impulse turbine or a reaction turbine.
The device for recycling the energy of the direct-current cooling water system has the beneficial effects that the water turbine generator set and the plate heat exchanger are arranged on the water outlet side of the condenser in parallel, the plate heat exchanger is connected with the closed desalination water cooling system, two operation modes are correspondingly designed according to the temperature of a water source, when the temperature of the water source is higher, the device operates in a mode of 'power generation by residual pressure of the seawater drainage of the condenser', so that the residual pressure of the water drainage of the condenser is recycled, the residual pressure is utilized for power generation, when the temperature of the water source is lower, the device operates in a mode of 'providing a cold source for the closed desalination water cooling system by the seawater drainage of the condenser', so that the residual pressure and the abundant cold energy of the water drainage of the condenser are recycled in double mode, and the recycling efficiency of the energy is further improved through the switching of the two modes.
Drawings
Fig. 1 is a schematic structural view of an apparatus for energy recovery of a once-through cooling water system according to the present utility model.
In the figure, 1 a water intake well, 2 a water pump set, 3 a water supply main pipe, 301 a first water supply pipeline, 302 a second water supply pipeline, 4 a condenser, 401 a main pipeline of a hydroelectric generating set, 402 a bypass pipeline of the hydroelectric generating set, 403 a secondary heat exchange pipeline, 5 a hydroelectric generating set, 6 a drainage channel, 7 a plate heat exchanger, 701 a cooling water inlet pipe, 702 a cooling water outlet pipe, 703 a desalted water return pipe, 704 a desalted water outlet pipe, 8 a pressure stabilizing water supplementing tank, 9 a circulating water pump set, 10 a production device replacement hot zone, 11 an inlet regulating valve, 12 a bypass regulating valve, 13 a plate heat exchange main water supply valve, 14 a secondary heat exchange water supply valve and 15 a cooling water drain valve.
Detailed Description
The utility model will be described in detail below with reference to the drawings and the detailed description.
The utility model relates to a structure of an energy recovery device for a direct-current cooling water system, which is shown in fig. 1, and comprises a water supply main pipe 3, wherein the water inlet end of the water supply main pipe 3 is connected with the water outlet of a water pump group 2, the water outlet end of the water supply main pipe 3 is provided with two groups of water supply pipelines in parallel, namely a first water supply pipeline 301 and a second water supply pipeline 302, respectively, the first water supply pipeline 301 is connected with the water inlet side of a condenser 4, the water outlet side of the condenser 4 is provided with three groups of water outlet pipelines in parallel, namely a main pipeline 401 of a water turbine generator set, a bypass pipeline 402 of the water turbine generator set and a secondary heat exchange pipeline 403, the main pipeline 401 of the water turbine generator set is connected with the water inlet pipe of a water turbine generator set 5, the secondary heat exchange pipeline 403 and the second water supply pipeline 302 are both connected with a plate heat exchanger 7 to provide a cooling water source, and the plate heat exchanger 7 is also connected with a closed desalination water cooling system.
The water inlet of the water pump set 2 is connected with the water intake well 1 through a pipeline, the water outlet pipe of the water turbine generator set 5 and the water turbine generator set bypass pipeline 402 are respectively connected to the drainage channel 6, and in order to facilitate switching and adjustment, the water turbine generator set main pipeline 401 is provided with an inlet regulating valve 11, and the water turbine generator set bypass pipeline 402 is provided with a bypass regulating valve 12.
The plate heat exchanger 7 includes a cooling water inlet pipe 701, a cooling water outlet pipe 702, a desalted water return pipe 703 and a desalted water outlet pipe 704, the cooling water inlet pipe 701 is connected with the second water supply pipe 302 and the secondary heat exchange pipe 403, respectively, and the cooling water outlet pipe 702 is connected to the drain 6. In order to facilitate the switching and the adjustment, the plate heat exchange main water supply valve 13 is arranged on the second water supply pipeline 302, the secondary heat exchange water supply valve 14 is arranged on the secondary heat exchange pipeline 403, and the cooling water drain valve 15 is arranged on the cooling water outlet pipe 702. The utility model is connected with the plate heat exchanger 7 behind the condenser 4, can effectively recycle residual pressure, simultaneously provides cold sources for the closed desalted water cooling system, greatly reduces the number of water pumps of the water pump group 2, obtains larger electricity-saving benefit, and ensures that the cold source supply of the closed desalted water cooling system almost runs with zero electricity consumption.
The closed desalination water cooling system comprises a circulating water pump set 9, wherein a water inlet of the circulating water pump set 9 is connected with a desalted water outlet pipe 704, a water outlet of the circulating water pump set 9 is connected with a production equipment replacement hot zone 10 through a pipeline, and a water outlet of the production equipment replacement hot zone 10 is connected with a desalted water return pipe 703. In order to maintain the stable pressure of the closed desalination water cooling system and meet the water supplementing requirement of the system, the utility model is also provided with a pressure stabilizing and supplementing tank 8 on the desalted water outlet pipe 704 at the water inlet side of the circulating water pump set 9.
The hydro-generator set 5 adopts an impulse turbine or a reaction turbine. In the traditional seawater direct current cooling system process, on one hand, the height of an outlet pipe at the water outlet side of the condenser 4 is often more than 10 meters and even higher, and on the other hand, in order to avoid the problems of air blockage or equipment vibration and the like caused by overlarge negative pressure, the drain valve at the water outlet side of the condenser 4 is often unable to realize full opening. Based on the problems, the hydraulic generator set 5 is adopted to replace the drain valve adopted in the traditional seawater direct-current cooling system process, and the hydraulic generator set 5 is used for generating power by the residual pressure of the seawater drainage of the condenser in the period of higher seawater temperature all the year round, so that the opening and closing regulation effect of the original drain valve can be realized, the resistance consumed at the drain valve can be effectively recovered under the condition that the operation parameters of the condenser 4 are not influenced, and the larger power generation benefit is obtained.
The device for recovering the energy of the direct-current cooling water system can be suitable for various water sources such as rivers, lakes and seas, and takes seawater as an example, and the working principle of the device for recovering the energy of the direct-current cooling water system is as follows:
according to the device for energy recovery of the direct-current cooling water system, water is taken from the water taking well 1, pressurized by the water pump group 2 and enters the water supply main pipe 3, the device operates in a mode of 'condenser seawater drainage residual pressure power generation' in a period of higher seawater temperature all the year round, under the working condition, the first water supply pipeline 301 of the water supply main pipe 3 supplies water to the condenser 4, the drainage of the condenser 4 is conveyed to the water turbine generator group 5 by the water turbine generator group main pipeline 401, the water turbine generator group 5 converts hydraulic energy into mechanical energy and then into electric energy to realize a power generation function, then seawater is discharged to the drainage canal 6 and finally flows into the sea, at the moment, the inlet regulating valve 11 is in a fully opened state, the bypass regulating valve 12 is in a fully closed state, and the outlet pressure of the water outlet side of the condenser 4 is zero pressure or micro positive pressure; when the hydroelectric generating set 5 breaks down, the hydroelectric generating set 5 can be cut out rapidly, at the moment, the inlet regulating valve 11 is closed, the bypass regulating valve 12 is opened synchronously for a certain opening degree, the seawater is regulated to the state that the outlet pressure and the water quantity of the water outlet side of the condenser 4 are the same as those before switching, the seawater is discharged from the bypass pipeline 402 of the hydroelectric generating set to the water discharge channel 6 and finally flows into the sea, at the moment, the secondary heat exchange water supply valve 14 is closed, the plate heat exchange main water supply valve 13 and the cooling water discharge valve 15 are opened, the cooling water side of the plate heat exchanger 7 of the closed desalination water cooling system is supplied with water by the second water supply pipeline 302, and is discharged to the water discharge channel 6 after heat exchange of the plate heat exchanger 7, and finally flows into the sea.
In the period of lower seawater temperature all the year around, the operation is performed in a mode that 'condenser seawater drainage provides a cold source for a closed desalted water cooling system', under the working condition, the hydroelectric generating set 5 is stopped, the inlet regulating valve 11 and the bypass regulating valve 12 are closed, the first water supply pipeline 301 of the main water supply pipe 3 supplies water to the condenser 4, the drainage of the condenser 4 is conveyed to the cooling water inlet pipe 701 of the plate heat exchanger 7 by the secondary heat exchange pipeline 403, and is discharged to the drainage canal 6 by the cooling water outlet pipe 702 after heat exchange of the plate heat exchanger 7, and finally flows into the sea. Meanwhile, desalted water cooled by the plate heat exchanger 7 is conveyed to the circulating water pump set 9 through the desalted water outlet pipe 704, pressurized by the circulating water pump set 9 and conveyed to the production device replacement hot zone 10, and after the plurality of heat exchangers in the production device replacement hot zone 10 are cooled by the desalted water, the high-temperature desalted water returns to the plate heat exchanger 7 through the desalted water return pipe 703 to complete one desalted water cooling cycle.
In addition, the utility model further calculates the energy saving condition of the device for recovering the energy of the direct-current cooling water system, and the energy saving condition is illustrated by taking the sea area of Zhejiang Zheshan in 2022 as an example because the time period of the temperature of the seawater in the whole year varies according to the sea area. The annual sea water temperature in the sea area is 7.9-29.5 ℃, the sea water temperature in 2 months is the lowest, and the sea water temperature in 8 months is the highest. Taking the maximum temperature difference of the seawater of the condenser 4 into consideration to be 8-10 ℃, and taking a certain allowance into consideration, namely, the operation can be performed according to a mode of 'condenser seawater drainage residual pressure power generation' above the seawater temperature of 18 ℃, according to statistics, the operation time of the mode can be estimated to be up to 6.5 months, the operation time is calculated by the set metering of the condenser seawater of 30000m < 3 >/h, and the power generation can be performed at about 320 ten thousand degrees in a single operation period; the operation can be performed according to the mode that the condenser seawater drainage provides a cold source for a closed desalted water cooling system below the seawater temperature of 18 ℃, the maximum temperature of the condenser seawater outlet is not more than 28 ℃, the heat exchange requirement of a heat exchanger area of a production device is completely met, the operation time of the mode can be estimated to be 5.5 months, the electricity can be saved by about 1300 ten thousand degrees in a single operation period, namely the total annual energy saving/generating capacity of the two modes is about 1620 ten thousand degrees, and the high-efficiency utilization of energy is realized.
In summary, compared with the traditional seawater direct cooling system process, the device for recovering the energy of the direct cooling water system comprises two operation modes, when the water source temperature is higher, the device is operated in a mode of 'condenser seawater drainage residual pressure power generation', so that the residual pressure of condenser drainage is recovered, and the residual pressure is utilized to generate power; when the water source temperature is lower, the mode operation of taking the condenser seawater drainage as a closed desalted water cooling system to provide a cold source is adopted, so that the residual pressure and the abundant cold quantity of the condenser drainage are recycled, and the energy recycling efficiency is further improved through the switching of the two modes.
Claims (8)
1. The device for recycling energy of the direct-current cooling water system is characterized by comprising a water supply main pipe (3), a water inlet end of the water supply main pipe (3) is connected with a water outlet of a water pump set (2), two groups of water supply pipelines are arranged at a water outlet end of the water supply main pipe (3) in parallel, a first water supply pipeline (301) and a second water supply pipeline (302) are respectively arranged, the first water supply pipeline (301) is connected with a water inlet side of a condenser (4), three groups of water outlet pipelines are arranged at a water outlet side of the condenser (4) in parallel, the three groups of water outlet pipelines are respectively a main pipeline (401) of the water turbine generator set, a bypass pipeline (402) of the water turbine generator set and a secondary heat exchange pipeline (403), the main pipeline (401) of the water turbine generator set is connected with a water inlet pipe of a water turbine generator set (5), the secondary heat exchange pipeline (403) and the second water supply pipeline (302) are both connected with a plate heat exchanger (7) to provide a cooling water source, and the plate heat exchanger (7) is also connected with a closed desalination water cooling system.
2. The device for energy recovery of a direct current cooling water system according to claim 1, wherein the water inlet of the water pump set (2) is connected with the water intake well (1) through a pipeline, and the water outlet pipe of the water turbine generator set (5) and the water turbine generator set bypass pipeline (402) are respectively connected to the water drainage channel (6).
3. The device for energy recovery of a direct current cooling water system according to claim 1, wherein an inlet regulating valve (11) is arranged on a main pipeline (401) of the water turbine generator set, and a bypass regulating valve (12) is arranged on a bypass pipeline (402) of the water turbine generator set.
4. The device for energy recovery of a once-through cooling water system according to claim 1, characterized in that the plate heat exchanger (7) comprises a cooling water inlet pipe (701), a cooling water outlet pipe (702), a desalted water return pipe (703) and a desalted water outlet pipe (704), the cooling water inlet pipe (701) being connected to the second water supply pipe (302) and the secondary heat exchange pipe (403), respectively, the cooling water outlet pipe (702) being connected to the water drain (6).
5. The device for energy recovery of a once-through cooling water system according to claim 4, wherein a plate heat exchange main water supply valve (13) is provided on the second water supply line (302), a secondary heat exchange water supply valve (14) is provided on the secondary heat exchange line (403), and a cooling water drain valve (15) is provided on the cooling water outlet pipe (702).
6. The device for energy recovery of a direct current cooling water system according to claim 4, wherein the closed desalination water cooling system comprises a circulating water pump set (9), a water inlet of the circulating water pump set (9) is connected with a desalted water outlet pipe (704), a water outlet of the circulating water pump set (9) is connected with a production equipment replacement hot zone (10) through a pipeline, and a water outlet of the production equipment replacement hot zone (10) is connected with a desalted water return pipe (703).
7. The device for energy recovery of a direct current cooling water system according to claim 6, wherein a pressure stabilizing water supplementing tank (8) is further arranged on the desalted water outlet pipe (704).
8. Device for energy recovery of a once-through cooling water system according to any of claims 1-7, characterized in that the hydro-generator set (5) employs a impulse turbine or a counter-impulse turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320695631.4U CN219494893U (en) | 2023-03-31 | 2023-03-31 | Device for recovering energy of direct-current cooling water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320695631.4U CN219494893U (en) | 2023-03-31 | 2023-03-31 | Device for recovering energy of direct-current cooling water system |
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| Publication Number | Publication Date |
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| CN219494893U true CN219494893U (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320695631.4U Active CN219494893U (en) | 2023-03-31 | 2023-03-31 | Device for recovering energy of direct-current cooling water system |
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| CN (1) | CN219494893U (en) |
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- 2023-03-31 CN CN202320695631.4U patent/CN219494893U/en active Active
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