Double-cooling-station integrated system

Abstract

The invention relates to the technical field of coking refrigeration, in particular to a double-cooling-station integrated system which is characterized by comprising a 1 # refrigerator, a 2 # refrigerator, a 1 # cooling tower and a 2 # cooling tower, and the 1 # refrigerator, the 2 # refrigerator, the 1 # cooling tower and the 2 # cooling tower are each of a redundant arrangement structure with one opened cooling tower and one standby cooling tower. The 1 # refrigerating machine or the 2 # refrigerating machine and the 1 # cooling tower or the 2 # cooling tower are respectively connected with the integrated control system and the end user to form a linkage control structure; in summer, the refrigerator is connected with the cooling tower in series, and in non-summer, the refrigerator is switched out, and the cooling tower works independently. Compared with the prior art, the invention has the following beneficial effects: 1) the integrated design realizes cooperative control between equipment, optimizes equipment operation parameters, and improves the energy utilization rate; 2) intelligent control is realized, real-time observation of the operation state of the equipment is realized, and the operation and production efficiency of the station building is improved; and (3) energy is saved, carbon is reduced, efficient utilization of energy is achieved, carbon emission is reduced, and the effects of energy conservation and carbon reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of coking refrigeration, and particularly to a dual-cooling station integrated system that provides low-temperature water in summer and circulating cooling water in non-summer seasons. Background Art

[0002] In the coking project, some equipment in the chemical gas purification unit requires low-temperature water during summer operation and circulating cooling water during winter operation. The low-temperature water is provided by the refrigeration station, and the circulating cooling water required for refrigeration is provided by the cooling tower and the circulating cooling water pump station. These two station houses are usually set up independently, which not only occupies a large amount of space and requires a large investment, but also lacks integrated energy-saving control and has high energy consumption. With the increasingly prominent energy problem and the improvement of environmental protection requirements, how to achieve efficient energy utilization and reduce carbon emissions has become an important research direction for industrial station houses. The application of an integrated station house with integrated control and energy management in the coking project can realize the automatic control of equipment, optimize the operating parameters of equipment, improve energy utilization efficiency, and reduce energy consumption and carbon emissions.

[0003] The solution of the prior art is as follows: In the coking project refrigeration station, cooling tower and circulating cooling water pump station, energy-saving operation is mainly achieved by reasonably allocating loads in the initial design, selecting high-efficiency equipment, and using variable-frequency motors. The existing technical problems are as follows: Although the existing technical solutions can achieve energy conservation and emission reduction to a certain extent, there are still some problems and limitations. First of all, the refrigeration station, cooling tower and circulating cooling water pump station usually operate independently, and it is impossible to achieve coordinated control between the refrigerating machine, cooling tower and circulating cooling water pump, resulting in low energy utilization efficiency. Secondly, the existing control system is relatively traditional, mainly adjusting the speed of the variable-frequency motor through flow monitoring, and cannot optimize the operating parameters of the equipment according to changes in seasons, external environments and user demands, and cannot meet the actual requirements of the project. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual-cooling station integrated system, which overcomes the deficiencies of the prior art, meets the actual needs of some equipment in the chemical gas purification unit of the coking project that requires low-temperature water in summer and circulating cooling water in non-summer seasons, realizes the integrated and intelligent control of the refrigeration system, provides low-temperature water in summer and circulating cooling water in non-summer seasons, and achieves the purpose of cost reduction, efficiency increase, energy conservation and emission reduction.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] A dual-cooling station integrated system includes a No. 1 chiller, a No. 2 chiller, a No. 1 cooling tower and a No. 2 cooling tower. The No. 1 chiller and the No. 2 chiller, as well as the No. 1 cooling tower and the No. 2 cooling tower, all adopt a redundant layout structure of one in use and one in standby. The No. 1 chiller or the No. 2 chiller, and the No. 1 cooling tower or the No. 2 cooling tower are respectively connected to an integrated control system and end-users to form a linkage control structure. The user return pipeline is connected to the liquid inlet of the chiller through the chiller return pipeline. The liquid outlet of the chiller is connected to the user supply pipeline through the chiller liquid outlet pipeline. The circulation port of the chiller is connected to the cooling tower through the cooling tower liquid inlet pipeline. The outlet of the cooling tower is respectively connected to the chiller liquid return port through the chiller liquid return pipeline and to the user return pipeline through the direct discharge pipeline. A cooling water pump is provided on the chiller liquid return pipeline, and a low-temperature water pump is provided on the user return pipeline. A switching pipeline is provided between the user return pipeline and the user supply pipeline, and a first switching valve is provided on the switching pipeline. A second switching valve is provided on the chiller return pipeline, a third switching valve is provided on the direct discharge pipeline, a fourth switching valve is provided on the chiller return pipeline, a fifth switching valve is provided on the user return pipeline, a sixth switching valve is provided on the chiller liquid return pipeline, and a seventh switching valve is provided on the cooling water supply pipeline. In summer, the chiller is in series with the cooling tower, and in non-summer, the chiller is cut out and the cooling tower operates alone.

[0007] Further, the specification of the chiller is a steam-type lithium bromide chiller.

[0008] Further, the cooling tower is a closed cooling tower or an open cooling tower.

[0009] Further, the chiller liquid return port is connected to a first electric control valve, and the liquid inlet of the chiller is connected to a fourth electric control valve.

[0010] Further, a second electric control valve is provided at the outlet of the cooling tower, and a third electric control valve is provided at the inlet of the cooling tower.

[0011] Further, a differential pressure sensor is provided between the inlet and outlet interfaces of the end-user.

[0012] Further, the integrated control system includes a low-temperature water controller and a cooling water controller, both of which are PLC controllers. The input module of the low-temperature water controller is respectively connected to a low-temperature water temperature sensor, a low-temperature water flow sensor and a differential pressure sensor. The output module of the low-temperature water controller respectively adjusts the fourth electric control valve, the low-temperature water pump and the chiller. The input module of the cooling water controller is respectively connected to each cooling water temperature sensor and the differential pressure sensor. The output module of the cooling water controller respectively adjusts the first electric control valve, the second electric control valve, the third electric control valve and the low-temperature water pump. The differential pressure sensor and the low-temperature water pump are for dual-channel control jointly managed by the low-temperature water controller and the cooling water controller.

[0013] Further, the motor speed of the low-temperature water pump is adjusted according to the feedback signals of the sensors of the low-temperature water controller in summer and the feedback signals of the sensors of the cooling water controller in non-summer, optimizing the operating parameters of the low-temperature water pump according to seasonal, environmental, and user demand changes to meet the requirements of the production process.

[0014] Further, the integrated control system statistically analyzes the energy consumption of the refrigerating machine and the cooling tower, ensures the system operates in the best state, digitally interconnects and coordinately controls the refrigerating machine and the cooling tower, and realizes the energy-saving and optimization control of the refrigeration system.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1) Integrated design. In the solution, the refrigeration station and the cooling tower are integrally arranged, realizing the coordinated control between equipment, which is beneficial to optimizing the operating parameters of the equipment and also beneficial to the maintenance and management of the equipment.

[0017] 2) Intelligent control. The technical solution adopts an integrated control system to realize the real-time observation and control of the operating state of the equipment, improving the operation and production efficiency of the station building.

[0018] 3) Energy saving and carbon reduction. Through integration and intelligent control, the present technical solution realizes the efficient utilization of energy and the reduction of carbon emissions, achieving the effect of energy saving and carbon reduction and improving the energy utilization rate.

[0019] 4) Easy to promote and apply. In the technical solution of the present invention, the integrated arrangement of the refrigeration station and the cooling tower not only saves space, reduces the length of the connecting pipelines, but also reduces the civil engineering and material investment, lowers the cost, shortens the construction period, reduces the control investment, and has a remarkable operation income effect, which is beneficial to promotion and application. Description of the Drawings

[0020] Figure 1 is a schematic process flow diagram of an embodiment of the present invention;

[0021] Figure 2 is a structural diagram of the control system of the present invention;

[0022] In the figure: 1-1# refrigerator, 2-1# cooling tower, 3- cooling water pump, 4- low-temperature water pump, 5- end user, 6- fourth electric control valve, 7- first electric control valve, 8- third electric control valve, 9- second electric control valve, 10-16- switching valve, 17- user supply water temperature sensor, 18- user return water temperature sensor, 19- low-temperature water flow sensor, 20- differential pressure sensor, 21- cooling water return temperature sensor, 22- cooling water circulation flow sensor, 23- cooling water return flow sensor, 24- cooling water direct discharge temperature sensor, 25- outdoor temperature sensor, 26- low-temperature water controller, 27- cooling water controller, 28- integrated control system, 29- user return pipeline, 30- 1# refrigerator return pipeline, 31- 1# refrigerator liquid outlet pipeline, 32- user supply pipeline, 33- 1# refrigerator liquid return pipeline, 34- 1# cooling tower liquid inlet pipeline, 35- direct discharge pipeline, 36- cooling water supply pipeline, 37- switching pipeline. Detailed implementation mode

[0023] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments.

[0024] In order to more clearly illustrate the specific implementation mode of the present invention or the technical solutions in the prior art, the specific embodiments required for the description of the specific implementation mode or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation modes of the present invention. For those of ordinary skill in the art, without creative efforts, other specific embodiments can also be obtained based on these specific embodiments.

[0025] Generally, the components of the embodiments of the present invention described and shown in the specific embodiments here can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only represents the selected embodiments of the present invention.

[0026] Such as Figure 1 And Figure 2As shown in the figure, it is a schematic structural diagram of an embodiment of a dual-cooling-station integrated system of the present invention, including a 1# chiller 1, a 2# chiller 1', a 1# cooling tower 2 and a 2# cooling tower 2'. The 1# chiller 1 and the 2# chiller 1', the 1# cooling tower 2 and the 2# cooling tower 2' all adopt a redundant layout structure of one in operation and one in standby. The 1# chiller 1 or the 2# chiller 1', the 1# cooling tower 2 and the 2# cooling tower 2' are respectively connected to the integrated control system 28 and the end user 5 to form a linkage control structure. The integrated control system statistically analyzes the energy consumption of the chiller and the cooling tower, ensures that the system operates in the best operating state, digitally interconnects and coordinately controls the chiller and the cooling tower, and realizes the energy-saving optimization control of the refrigeration system.

[0027] In summer, taking the operation of the 1# chiller 1 and the 1# cooling tower 2 as an example, the user return pipe 29 is connected to the liquid inlet of the 1# chiller 1 through the 1# chiller return pipe 30. The liquid outlet of the 1# chiller 1 is connected to the user supply pipe 32 through the 1# chiller liquid outlet pipe 31. The circulation port of the 1# chiller 1 is connected to the 1# cooling tower 2 through the 1# cooling tower liquid inlet pipe 34. The outlet of the 1# cooling tower 2 is respectively connected to the 1# chiller return port through the 1# chiller return liquid pipe 33 and to the user return pipe 29 through the direct discharge pipe 35. A cooling water pump 3 is provided on the 1# chiller return liquid pipe 33, and a low-temperature water pump 4 is provided on the user return pipe 29. A switching pipe 37 is provided between the user return pipe 29 and the user supply pipe 32. A first switching valve 13 is provided on the switching pipe 37. A second switching valve 10 is provided on the 1# chiller return pipe 30. A third switching valve 15 is provided on the direct discharge pipe 35. A fourth switching valve 12 is provided on the 1# chiller liquid outlet pipe 31. A fifth switching valve 14 is provided on the user return pipe 29. A sixth switching valve 11 is provided on the chiller return liquid pipe 33. A cooling water supply pipe 36 is also connected between the user return pipe 29 and the 1# cooling tower. A seventh switching valve 16 is provided on the cooling water supply pipe 36. The connection points of the direct discharge pipe 35 and the cooling water supply pipe 36 with the user return pipe 29 are respectively located on both sides of the fifth switching valve 14. In summer, the 1# chiller 1 and the 1# cooling tower 2 are connected in series. In non-summer, the 1# chiller 1 is cut out and the 1# cooling tower 2 operates alone.

[0028] In the embodiment, the specifications of the 1# chiller 1 and the 2# chiller 1' are steam-type lithium bromide chillers. The cooling tower can be either a closed cooling tower or an open cooling tower.

[0029] A first electric control valve 7 is provided at the liquid return port of the 1# refrigerating machine. A fourth electric control valve 6 is connected to the liquid inlet of the 1# refrigerating machine. A third electric control valve 8 is connected to the inlet of the 1# cooling tower. A second electric control valve 9 is provided at the outlet of the 1# cooling tower. A differential pressure sensor 20 is provided between the inlet and outlet interfaces of the end user 5. A user water supply temperature sensor 17 and a low-temperature water flow sensor 19 are provided on the liquid outlet pipeline 31 of the 1# refrigerating machine. A cooling water return temperature sensor 21 and a cooling water circulation flow sensor 22 are provided on the liquid inlet pipeline 34 of the 1# cooling tower. A cooling water return flow sensor 23 and a cooling water direct discharge temperature sensor 24 are provided on the direct discharge pipeline 35. A user return water temperature sensor 18 is provided on the return pipeline 30 of the 1# refrigerating machine. An outdoor temperature sensor 25 is arranged in the outdoor environment.

[0030] The integrated control system 28 includes a low-temperature water controller 26 and a cooling water controller 27, both of which are PLC controllers. The input modules of the low-temperature water controller 26 are respectively connected to the user water supply temperature sensor 17, the user return water temperature sensor 18, the low-temperature water flow sensor 19, and the differential pressure sensor 20. The output modules of the low-temperature water controller 26 respectively adjust the fourth electric control valve 6, the low-temperature water pump 4, and the 1# refrigerating machine 1. The input modules of the cooling water controller 27 are respectively connected to the cooling water return temperature sensor 21, the cooling water circulation flow sensor 22, the cooling water return flow sensor 23, the cooling water direct discharge temperature sensor 24, the outdoor temperature sensor 25, and the differential pressure sensor 20. The output modules of the cooling water controller 27 respectively adjust the first electric control valve 7, the third electric control valve 8, the second electric control valve 9, and the low-temperature water pump 4 on the inlet and outlet pipelines of the 1# cooling tower 2. That is, the differential pressure sensor 20 and the low-temperature water pump 4 are under the dual control of the low-temperature water controller 26 and the cooling water controller 27. The low-temperature water controller 26 adjusts the opening of the fourth electric control valve 6 at the liquid inlet of the 1# refrigerating machine, the motor speed of the low-temperature water pump 4, and the working load of the 1# refrigerating machine 1 according to the feedback signal of the integrated control system.

[0031] The low-temperature water control system 26 only operates in summer. The low-temperature water supply and return water temperatures are controlled at 16 / 23 °C, meeting the requirements of the low-temperature water required for the operation of some equipment in the chemical gas purification unit of the coking project in summer. The opening of the fourth electric control valve 6 at the low-temperature water inlet of the refrigerating machine and the load of the refrigerating machine 1 are adjusted according to the feedback signal of the low-temperature water control system 26.

[0032] In non-summer seasons, the cooling water controller 27 regulates the number of operating cooling towers, the opening degree of the first electric control valve 7, the third electric control valve 8, the opening degree of the second electric control valve 9, the fan of the 1# cooling tower 2, and the motor speed of the cooling water pump 3 according to the feedback signals of each sensor. The cooling water pump 3 is set one-to-one with the 1# refrigerating machine 1. The fan of the cooling tower 2 is a variable-frequency fan, and the cooling water pump 3 uses a variable-frequency motor. The cooling water controller 27 adjusts according to the feedback signals of each sensor. When the meteorological conditions permit, the cooling water temperature is reduced to improve the efficiency of the refrigeration system.

[0033] The integrated control system comprehensively coordinates and controls each device in the system. On the premise of ensuring the overall cooling capacity demand of the system, it enables the 1# refrigerating machine 1, the 1# cooling tower 2, the cooling water pump 3, and the low-temperature water pump 4 to operate in their optimal efficiency regions, thereby greatly improving the overall operating efficiency of the integrated refrigeration station.

[0034] During production, in summer, low-temperature water needs to be provided for the chemical gas purification unit equipment. The switching valves 13, 15, and 16 are closed, and the switching valves 10, 11, 12, and 14 are opened; in non-summer seasons, low-temperature water is not required, and the cooling water temperature of 32 °C can meet the demand. The switching valves 13, 15, and 16 are opened, and the switching valves 10, 11, 12, and 14 are closed.

[0035] The motor speed of the low-temperature water pump 4 is adjusted according to the feedback signals of each sensor of the low-temperature water controller 26 in summer and according to the feedback signals of each sensor of the cooling water controller 27 in non-summer seasons. The integrated control system statistically analyzes the energy consumption of the refrigerating machine and the cooling tower to ensure that the system operates in the best operating state, and digitally interconnects and coordinately controls the refrigerating machine and the cooling tower to achieve energy-saving and optimized control of the refrigeration system.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-cooling station integrated system, characterized in that, It includes Refrigerator 1, Refrigerator 2, Cooling Tower 1 and Cooling Tower 2. Refrigerator 1 and Refrigerator 2, Cooling Tower 1 and Cooling Tower 2 all adopt a redundant layout structure of one in operation and one in standby. Refrigerator 1 or Refrigerator 2, Cooling Tower 1 or Cooling Tower 2 are respectively connected to the integrated control system and the end user to form a linkage control structure; the user return pipeline is connected to the liquid inlet of the refrigerator through the refrigerator return pipeline, the liquid outlet of the refrigerator is connected to the user supply pipeline through the refrigerator liquid outlet pipeline, the circulation port of the refrigerator is connected to the cooling tower through the cooling tower inlet pipeline, and the outlet of the cooling tower is respectively connected to the refrigerator liquid return port through the refrigerator liquid return pipeline and to the user return pipeline through the direct discharge pipeline; a cooling water pump is provided on the refrigerator liquid return pipeline, and a low-temperature water pump is provided on the user return pipeline; a switching pipeline is provided between the user return pipeline and the user supply pipeline, a first switching valve is provided on the switching pipeline, a second switching valve is provided on the refrigerator return pipeline, a third switching valve is provided on the direct discharge pipeline, a fourth switching valve is provided on the refrigerator return pipeline, a fifth switching valve is provided on the user return pipeline, a sixth switching valve is provided on the refrigerator liquid return pipeline, and a seventh switching valve is provided on the cooling water supply pipeline; in summer, the refrigerator and the cooling tower are connected in series, and in non-summer, the refrigerator is cut out and the cooling tower operates alone.

2. The integrated system of dual cold stations according to claim 1, characterized in that, The specification of the refrigerator is a steam-type lithium bromide refrigerator.

3. The integrated system of dual cold stations according to claim 1, characterized in that, The cooling tower is a closed cooling tower or an open cooling tower.

4. The integrated system of a dual cold station according to claim 1, characterized in that, The refrigerator liquid return port is connected to a first electric control valve, and the liquid inlet of the refrigerator is connected to a fourth electric control valve.

5. A dual-cooling station integrated system according to claim 4, characterized in that, A second electric control valve is provided at the outlet of the cooling tower, and a third electric control valve is provided at the inlet of the cooling tower.

6. The integrated system of dual cold stations according to claim 5, characterized in that, A differential pressure sensor is provided between the inlet and outlet interfaces of the end user.

7. A dual-cooling station integrated system according to claim 6, wherein The integrated control system includes a low-temperature water controller and a cooling water controller, both of which are PLC controllers. The input module of the low-temperature water controller is respectively connected to a low-temperature water temperature sensor, a low-temperature water flow sensor and a differential pressure sensor, and the output module of the low-temperature water controller respectively adjusts the fourth electric control valve, the low-temperature water pump and the refrigerator; the input module of the cooling water controller is respectively connected to each cooling water temperature sensor and the differential pressure sensor, and the output module of the cooling water controller respectively adjusts the first electric control valve, the second electric control valve, the third electric control valve and the low-temperature water pump. The differential pressure sensor and the low-temperature water pump are for dual-channel control jointly managed by the low-temperature water controller and the cooling water controller.

8. A dual-cooling station integrated system according to claim 7, characterized in that, The motor speed of the low-temperature water pump is adjusted according to the feedback signals of each sensor of the low-temperature water controller in summer and according to the feedback signals of each sensor of the cooling water controller in non-summer. The operating parameters of the low-temperature water pump are optimized according to the changes in season, environment and user requirements to meet the requirements of the production process.

9. A dual-cooling-station integrated system according to claim 8, wherein, The integrated control system conducts statistical analysis on the energy consumption of the refrigerator and the cooling tower to ensure that the system operates in the best operating state, digitally interconnects and coordinately controls the refrigerator and the cooling tower, and realizes the energy-saving optimization control of the refrigeration system.

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