CN213811207U

CN213811207U - Configuration system of centralized refrigerating unit of power plant

Info

Publication number: CN213811207U
Application number: CN202021821585.0U
Authority: CN
Inventors: 代华松; 吴振凌; 解明亮; 浦绍旭; 吕刚; 伍波
Original assignee: Guangdong Huadian Shaoguan Thermal Power Co ltd
Current assignee: Guangdong Huadian Shaoguan Thermal Power Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-07-27
Anticipated expiration: 2030-08-26

Abstract

The utility model relates to a power plant centralized refrigeration unit configuration system, which comprises a lithium bromide refrigeration unit for providing cold source for air conditioning equipment and an electric compression type water chilling unit for providing cold source for production site, wherein the electric compression type water chilling unit comprises a water return pipeline, a water pump and a compressor which are sequentially communicated; a water inlet pipeline of the lithium bromide refrigerating unit is provided with a first branch pipe, and the first branch pipe is communicated between the water return pipeline and the water pump; and a water outlet pipeline of the lithium bromide refrigerating unit is provided with a second branch pipe, and the second branch pipe is communicated between the water pump and the compressor. The utility model discloses a lithium bromide refrigerating unit and motor-driven compression cooling water set combine behind the cold source, can each other be reserve, and energy-concerving and environment-protective ensures to satisfy extreme operating mode condition demand, and refrigerating unit operation mode is nimble various, can increase and decrease refrigerating unit according to equipment situation and actual need, improves system reliability greatly.

Description

Configuration system of centralized refrigerating unit of power plant

Technical Field

The utility model relates to a power plant thermodynamic system's technical field, more specifically says that it relates to a power plant centralized refrigeration unit configuration system.

Background

The reliability problem of the existing power plant central air-conditioning refrigeration system is prominent, and the safe and stable operation of a generator set is influenced. The lithium bromide water chilling unit has the advantages that heat exchange tubes of an evaporator, an absorber and a condenser are easy to scale, the heat transfer performance is reduced, and the refrigeration effect is reduced. The compression type water chilling unit has more high-speed rotating equipment, high failure rate and longer maintenance time in long-term continuous operation. The running cost is high according to seasonal changes and equipment aging conditions.

Most of power plant centralized refrigeration users are key places and core equipment, such as a control room, an electronic room, a distribution room, a relay protection room and the like, which all require constant temperature operation all the year round, otherwise system or equipment accidents are easily caused. The compression type water chilling unit has high energy consumption, the condition that the refrigeration load is not matched with the power of the compression unit exists, the power consumption of a power plant is seriously influenced by long-term operation, and the energy conservation and the consumption reduction are not facilitated. The existing power plant central air-conditioning refrigeration system has frequent faults and low reliability, which troubles the safe and economic operation of a power plant for a long time, and is forced to increase a backup air conditioner and increase energy consumption again in important places.

SUMMERY OF THE UTILITY MODEL

The not enough to prior art exists, the utility model aims to provide a refrigerating unit configuration system is concentrated in power plant, the utility model discloses a lithium bromide refrigerating unit and motor-driven compression cooling water set combine the cold source after, can each other be reserve, and energy-concerving and environment-protective ensures to satisfy extreme operating mode condition demand, and refrigerating unit operation mode is nimble various, can increase and decrease refrigerating unit according to equipment situation and actual need, improves system reliability greatly.

The above technical purpose of the present invention can be achieved by the following technical solutions: a configuration system of a centralized refrigerating unit of a power plant comprises a lithium bromide refrigerating unit for providing a cold source for air conditioning equipment and an electric compression type water chilling unit for providing the cold source for a production site, wherein the electric compression type water chilling unit comprises a water return pipeline, a water pump and a compressor which are sequentially communicated; a water inlet pipeline of the lithium bromide refrigerating unit is provided with a first branch pipe, and the first branch pipe is communicated between the water return pipeline and the water pump; and a water outlet pipeline of the lithium bromide refrigerating unit is provided with a second branch pipe, and the second branch pipe is communicated between the water pump and the compressor.

In one embodiment, the number of the compressors is at least two, and each of the compressors is connected in parallel.

In one embodiment, a pressure gauge and a temperature gauge are sequentially arranged on the second branch pipe along the flowing direction of the liquid.

In one embodiment, the number of the water pumps is at least two, and the water pumps are connected in parallel.

In one embodiment, the lithium bromide refrigerating unit, the water pump, the compressor, the pressure gauge and the thermometer and the valves of all pipelines are in signal connection with a PLC control system respectively.

In one embodiment, the water return pipeline is communicated with a supplementary water source, and the supplementary water source is demineralized water.

In one embodiment, the water return pipeline is also communicated with low-pressure industrial extraction steam, a unit auxiliary steam source and a waste steam recovery steam source.

To sum up, the utility model discloses following beneficial effect has:

1. the utility model discloses a lithium bromide refrigerating unit and motor-driven compression cooling water set combine behind the cold source, can each other be reserve, and energy-concerving and environment-protective ensures to satisfy extreme operating mode condition demand, and refrigerating unit operation mode is nimble various, can increase and decrease refrigerating unit according to equipment situation and actual need, improves system reliability greatly.

2. The PLC control system is used for carrying out unified control, so that the number of incorporated key users can be increased. The system can maintain the water pump to be used at about 15 ℃, so that the working efficiency of the water pump is greatly improved, the vacuum degree of a unit is improved, and the efficiency of a steam turbine is improved; the electrical load of the split air conditioner can be stopped by 100kW according to the highest seasonal environment temperature, and the plant power rate is reduced during the operation of the lithium bromide unit; after the information center machine room, each laboratory and the like are connected into the system, the environment temperature requirement can be ensured, part of split air conditioner electric load is stopped, and the purchased electric quantity is effectively reduced during the operation of the lithium bromide refrigerating unit.

3. The water supply source is demineralized water to replace an independent water softening system, so that the scaling condition of the chilled water system can be effectively and reliably improved, the heat exchange efficiency is improved, and the maintenance workload is reduced.

4. The water return pipeline is connected with a low-pressure industrial extraction steam source, a unit auxiliary steam source, a waste steam recovery steam source and the like to serve as steam sources, so that the reliability of the steam source of the lithium bromide refrigerating unit is improved; on the other hand, the access of the steam source of the exhaust steam effectively realizes the deep utilization of the exhaust steam of the power plant.

Drawings

Fig. 1 is a schematic structural diagram of a configuration system of a central refrigeration unit in a power plant of the present invention.

In the figure: the system comprises a lithium bromide refrigerating unit 1, an electric compression type water chilling unit 2, a water return pipeline 3, a water pump 4, a compressor 5, a first branch pipe 6, a second branch pipe 7, a pressure gauge 8 and a thermometer 9.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.

As shown in fig. 1, a power plant centralized refrigeration unit configuration system comprises a lithium bromide refrigeration unit 1 for providing a cold source for air conditioning equipment and an electric compression type water chilling unit 2 for providing the cold source for a production site, wherein the electric compression type water chilling unit 2 comprises a water return pipeline 3, a water pump 4 and a compressor 5 which are sequentially communicated; a water inlet pipeline of the lithium bromide refrigerating unit 1 is provided with a first branch pipe 6, and the first branch pipe 6 is communicated between the water return pipeline 3 and the water pump 4; and a second branch pipe 7 is arranged on a water outlet pipeline of the lithium bromide refrigerating unit 1, and the second branch pipe 7 is communicated between the water pump 4 and the compressor 5. The utility model discloses mainly to power generation trade ubiquitous central air conditioning refrigerating system's reliability, economic nature scheduling problem, through work such as optimizing power plant's refrigerating unit configuration, cold source operation mode adjustment and thermodynamic system cold source selection, propose the optimal design and reform transform the main building and concentrate refrigeration cold source and thermodynamic system cold source configuration. The utility model discloses a lithium

bromide refrigerating unit

1 and 2 combination cold sources of motor-driven compression cooling water set back, can be for reserve each other, and energy-concerving and environment-protective ensures to satisfy extreme operating mode condition demand, and the refrigerating unit operation mode is nimble various, can increase and decrease refrigerating unit according to equipment situation and actual need, improves system reliability greatly. The utility model discloses normally, during operation adopt lithium bromide refrigerating unit 1 basically to and adopt the compressor 5 of motor-driven compression cooling water set 2, form complementarily between each other, thereby it provides sufficient cold source to last air conditioning equipment and the production site for office building etc. has alleviateed the burden that water pump 4 often functions, only when the special circumstances need further provide the cold source in a large number, reopen and use water pump 4, in order to increase the circulation dynamics, thereby reach required refrigeration requirement.

In the present embodiment, the number of the compressors 5 is three, and the compressors 5 are connected in parallel. The compressor 5 is used for electric compression refrigeration, and cold water is connected due to the fact that the second branch pipe 7 on the water outlet pipeline of the lithium bromide refrigeration unit 1 is connected, so that the temperature difference change of compression refrigeration is reduced, and the burden of the compressor 5 which needs to consume large energy to operate is relieved. And the adjustable range is enlarged by connecting a plurality of compressors 5 in parallel, the condition that the refrigeration load is not matched with the power of the compressor set is avoided, different compressors 5 can be selectively used after long-term operation, the power consumption rate of a power plant is not influenced, and the energy conservation and the consumption reduction are facilitated. The second branch pipe 7 is sequentially provided with a pressure gauge 8 and a thermometer 9 along the flowing direction of liquid, the compressor 5 can be selected in real time according to the change of the pressure gauge 8 and the thermometer 9, and a better energy-saving effect is achieved. The number of the water pumps 4 is three, and the water pumps 4 are connected in parallel. The water pump 4 is used for accelerating circulation, and simultaneously is matched with the compressor 5 for compression refrigeration, and can be stopped properly after being connected into the lithium bromide refrigerating unit 1, so that a cold source provided by a water outlet pipeline of the lithium bromide refrigerating unit 1 is directly utilized, and the operation burden of the water pump 4 is reduced. When the water pumps 4 are needed to accelerate the flowing circulation, the multiple water pumps 4 connected in parallel can be selected according to actual conditions, so that the adaptability of the water pumps can be adjusted, more high-speed rotating equipment is avoided, and the problems of high failure rate, long overhauling time and the like in long-term continuous operation are avoided.

In the embodiment, the lithium bromide refrigerating unit 1, the water pump 4, the compressor 5, the pressure gauge 8, the thermometer 9 and the valves of the pipelines are respectively in signal connection with the PLC control system. The PLC control system is used for carrying out unified control, so that the number of incorporated key users can be increased. When the water pump 4 needs to be additionally used, the water pump 4 can be selectively maintained to be used at about 15 ℃, so that the working efficiency of the water pump is greatly improved, the vacuum degree of a unit is improved, and the efficiency of a steam turbine is improved; the electrical load of the split air conditioner can be stopped by 100kW according to the highest seasonal environment temperature, and the plant power rate is reduced during the operation of the lithium bromide unit; after the information center machine room, each laboratory and the like are connected into the system, the environment temperature requirement can be ensured, part of split air conditioner electric load is stopped, and the purchased electric quantity is effectively reduced during the operation of the lithium bromide refrigerating unit.

In this embodiment, the water return pipe 3 is communicated with a supplementary water source, and the supplementary water source is demineralized water. The water supply source is demineralized water to replace an independent water softening system, so that the scaling condition of the chilled water system can be effectively and reliably improved, the heat exchange efficiency is improved, and the maintenance workload is reduced. The water return pipeline 3 is also communicated with a low-pressure industrial extraction steam source, a unit auxiliary steam source and a waste steam recovery steam source. Low-pressure industrial extraction steam, a unit auxiliary steam source, a waste steam recovery steam source and the like are used as steam sources, so that the reliability of the steam source of the lithium bromide refrigerating unit is improved on one hand; on the other hand, the access of the steam source of the exhaust steam effectively realizes the deep utilization of the exhaust steam of the power plant.

The utility model discloses a theory of operation does: the lithium bromide refrigerating unit 1 and the electric compression type water chilling unit 2 are used in a combined mode, cold water output by the lithium bromide refrigerating unit 1 is provided for air conditioning equipment such as office buildings and comprehensive buildings, the cold water is sent to the compressor 5 of the electric compression type water chilling unit 2 through the second branch pipe 7, and the cold water output by the lithium bromide refrigerating unit 1 can be conveyed to a production site to be used as a cold source of a key user only through further compression refrigeration with low power through the compressor 5. Then the steam passes through a water return pipeline 3, and steam sources such as supplementing desalted water and recycling exhaust steam are introduced into the lithium bromide refrigerating unit 1 through the first branch pipe 6 again to realize circulation. When a cold source with higher power is needed to be input in a production site, the water pump 4 can be properly started, the internal circulation of the system is accelerated, the power of the lithium bromide refrigerating unit 1 and the power of the compressor 5 are increased, the production efficiency of the cold source is further improved, and special conditions such as multi-equipment starting, high temperature and the like in the production site can be met.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A power plant centralized refrigeration unit configuration system comprises a lithium bromide refrigeration unit (1) for providing a cold source for air conditioning equipment and an electric compression type water chilling unit (2) for providing the cold source for a production site, and is characterized in that the electric compression type water chilling unit (2) comprises a water return pipeline (3), a water pump (4) and a compressor (5) which are sequentially communicated; a first branch pipe (6) is arranged on a water inlet pipeline of the lithium bromide refrigerating unit (1), and the first branch pipe (6) is communicated between the water return pipeline (3) and the water pump (4); and a water outlet pipeline of the lithium bromide refrigerating unit (1) is provided with a second branch pipe (7), and the second branch pipe (7) is communicated between the water pump (4) and the compressor (5).

2. The power plant concentrated refrigerant unit arrangement as claimed in claim 1, wherein said number of compressors (5) is at least two, and each of said compressors (5) is connected in parallel.

3. The power plant concentrated refrigeration unit arrangement system according to claim 2, wherein the second branch pipe (7) is provided with a pressure gauge (8) and a temperature gauge (9) in sequence along the flow direction of the liquid.

4. The power plant concentrated refrigeration unit configuration system according to claim 1, wherein the number of the water pumps (4) is at least two, and each of the water pumps (4) is connected in parallel.

5. The power plant concentrated refrigeration unit configuration system according to claim 3, wherein the lithium bromide refrigeration unit (1), the water pump (4), the compressor (5), the pressure gauge (8), the temperature gauge (9) and the valves of the pipes are in signal connection with the PLC control system respectively.

6. The power plant concentrated refrigeration unit configuration system according to any one of claims 1 to 5, wherein the water return pipe (3) is communicated with a supplementary water source, and the supplementary water source is desalted water.

7. The power plant concentrated refrigeration unit configuration system according to claim 6, wherein the water return pipe (3) is further communicated with a low-pressure industrial steam extraction, a unit auxiliary steam source and a waste steam recovery steam source.