CN114322384B - High-coupling LNG cold energy ice making process and device - Google Patents
High-coupling LNG cold energy ice making process and device Download PDFInfo
- Publication number
- CN114322384B CN114322384B CN202111679875.5A CN202111679875A CN114322384B CN 114322384 B CN114322384 B CN 114322384B CN 202111679875 A CN202111679875 A CN 202111679875A CN 114322384 B CN114322384 B CN 114322384B
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- ice
- lng
- cold energy
- ice making
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a high-coupling LNG cold energy ice making process and a high-coupling LNG cold energy ice making device. The LNG gasification system adopts a gasification mode of secondary heat exchange of a refrigerant and auxiliary temperature rise of an air temperature type gasifier; the cold energy recycling system is used for making ice and a cold storage by using LNG cold energy; the electric compression refrigeration system is actually combined with the LNG cold energy ice making system, and the function of seamless switching of working conditions is achieved. Aiming at the condition that the utilization efficiency of an evaporator flow channel of the original ice maker is low, the structure of the evaporator pipeline is improved, all pipelines are connected in parallel to run, the ice making flow channel and the ice removing flow channel are coupled consistently, and the utilization rate of the pipeline is improved; the traditional ice making process is improved, the high-efficiency coupling and cold energy utilization under two working conditions of ice making and ice removing are ensured, and the cold energy utilization rate
The efficiency is improved, and the ice making time is greatly shortened.
Description
Technical Field
The invention belongs to the technical field of LNG cold energy recycling, and particularly relates to a high-coupling LNG cold energy ice making process and device.
Background
The existing published literature indicates that most of the existing LNG cold energy utilization technologies only focus on the design and optimization of the process, the problems of fluctuation of LNG gasification amount and energy efficiency of a station are not considered, and the adaptability of the system to the change of working conditions is poor. The gas consumption law of the existing LNG station is integrated for analysis, the gas consumption of the station changes along with the change of seasons and time periods, and higher requirements are put forward on the design, operation flexibility and the like of the LNG cold energy utilization process. The LNG cold energy utilization technology has different application ranges aiming at different working condition backgrounds, and is considered by combining various factors such as construction conditions of LNG stations, requirements of peripheral markets, equipment safety, cost benefits, policies and the like, wherein the LNG cold energy is used for the ice making technology, so that the LNG cold energy utilization technology is low in investment, high in benefit, high in cold energy utilization efficiency and good in adaptability to the conditions of complex working condition backgrounds and obvious seasonality. A cold energy ice-making method and device (CN 211345956U), but only LNG cold energy is used for making ice, and the ice-removing treatment is not involved, and the system efficiency is not high; an LNG cold energy recovery ice-making system (CN 211120163U) only solves the fluctuation problem of LNG gasification quantity, does not relate to an actual ice-making process, and has low adaptability to complex working conditions. Aiming at the conditions, the process has high working condition adaptability, large operational elasticity, long-time operation and considerable economic benefit.
Disclosure of Invention
The invention discloses a high-coupling LNG cold energy ice making process and a high-coupling LNG cold energy ice making device, and aims to design a set of LNG cold energy ice making design scheme which is high in operation elasticity, strong in self-adaptability, high in cold energy utilization rate and matched with LNG gasification amount of a station. The invention optimizes the evaporator structure of the ice maker, utilizes the two three-way valves to couple the cold energy ice making channel and the ice removing channel consistently, and achieves the purpose of rapid ice making and ice removing; the ice making process is improved, and by integrating a set of voltage compression refrigerating device, under the condition of supplying cold quantity, a high-temperature refrigerant is additionally provided for deicing, so that high coupling under two working conditions of ice making and deicing is realized. The system working condition is seamlessly switched, the problems of low ice making quantity, low operation elasticity and unstable working condition in the traditional ice making process are solved, and the improvement of the cold energy utilization rate and the improvement of the system
Efficiency, and greatly shortens the ice making time.
The invention is realized by at least one of the following technical schemes.
A high-coupling LNG cold energy ice making device comprises an LNG gasification system, a cold energy recycling system and a voltage compression refrigeration system;
the LNG gasification system comprises an LNG storage tank, an air-temperature type gasifier, a first heat exchanger and a third heat exchanger; the input end of the first heat exchanger is communicated with the output end of the LNG storage tank, the input end of the air-temperature type gasifier is connected with the input end of the third heat exchanger in parallel, and the input end of the air-temperature type gasifier is communicated with the output end of the first heat exchanger after being connected in parallel;
the cold energy recycling system is used for transmitting cold energy to a receiving end, the receiving end is a refrigerating unit, and the cold energy recycling system comprises a second heat exchanger, a liquid refrigerant storage tank, a refrigerant pump, an ice maker and a refrigerator water pool; one end of the ice maker is connected with two branches which are respectively communicated with the output end of the refrigerant pump and the input end of the deicing expansion valve, and the other end of the ice maker is also connected with two branches which are respectively communicated with the output end of the compressor and the input end of the second heat exchanger; the second heat exchanger is connected with the first heat exchanger in parallel and then is sequentially connected with the liquid refrigerant storage tank and the refrigerant pump; the cold storage is connected with the water pool in series and then connected with the ice maker in parallel;
the electric compression refrigeration system comprises a gas-liquid separation tank, a compressor, a refrigeration expansion valve and an ice-removing expansion valve; the third heat exchanger, the refrigeration expansion valve, the gas-liquid separation tank and the compressor are sequentially connected; the output end of the compressor is connected with two branches, one branch is communicated with the ice maker, and the other branch is communicated with the third heat exchanger; and heat exchange is carried out between the output ends of the refrigeration expansion valve and the deicing expansion valve and the second heat exchanger.
Further, still include pressure regulator, flowmeter, the output of air temperature vaporizer and the output of third heat exchanger all with pressure regulator, flowmeter are connected.
Further, a first regulating valve is arranged between the LNG storage tank and the first heat exchanger and used for regulating the flow of LNG, and a second regulating valve and a third regulating valve are arranged between the air-temperature type vaporizer and the third heat exchanger and used for realizing seamless switching of working conditions. When the system is in an ice making working condition, the LNG adopts a gasification mode that the first heat exchanger and the second heat exchanger are sequentially reheated, when the system is switched to an ice removing working condition, the LNG adopts a gasification mode that the first heat exchanger and the air temperature type gasifier are sequentially reheated, and when the third heat exchanger breaks down, the air temperature type gasifier can play a role in safely avoiding danger.
Furthermore, a fifth regulating valve for controlling flow circulation, a fourth regulating valve for controlling the on-off of the branch and a sixth regulating valve are arranged between the first heat exchanger and the second heat exchanger. And the fourth regulating valve and the sixth regulating valve are respectively positioned on two branches flowing out of the ice maker. Two three-way valves for changing the flow direction and the flow channel of the refrigerant are arranged at the front end and the rear end of the ice machine and are mainly used for switching ice making and ice removing states of the ice machine.
Further, the heat exchange media in the first heat exchanger, the second heat exchanger and the ice maker are the same refrigerant R507.
Furthermore, two ends of the ice maker are respectively provided with a three-way valve for changing the flow direction and the flow channel of the refrigerant and realizing the high-efficiency coupling of the flow channel, wherein the three-way valve is an ice making working condition three-way valve and an ice removing working condition three-way valve.
Furthermore, the second heat exchanger has the functional characteristics of an evaporator, the third heat exchanger has the functional characteristics of a condenser, and the high-temperature refrigerant at the outlet of the compressor is used as a second-stage reheating heat source of the LNG.
Furthermore, the second heat exchanger is provided with a bypass pipeline, and the adjustment and the switching of the process can be carried out according to the actual working condition.
Furthermore, the electric compression refrigeration system is divided into two sets of process flows which are respectively used for completing seamless connection of ice making and ice removing operations; the voltage-condensing refrigeration system is not provided with an additional condenser and an additional evaporator, and the second heat exchanger and the third heat exchanger can respectively serve as the evaporator and the condenser under different working conditions, so that the energy utilization maximization is expected to be achieved.
Furthermore, a reservoir and a water tank are arranged in the ice making system, even under the ice removing working condition, cold energy can still be efficiently utilized, and the ice making efficiency is improved by precooling the water tank.
The process for realizing ice making of the LNG cold energy ice making device with high coupling performance comprises the following steps:
LNG from the LNG storage tank enters a first heat exchanger to exchange heat with a refrigerant, is further heated by a third heat exchanger after being gasified and heated, and finally enters a pipe network after being regulated by a flowmeter, wherein a first regulating valve regulates the flow rate of the flowing LNG and emergently cuts off the flowing LNG;
the low-temperature refrigerant from the liquid refrigerant storage tank is subjected to heat exchange with water through an ice maker and then divided into two paths, LNG refrigeration cycle and voltage compression refrigeration cycle are respectively carried out, and finally the two paths of refrigerants return to the liquid refrigerant storage tank after being subjected to heat exchange respectively;
the cold energy ice making system comprises two working conditions of ice making and ice removing; when the ice maker is in an ice making state, the pipelines on the upper parts of the ice making working condition three-way valve and the ice removing working condition three-way valve are simultaneously disconnected, a low-temperature refrigerant directly enters the ice maker for heat exchange, the low-temperature refrigerant enters the first heat exchanger and the second heat exchanger respectively after being heated, and a high-temperature refrigerant from the outlet of the compressor enters the third heat exchanger for reheating of LNG; when the ice maker is in an ice-removing state, the side pipelines of the two three-way valves are disconnected, high-temperature and high-pressure refrigerant from the compressor enters the ice maker to exchange heat and remove ice, then is converged into an ice-removing expansion valve to be partially gasified, then enters the gas-liquid separation tank, and finally returns to the compressor; at the moment, the ninth stop valve and the tenth stop valve are opened, and the refrigerant sequentially enters the refrigeration house and the water pool to achieve the purpose of gradient utilization of cold energy; and at the moment, the third regulating valve is closed, and the LNG is sent to the natural gas pipeline network after being heated by the air-temperature type gasifier in an auxiliary mode.
Furthermore, in an evaporator of the ice maker, all pipelines are connected in parallel, when the ice maker is in an ice making state, all pipelines are filled with low-temperature refrigerants for making ice, when the ice maker is in an ice removing state, all pipelines are filled with high-temperature refrigerants for removing ice, the circulating refrigerants and the voltage compression refrigerants select the same working medium, and the ice making working condition three-way valve and the ice removing working condition three-way valve are used as switching media of the two states of ice making and ice removing.
Compared with the prior art, the invention has the following beneficial effects:
1. the LNG gasification system adopts refrigerant R507 for secondary reheating, has high equipment and process coupling, and really realizes cascade utilization.
2. The refrigerant used in the voltage-condensation refrigeration cycle and the LNG cold energy utilization cycle refrigerant are the same working medium, the heat exchange matching degree is high, and the heat exchange effect is good.
3. The structure of the evaporator of the ice machine is optimized, the ice making flow channel is coupled with the ice removing flow channel consistently, the utilization rate of the evaporator pipeline is increased, and the ice making quantity is increased.
4. Under the working condition of ice shedding, cold energy is fully utilized, cold energy waste is reduced, cold energy is provided for a refrigeration house for storing ice, the cold energy is used for precooling water, and the ice making time is shortened.
And 5, the LNG cold energy ice making process ensures the maximization of energy utilization, and has the advantages of large operation elasticity, high self-adaptability and wide coverage range.
6. The heat generated in the compression refrigeration system is fully utilized to carry out ice melting operation, and a part of heat energy is used for reheating LNG, so that a reheater, a condenser and an LNG auxiliary heater in the traditional process are omitted, and the effects of efficient energy utilization and maximized equipment utilization are achieved.
Drawings
Fig. 1 is a schematic diagram of a process and an apparatus for making ice from LNG cold energy with high coupling performance according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an ice-making mode of an embodiment of the present invention;
FIG. 3 is a schematic illustration of an ice shedding mode of an embodiment of the present invention;
the figures show that: 1-LNG storage tank, 2-first regulating valve, 3-second regulating valve, 4-air temperature type vaporizer, 5-pressure regulator, 6-flowmeter, 7-first heat exchanger, 8-third regulating valve, 9-third heat exchanger, 10-first stop valve, 11-second heat exchanger, 12-fourth regulating valve, 13-fifth regulating valve, 14-second stop valve, 15-sixth regulating valve, 16-third stop valve, 17-liquid refrigerant storage tank, 18-refrigerant flow regulating valve, 19-refrigerant pump, 20-ice making condition three-way valve, 21-ice maker, 22-deicing condition three-way valve, 23-fourth stop valve, 24-fifth stop valve, 25-sixth stop valve, 26-seventh stop valve, 27-ice making regulating valve, 28-deicing regulating valve, 29-separation tank, 30-gas-liquid compressor, 31-seventh regulating valve, 32-refrigeration expansion valve, 33-eighth stop valve, 34-deicing expansion valve, 35-ninth water pool stop valve, 36-37-refrigeration pool, 38-tenth refrigeration storage room.
Detailed Description
For a better understanding of the present invention, reference is made to the following examples and accompanying drawings, but the scope of the invention as claimed is not limited to the scope of the examples.
Example 1
Taking a certain LNG station as an example, the gas consumption is low in 1-2 months, the gas consumption of LNG rapidly rises in 2-3 months, and the gas consumption is over 6 monthsThe later gas consumption is further increased, the whole process scale is designed by taking the gas consumption of the LNG station of 3-6 months as a reference, and the daily gas consumption is about 40000m 3 。
As shown in fig. 1, fig. 2 and fig. 3, the LNG cold energy ice making process and the LNG cold energy ice making device with high coupling provided in this embodiment include an LNG vaporization system, a cold energy recycling system and a voltage compression refrigeration system.
The LNG gasification system comprises an LNG storage tank 1, an air-temperature type gasifier 4, a first heat exchanger 7, a third heat exchanger 9, a pressure regulator 5 and a flowmeter 6, wherein a heat exchange medium in the first heat exchanger 7 is a refrigerant R507, the air-temperature type gasifier 4 and the third heat exchanger 9 are connected in parallel and are communicated with the output end of the LNG storage tank 1 together, the output end of the LNG storage tank is connected with the flowmeter 6 through the pressure regulator 5 and finally enters a pipe network after being regulated, a second regulating valve 3 and a third regulating valve 8 are arranged on two branches of the outlet of the first heat exchanger 7 to achieve the effect of working condition switching, and the input end of the pressure regulator 5 is communicated with a first cut-off valve 10 to achieve emergency cut-off of the working condition;
a fifth regulating valve 13 for regulating flow, a fourth regulating valve 12 for branch on-off and switching, and a sixth regulating valve 15 are arranged between the first heat exchanger 7 and the second heat exchanger 11, wherein the second stop valve 14 is used for emergency cut-off, and a third stop valve 16 is arranged on an output end pipeline of the second heat exchanger 11 and is also used for emergency cut-off of working conditions; a first regulating valve 2 is arranged between the first heat exchanger 7 and the LNG storage tank 1, so that the LNG gasification amount out-of-station can be properly regulated according to the usage amount of natural gas of downstream users. When the downstream gas consumption is large and exceeds the cold energy operation load, the air temperature type gasifier 4 is started to assist the gasification and the secondary heat exchange gasification of the refrigerant to be carried out simultaneously, so that the sufficient supply of the LNG is ensured. LNG coming out of the first heat exchanger 7 respectively enters two paths of gasification systems, one path is conveyed to a downstream user through a pipe network after being gasified by the aid of the air temperature type gasifier 4, and the other path is sent to the downstream user after being reheated to a specified temperature by the high-temperature refrigerant R507 in the third heat exchanger 9, wherein the refrigerant processed by the first heat exchanger 7 carries LNG cold energy which can be used by a cold energy recycling system, and when the LNG gasification amount is high, the recycled cold energy is correspondingly increased.
The cold energy recycling system is used for transferring cold energy to a receiving end, the receiving end is a refrigerating unit, and the refrigerating unit comprises a second heat exchanger 11, a liquid refrigerant storage tank 17, a refrigerant pump 19, an ice maker 21, a refrigeration house 36 and a water tank 37. The front end of the ice maker 21 is connected with two branches which are respectively communicated with the output end of the refrigerant pump 19 and the input end of the deicing expansion valve 34, and the tail end of the ice maker is also connected with two branches which are respectively communicated with the output end of the compressor 30 and the input end of the second heat exchanger 11; the second heat exchanger 11 and the first heat exchanger 7 are connected in parallel and are connected with a liquid refrigerant storage tank 17, a refrigerant flow regulating valve 18 and a refrigerant pump 19 in sequence; freezer 36 and pond 37 are established ties each other to common and ice machine 21 parallel connection, wherein the input of freezer 36 is provided with ninth stop valve 35, and the output in pond 37 is provided with tenth stop valve 38. When the system is in an ice making state: according to the condition that the gas consumption of downstream users is high, the circulation pipelines of the first heat exchanger 7 and the second heat exchanger 11 are opened simultaneously by combining the ice demand of the market, namely, the fourth adjusting valve 12, the fifth adjusting valve 13, the second stop valve 14, the sixth adjusting valve 15 and the third stop valve 16 are all opened, electric compression refrigeration and refrigerant heat exchange are carried out simultaneously, the refrigerant after heat exchange enters a liquid refrigerant storage tank 17 and is pumped into an ice maker 21 by a refrigerant pump 19, cold energy is finally transmitted to water, and an ice making flow channel and an ice removing flow channel of the ice maker 21 are coupled and consistent through switching of the two three-way valves, so that the evaporator pipeline does not need to carry out pipeline division on ice making and ice removing, the flow channel utilization rate is improved, and the ice making quantity is increased.
The electric compression refrigeration system comprises a gas-liquid separation tank 29, a compressor 30, a refrigeration expansion valve 32 and an ice-removing expansion valve 34. The third heat exchanger 9 is connected with a refrigeration expansion valve 32, a gas-liquid separation tank 29 and a compressor 30 in sequence; the output end of the compressor 30 is connected with two branches, one branch is communicated with the ice maker 21, the other branch is communicated with the third heat exchanger 9, and the input end of the third heat exchanger 9 is provided with a seventh regulating valve 31; the output ends of the refrigeration expansion valve 32 and the deicing expansion valve 34 exchange heat with the second heat exchanger 11, wherein an eighth stop valve 33 is arranged on the pipeline of the output end of the refrigeration expansion valve 32 for switching working conditions, an ice making regulating valve 27 is arranged on the input end of the second heat exchanger 11, and the deicing regulating valve 28 is connected in parallel with the ice making regulating valve 27 and is also used for switching working conditions. When the system is in an ice making state, the top valves of the two three-way valves are disconnected, the cold energy ice making flow channel is connected, a low-temperature refrigerant R507 flowing out of the liquid refrigerant storage tank 17 enters the ice making machine 21 to complete ice making operation, at the moment, a high-temperature refrigerant flowing out of the compressor 30 enters the third heat exchanger 9 to reheat LNG, and finally, the LNG and the refrigerant R507 exchange heat in the second heat exchanger 11 after being subjected to pressure reduction through the refrigeration expansion valve 32, at the moment, the ice removal adjusting valve 28 is closed, and the ice making adjusting valve 27 is opened; when the system is in an ice-shedding state, the eighth stop valve 33 is closed, the two three-way valves are connected with the voltage compression refrigeration channel, the high-temperature refrigerant from the compressor 30 enters the ice maker 21 to exchange heat with ice, so that ice blocks melt by about 5% and fall off, the ice-shedding operation is completed, the refrigerant from the ice maker 21 is communicated with the ice-shedding expansion valve 34 and enters a pipeline system, and the compression refrigeration operation in the whole ice-shedding mode is normally performed; when the system is in the deicing mode, the seventh regulating valve 31 is closed, the LNG is reheated by the air temperature type vaporizer 4, the ninth stop valve 35 and the tenth stop valve 38 are opened, and the refrigerant R507 flowing out of the liquid refrigerant storage tank 17 sequentially passes through the refrigeration storage 36 and the water tank 37 to be precooled.
The two ends of the ice maker 21 are respectively provided with three-way valves for changing the flow direction and the flow channel of the refrigerant and realizing the high-efficiency coupling of the flow channel, namely an ice making condition three-way valve 20 and an ice removing condition three-way valve 22.
The ice making condition three-way valve 20 and the deicing condition three-way valve 22 are respectively provided with two stop valves, namely a fourth stop valve 23, a fifth stop valve 24, a sixth stop valve 25 and a seventh stop valve 26 on the upper part and the side pipeline. On the one hand, the disassembly and the inspection of the three-way valve are convenient, on the other hand, when the three-way valve is damaged, the stop valve can be closed in time, the flow direction of a refrigerant is changed, and therefore safety accidents are avoided.
The LNG cold energy ice making process and the device with high coupling performance comprise the following steps:
LNG coming out of an LNG storage tank 1 enters a first heat exchanger 7 under the condition of 40bar to 160 ℃ or so, the LNG exchanges heat with a refrigerant R507 with the temperature of-10 ℃ and 3bar to heat to-40 ℃, then enters a third heat exchanger 9 to exchange heat with a refrigerant R507 with the temperature of 76 ℃ coming out of a compressor 30, the LNG is sent into a pipe network through a flow meter 6 after being heated to the temperature above 0 ℃, and a first regulating valve 2 regulates the flow of the flowing LNG; (the limitation of temperature in this embodiment is only a specific example and does not constitute a limitation of the scope of protection)
The refrigerant R507 in the first heat exchanger 7 is subjected to heat exchange and temperature reduction, and enters the LNG cold energy ice making system after being condensed to-25 ℃, the refrigerant R507 in the second heat exchanger 11 exchanges heat with a low-temperature refrigerant at-35 ℃ at the outlet of the refrigeration expansion valve 32, and also enters the LNG cold energy ice making system after being cooled to-25 ℃, the refrigerant R507 at-25 ℃ exchanges heat with water in the ice making machine 21, and returns to the first heat exchanger 7 and the second heat exchanger 11 after being heated to-10 ℃;
in the electrical compression refrigeration system, high-temperature refrigerant from a compressor 30 enters a third heat exchanger 9 to exchange heat with LNG for cooling, is condensed to 30 ℃ and then is sent to a refrigeration expansion valve 32 to be partially gasified, and finally enters a second heat exchanger 11 to exchange heat with refrigerant R507 for evaporation, and returns to the compressor 30 after passing through a gas-liquid separation tank 29 to complete circulation;
after ice making is finished, the cold energy ice making channel is closed, the three-way valve is connected with the voltage compression refrigeration channel, the ninth stop valve 35 and the tenth stop valve 38 are opened, a refrigerant R507 sequentially enters the refrigeration house 36 and the water tank 37, the temperature is finally raised to-5 ℃, the refrigerant is finally subjected to heat exchange and condensation through the first heat exchanger 7 and the second heat exchanger 11 to-23 ℃, the refrigerant finally enters the liquid refrigerant storage tank 17 to complete circulation, the eighth stop valve 33 is closed, a high-temperature refrigerant from the compressor 30 enters the ice making machine 21 to exchange heat with ice and is cooled to 30 ℃, then flows into the deicing expansion valve 34 to be partially gasified, the temperature is lowered to-35 ℃, the refrigerant is finally subjected to heat exchange and temperature rise through the second heat exchanger 11 to-31 ℃, enters the gas-liquid separation tank 29, and finally returns to the compressor 30 to complete circulation, and when the block ice melts by about 5%, the deicing operation is finished;
in this embodiment, the LNG with a mass flow rate of 1t/h, the cooling capacity of the ice maker 21 in the ice making mode is 198KW, and the whole process flow is
The efficiency is 56.9 percent, and the cold energy utilization rate is 93.4 percent; ice shedding modeThe cooling capacity to be supplied to the refrigerator 36 is 187KW, and the cooling capacity to be supplied to the water supply tank 37 is 12KW.
Example 2
As shown in fig. 1, the LNG cold energy ice making process and apparatus with high coupling provided in this embodiment include an LNG vaporization system, a cold energy recycling system, and a voltage-compression refrigeration system.
The LNG gasification system comprises an LNG storage tank 1, an air-temperature type gasifier 4, a first heat exchanger 7, a third heat exchanger 9, a pressure regulator 5 and a flow meter 6, wherein the air-temperature type gasifier 4 and the third heat exchanger 9 are connected in parallel and are communicated with the output end of the LNG storage tank 1 together, the output end of the air-temperature type gasifier is connected with the flow meter 6 through the pressure regulator 5, and finally the air-temperature type gasifier enters a pipe network after being regulated, wherein a second regulating valve 3 and a third regulating valve 8 are used for switching working conditions, and a first stop valve 10 is used for emergency cut-off of the working conditions; a fifth regulating valve 13 for regulating flow, a fourth regulating valve 12 for branch on-off and switching, and a sixth regulating valve 15 are arranged between the first heat exchanger 7 and the second heat exchanger 11, wherein the second stop valve 14 is used for emergency cut-off, and a third stop valve 16 is arranged on an output end pipeline of the second heat exchanger 11 and is also used for emergency cut-off of working conditions; a first regulating valve 2 is arranged between the first heat exchanger 7 and the LNG storage tank 1, so that the LNG gasification amount out-of-station can be properly regulated according to the usage amount of natural gas of downstream users.
When the downstream gas consumption is low and the external gas output is stable, only the secondary heat exchange channel of the refrigerant is opened to assist the gasification.
The cold energy recycling system is used for transferring cold energy to a receiving end, and the receiving end is a refrigerating unit and comprises a liquid refrigerant storage tank 17, a refrigerant pump 19, an ice maker 21, a refrigeration house 36 and a water tank 37. The front end of the ice maker 21 is connected with two branches which are respectively communicated with the output end of the refrigerant pump 19 and the input end of the deicing expansion valve 34, and the tail end of the ice maker is also connected with two branches which are respectively communicated with the output end of the compressor 30 and the input end of the first heat exchanger 7; the first heat exchanger 7 is sequentially connected with a liquid refrigerant storage tank 17, a refrigerant flow regulating valve 18 and a refrigerant pump 19; the cold storage 36 and the water tank 37 are connected in series with each other and are connected in parallel with the ice maker 21 in common. The second heat exchanger 11 is provided with a bypass line on which the de-icing regulating valve 28 is located, and the bypass line can be opened if the second heat exchanger 11 fails. The system operates in the same manner as in the first embodiment.
The electric compression refrigeration system comprises a gas-liquid separation tank 29, a compressor 30, a refrigeration expansion valve 32 and an ice-removing expansion valve 34. The third heat exchanger 9 is connected with a refrigeration expansion valve 32, a gas-liquid separation tank 29 and a compressor 30 in sequence; the output end of the compressor 30 is connected with two branches, wherein one branch is communicated with the ice maker 21, and the other branch is communicated with the third heat exchanger 9; the output ends of the refrigeration expansion valve 32 and the deicing expansion valve 34 exchange heat with the second heat exchanger 11. When the system is in the ice making state and the ice removing state, the operation of the electric compression refrigeration system is the same as that of the first embodiment.
Example 3
As shown in fig. 1, the LNG cold energy ice making process and apparatus with high coupling provided in this embodiment include an LNG vaporization system, a cold energy recycling system, and an electric compression refrigeration system.
The LNG gasification system comprises an LNG storage tank 1, an air-temperature type gasifier 4, a first heat exchanger 7, a third heat exchanger 9, a pressure regulator 5 and a flow meter 6, wherein a heat exchange medium in the first heat exchanger 7 is a refrigerant R507, the air-temperature type gasifier 4 and the third heat exchanger 9 are connected in parallel and are communicated with the output end of the LNG storage tank 1 together, the output end of the air-temperature type gasifier is connected with the flow meter 6 through the pressure regulator 5 and finally enters a pipe network after being regulated, wherein the second regulating valve 3 and the third regulating valve 8 are used for switching working conditions, and the first stop valve 10 is used for emergency cut-off of the working conditions; a fifth regulating valve 13 for regulating flow, a fourth regulating valve 12 for branch on-off and switching, and a sixth regulating valve 15 are arranged between the first heat exchanger 7 and the second heat exchanger 11, wherein the second stop valve 14 is used for emergency cut-off, and a third stop valve 16 is arranged on an output end pipeline of the second heat exchanger 11 and is also used for emergency cut-off of working conditions; a first adjusting valve 2 is arranged between the first heat exchanger 7 and the LNG storage tank 1, so that the gasification amount of the LNG transported out of the station can be properly adjusted according to the usage amount of natural gas of downstream users. The LNG vaporization mode is the same as the first embodiment, and the LNG flow rate is determined by the opening degree of the first control valve 2.
The cold energy recycling system is used for transferring cold energy to a receiving end, and the receiving end is a refrigerating unit and comprises a second heat exchanger 11, a liquid refrigerant storage tank 17, a refrigerant pump 19, an ice maker 21, a refrigeration house 36 and a water tank 37. The front end of the ice maker 21 is connected with two branches which are respectively communicated with the output end of the refrigerant pump 19 and the input end of the deicing expansion valve 34, and the tail end of the ice maker is also connected with two branches which are respectively communicated with the output end of the compressor 30 and the input end of the second heat exchanger 11; the second heat exchanger 11 and the first heat exchanger 7 are connected in parallel and are sequentially connected with a liquid refrigerant storage tank 17 and a refrigerant pump 19; freezer 36 and pond 37 are established ties each other to common and ice machine 21 parallel connection, wherein the input of freezer 36 is provided with ninth stop valve 35, and the output in pond 37 is provided with tenth stop valve 38. The ice making method is the same as the first embodiment, and is suitable for the condition of high ice making amount in daytime. The difference is that as the LNG output increases, the system recovery cold quantity increases, at the moment, the flow quantity of the refrigerant R507 coming out of the liquid refrigerant storage tank 17 increases, when the ice making quantity exceeds the market ice demand, the ninth stop valve 35 and the tenth stop valve 38 are synchronously opened at the moment, part of the cold quantity used for making ice is transmitted to the refrigeration house 36 and the water pool 37, the refrigeration house 36 is used for storing block ice, and the ice making time can be greatly shortened, the ice making efficiency can be improved by 20-30% by reducing the water to 0-10 ℃, and the operation flexibility of the process is increased.
The electric compression refrigeration system comprises a gas-liquid separation tank 29, a compressor 30, a refrigeration expansion valve 32 and an ice-removing expansion valve 34. The third heat exchanger 9 is connected with a refrigeration expansion valve 32, a gas-liquid separation tank 29 and a compressor 30 in sequence; the output end of the compressor 30 is connected with two branches, wherein one branch is communicated with the ice maker 21, and the other branch is communicated with the third heat exchanger 9; the output ends of the refrigeration expansion valve 32 and the deicing expansion valve 34 exchange heat with the second heat exchanger 11. Wherein the electric compression refrigeration system operates in the same manner as in the first embodiment. The invention can deal with the fluctuation problem of the gasification quantity of the LNG satellite station, has large operation flexibility, high ice making quantity and considerable economic benefit, and the LNG refrigeration and the voltage compression refrigeration are seamlessly switched, thereby greatly saving the starting time of the system. The utilization rate of cold energy of the whole system is 93.4 percent,
The efficiency was 56.9%.
The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides a LNG cold energy ice making device of high coupling nature which characterized in that: the system comprises an LNG gasification system, a cold energy recycling system and a voltage compression refrigeration system;
the LNG gasification system comprises an LNG storage tank (1), an air-temperature type gasifier (4), a first heat exchanger (7) and a third heat exchanger (9); the input end of the first heat exchanger (7) is communicated with the output end of the LNG storage tank (1), the input end of the air-temperature type gasifier (4) is connected with the input end of the third heat exchanger (9) in parallel, and the input end of the air-temperature type gasifier is communicated with the output end of the first heat exchanger (7) after being connected in parallel;
the cold energy recycling system is used for transferring cold energy to a receiving end, the receiving end is a refrigerating unit, and the cold energy recycling system comprises a second heat exchanger (11), a liquid refrigerant storage tank (17), a refrigerant pump (19), an ice maker (21) and a water tank (37) of a refrigeration house (36); one end of the ice maker (21) is connected with two branches which are respectively communicated with the output end of the refrigerant pump (19) and the input end of the deicing expansion valve (34), and the other end of the ice maker is also connected with two branches which are respectively communicated with the output end of the compressor (30) and the input end of the second heat exchanger (11); the second heat exchanger (11) is connected with the first heat exchanger (7) in parallel and then sequentially connected with the liquid refrigerant storage tank (17) and the refrigerant pump (19); the refrigeration house (36) is connected with the water pool (37) in series and then connected with the ice maker (21) in parallel; the second heat exchanger (11) has the functional characteristics of an evaporator, the third heat exchanger (9) has the functional characteristics of a condenser, and the high-temperature refrigerant at the outlet of the compressor (30) is used as a second-stage reheating heat source of the LNG;
the electric compression refrigeration system comprises a gas-liquid separation tank (29), a compressor (30), a refrigeration expansion valve (32) and an ice-removing expansion valve (34); the third heat exchanger (9), the refrigeration expansion valve (32), the gas-liquid separation tank (29) and the compressor (30) are sequentially connected; the output end of the compressor (30) is connected with two branches, one branch is communicated with the ice maker (21), and the other branch is communicated with the third heat exchanger (9); the output ends of the refrigeration expansion valve (32) and the deicing expansion valve (34) exchange heat with the second heat exchanger (11); and three-way valves for changing the flow direction and the flow channel of the refrigerant and realizing the high-efficiency coupling of the flow channel are respectively arranged at two ends of the ice maker (21), and are respectively an ice making working condition three-way valve (20) and an ice removing working condition three-way valve (22).
2. A high coupling LNG cold energy ice making apparatus as claimed in claim 1, wherein: still include voltage regulator (5), flowmeter (6), the output of air temperature formula vaporizer (4) and the output of third heat exchanger (9) all with voltage regulator (5), flowmeter (6) are connected.
3. A high coupling LNG cold energy ice making apparatus as claimed in claim 1, wherein: a first regulating valve (2) is arranged between the LNG storage tank (1) and the first heat exchanger (7) and used for regulating LNG flow, and a second regulating valve (3) and a third regulating valve (8) are arranged between the air-temperature type gasifier (4) and the third heat exchanger (9) and used for achieving seamless switching of working conditions.
4. A high coupling LNG cold energy ice making apparatus as claimed in claim 1, wherein: and a fifth regulating valve (13) for controlling flow circulation, a fourth regulating valve (12) for controlling the on-off of the branch and a sixth regulating valve (15) are arranged between the first heat exchanger (7) and the second heat exchanger (11).
5. A high coupling LNG cold energy ice making apparatus as claimed in claim 1, wherein: the heat exchange media in the first heat exchanger (7), the second heat exchanger (11) and the ice maker (21) are the same refrigerant R507.
6. An LNG cold energy ice making apparatus with high coupling as claimed in any one of claims 1 to 5, wherein: the second heat exchanger (11) is provided with a bypass pipeline.
7. An ice making process for implementing the high-coupling LNG cold energy ice making apparatus of claim 6, comprising the steps of:
LNG coming out of the LNG storage tank (1) enters a first heat exchanger (7) to exchange heat with a refrigerant, is gasified and heated, then is further heated by a third heat exchanger (9), and finally enters a pipe network after being regulated by a flowmeter (6) arranged at the output end of the third heat exchanger (9), wherein a first regulating valve (2) arranged between the LNG storage tank (1) and the first heat exchanger (7) regulates the flow of the flowing LNG and emergently cuts off the flowing LNG;
the low-temperature refrigerant from the liquid refrigerant storage tank (17) is subjected to heat exchange with water through an ice maker (21) and then divided into two paths, LNG refrigeration cycle and voltage compression refrigeration cycle are respectively carried out, and finally the two paths of refrigerants respectively exchange heat and then return to the liquid refrigerant storage tank (17);
the voltage compression refrigeration system comprises two working conditions of ice making and ice removing; when the ice maker (21) is in an ice making state, the pipelines on the upper parts of the ice making condition three-way valve (20) and the ice removing condition three-way valve (22) are simultaneously disconnected, a low-temperature refrigerant directly enters the ice maker (21) for heat exchange, and respectively enters the first heat exchanger (7) and the second heat exchanger (11) after being heated, and a high-temperature refrigerant from the outlet of the compressor (30) enters the third heat exchanger (9) for LNG reheating; when the ice maker (21) is in an ice-shedding state, the side pipelines of the two three-way valves are disconnected, high-temperature and high-pressure refrigerant discharged from the compressor (30) enters the ice maker (21) to exchange heat and shed ice, then is converged into the ice-shedding expansion valve (34) to be partially gasified, then enters the gas-liquid separation tank (29), and finally returns to the compressor (30); at the moment, the ninth stop valve (35) and the tenth stop valve (38) are opened, and the refrigerant sequentially enters the refrigeration house (36) and the water tank (37) to achieve the purpose of gradient utilization of cold energy; and at the moment, a third regulating valve (8) arranged between the air-temperature type gasifier (4) and the third heat exchanger (9) is closed, and the LNG is sent to the natural gas pipeline network after being heated by the aid of the air-temperature type gasifier (4).
8. An ice making process according to claim 7, wherein: in an evaporator of an ice maker (21), all pipelines are connected in parallel, when the ice making state is realized, low-temperature refrigerants are introduced into all the pipelines for making ice, when the ice removing state is realized, high-temperature refrigerants are circulated in all the pipelines for removing ice, the circulating refrigerants and the voltage compression refrigerants select the same working medium, and an ice making working condition three-way valve (20) and an ice removing working condition three-way valve (22) are used as switching media of the ice making state and the ice removing state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111679875.5A CN114322384B (en) | 2021-12-31 | 2021-12-31 | High-coupling LNG cold energy ice making process and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111679875.5A CN114322384B (en) | 2021-12-31 | 2021-12-31 | High-coupling LNG cold energy ice making process and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114322384A CN114322384A (en) | 2022-04-12 |
| CN114322384B true CN114322384B (en) | 2022-10-21 |
Family
ID=81022875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111679875.5A Active CN114322384B (en) | 2021-12-31 | 2021-12-31 | High-coupling LNG cold energy ice making process and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114322384B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11337238A (en) * | 1998-05-27 | 1999-12-10 | Hitachi Ltd | Ice thermal storage system |
| JP2007175699A (en) * | 2005-12-02 | 2007-07-12 | Chugoku Electric Manufacture Co Ltd | System for producing electrolytic seawater ice, apparatus for producing electrolytic seawater, ice-making apparatus, method for producing electrolytic seawater ice, and method for preserving fresh fish |
| JP2008089164A (en) * | 2006-10-05 | 2008-04-17 | Ishikawajima Plant Construction Co Ltd | Lng gasifying apparatus |
| CN211120163U (en) * | 2019-09-05 | 2020-07-28 | 浙江紫明科技有限公司 | L NG cold energy recovery ice making system |
| CN211345956U (en) * | 2019-10-16 | 2020-08-25 | 深圳市开迩文科技有限公司 | Liquefied natural gas cold energy ice making device |
| CN112629069A (en) * | 2020-12-10 | 2021-04-09 | 华南理工大学 | Multi-energy complementary LNG cold energy integrated utilization process and device |
-
2021
- 2021-12-31 CN CN202111679875.5A patent/CN114322384B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11337238A (en) * | 1998-05-27 | 1999-12-10 | Hitachi Ltd | Ice thermal storage system |
| JP2007175699A (en) * | 2005-12-02 | 2007-07-12 | Chugoku Electric Manufacture Co Ltd | System for producing electrolytic seawater ice, apparatus for producing electrolytic seawater, ice-making apparatus, method for producing electrolytic seawater ice, and method for preserving fresh fish |
| JP2008089164A (en) * | 2006-10-05 | 2008-04-17 | Ishikawajima Plant Construction Co Ltd | Lng gasifying apparatus |
| CN211120163U (en) * | 2019-09-05 | 2020-07-28 | 浙江紫明科技有限公司 | L NG cold energy recovery ice making system |
| CN211345956U (en) * | 2019-10-16 | 2020-08-25 | 深圳市开迩文科技有限公司 | Liquefied natural gas cold energy ice making device |
| CN112629069A (en) * | 2020-12-10 | 2021-04-09 | 华南理工大学 | Multi-energy complementary LNG cold energy integrated utilization process and device |
Non-Patent Citations (2)
| Title |
|---|
| 《LNG冷能制冰项目建设及问题探讨》;陈宏燕;《广东化工》;20151231;第42卷(第15期);全文 * |
| LNG冷能用于冷库和冷水的技术开发;杨春;《煤气与热力》;20121231;第32卷(第12期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114322384A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201093819Y (en) | LNG cold energy step level, integrated utilization system | |
| CN110671840B (en) | Heat, power and cold combined supply system based on liquefied natural gas gasification cold energy and operation method | |
| CN108507083B (en) | Ice-storage type heat source tower heat pump system device and method | |
| CN111565543A (en) | Water-cooling natural cooling refrigerant direct cooling refrigeration system | |
| CN211692583U (en) | Natural gas excess pressure distributed utilization system | |
| CN206695421U (en) | LNG cold energy refrigerating circulatory devices | |
| CN109668362A (en) | Utilize the more library temperature refrigeration storage systems and its working method of natural gas pipe network pressure energy | |
| CN106839486A (en) | LNG cold energy cooling cycle systems | |
| CN207963223U (en) | A kind of heat pump air conditioning system | |
| CN107764122B (en) | Large-temperature-difference cold water combined type cascade utilization system based on waste heat utilization | |
| CN210624986U (en) | Comprehensive cold and heat source supply optimization energy-saving system | |
| CN113923937A (en) | Energy-saving cooling control method and system for data center | |
| CN114322384B (en) | High-coupling LNG cold energy ice making process and device | |
| CN212324592U (en) | Water-cooling natural cooling refrigerant direct cooling refrigeration system | |
| CN205783465U (en) | A kind of cooling unit and be provided with the cooling by wind of this cooling unit | |
| CN210267858U (en) | LNG cold energy and exhaust-heat boiler waste heat refrigerated simultaneous cooling system | |
| CN110332746A (en) | A kind of Cold Chain Logistics garden aggregation system based on LNG energy cascade utilization | |
| CN215529686U (en) | Cold water type cold station system | |
| CN210801383U (en) | Solar heat pump energy storage heating system in alpine region | |
| CN210089183U (en) | Device for transferring LNG cold energy by using phase-change refrigerant | |
| CN212431493U (en) | Mixed refrigerant compressor set waste heat utilization and circulating refrigeration device | |
| CN209588438U (en) | Industrial cooling system | |
| CN114739069B (en) | Carbon dioxide ice making system with coupling of multistage heat recovery and multi-mode injection | |
| CN112629069A (en) | Multi-energy complementary LNG cold energy integrated utilization process and device | |
| CN107560129B (en) | Natural gas heating and air conditioner refrigeration coupling system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230317 Address after: 528000 Room 322, 3rd Floor, Building 22, Shunlian Machinery City, No. 18 Xingye 4th Road, Guanglong Industrial Park, Chihua Community, Chencun Town, Shunde District, Foshan City, Guangdong Province (residence application) Patentee after: Foshan huanshengtong New Energy Technology Co.,Ltd. Address before: 510640 No. five, 381 mountain road, Guangzhou, Guangdong, Tianhe District Patentee before: SOUTH CHINA University OF TECHNOLOGY |